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Subjectext2 performance in 2.5.25 versus 2.4.19pre8aa2
Andrew Morton wanted me to do some benchmarking of large files on ext2 
filesystems rather than the usual block-device testing
i've had some time to do this, here are the results.

one-line summary is that some results are better, some are worse; CPU usage
is better in 2.5.25, but thoughput is sometimes
worse.

Summary:
========

Test #1: create a single large (12GB) file on each disk.
use 12288 blocks of 1048576 bytes each on each of 8 disks.

2.5.25 Wrote 98304MB across 8 files using 96k blocks of 1M in
579.935968s (169.51 MB/sec), 44717usec, ~90% cpu
2.4.19pre8aa2 Wrote 98304MB across 8 files using 96k blocks of 1M in
607.542648s (161.81 MB/sec), 46684usec, ~88% cpu


Test #2: read back from large (12GB) files on each disk.
use 4k reads across 3 million blocks on each of 8 disks:

2.5.25 Read 98304MB across 8 files using 24m blocks of 4k in 508.925829s
(193.16 MB/sec), 158usec mean, ~61% cpu
2.4.19pre8aa2 Read 98304MB across 8 files using 24m blocks of 4k in
526.866882s (186.58 MB/sec), 157usec mean, ~88% cpu


Test #3: same test as #2, but using "nocopy" hack to see if copy_to_user
(memory bandwidth) is the bottleneck.

2.5.25 Read 98304MB across 8 files using 24m blocks of 4k in 507.792229s
(193.59 MB/sec), 160usec mean, ~25% cpu
2.4.19pre8aa2 Read 98304MB across 8 files using 24m blocks of 4k in
511.353691s (192.24 MB/sec), 148usec mean, ~50% cpu


test #4: measure read performance when reads are entirely out of the
page-cache.
test first primes page-cache with data and then issues random
reads from that.
working size is 8 x 200mbyte (1.6GB), test is iterated 10 times.
no I/O is recorded on FC switch, so data is served entirely out
of page cache.

2.5.25 Read 16GB across 8 files using 4096M blocks of 4k in 75.304798s
(212.47 MB/sec), 145usec mean, ~81% cpu
2.4.19pre8aa2 Read 16GB across 8 files using 4096M blocks of 4k in
70.526170s (226.87 MB/sec), 134usec mean, 100% cpu


Test #5: same test as #4, but using "nocopy" hack to see if copy_to_user
(memory bandwidth) is the bottleneck.

2.5.25 Read 16GB across 8 files using 4096M blocks of 4k in 61.694199s
(259.34 MB/sec), 119usec mean, ~65% cpu

** since performance wasn't much higher, i rebooted the machine and loaded
** it with "profile=2" and lockmeter. results of that are at the very end
** of thie email; looks to me like the scheduler was the culplit.

2.4.19pre8aa2 Read 16GB across 8 files using 4096M blocks of 4k in
55.924164s (286.10MB/sec), 108usec mean, ~80% cpu



Details:
========

machine is Dual P3-Xeon, 733MHz processors. 2GB of PC133 SDRAM.
disks are 8 x 15K RPM 18G FC disks, connected to FC switches via 1 x QLogic
FC 2300 HBA @ 2gbit/s.
FC HBA is in a 64/66 PCI slot.

all tests conducted using current in-house test-tool. it uses a
thread-per-device.

8 x empty ext2 filesystems created and mounted

kernels:
- stock 2.3.25 kernel + PAGE_OFFSET modified to 0x80000000 (no highmem),
QLogic FC 2300 HBA +
Andrew Morton's direct-bio patch [not exercised in these benchmarks]



Test #1
-------

create a single large (12GB) file on each disk:
writing to 8 filesystems, using a write block-size of 1 megabyte in
sequential writes.
12288 blocks (12G) per disk, 8 disks is 96GB total.
./test_disk_performance bs=1m blocks=12288 mode=basic operation=write
/mnt/scrap-sd*/bigfile

Linux 2.5.25
Completed writing 98304 mbytes across 8 devices using 98304 blocks of 1048576
in 579.935968 seconds (169.51 Mbytes/sec), 44717usec mean
#0 (/mnt/scrap-sde/bigfile) 12GB in 571.327206s using 12k writes of 1M
(21.51MB/sec), 40876usec
#1 (/mnt/scrap-sdf/bigfile) 12GB in 574.606073s using 12k writes of 1M
(21.39MB/sec), 36949usec
#2 (/mnt/scrap-sdg/bigfile) 12GB in 569.347650s using 12k writes of 1M
(21.58MB/sec), 49047usec
#3 (/mnt/scrap-sdh/bigfile) 12GB in 569.929641s using 12k writes of 1M
(21.56MB/sec), 48534usec
#4 (/mnt/scrap-sdi/bigfile) 12GB in 579.561403s using 12k writes of 1M
(21.20MB/sec), 28629usec
#5 (/mnt/scrap-sdj/bigfile) 12GB in 579.925156s using 12k writes of 1M
(21.19MB/sec), 27282usec
#6 (/mnt/scrap-sdk/bigfile) 12GB in 579.160854s using 12k writes of 1M
(21.22MB/sec), 31282usec
#7 (/mnt/scrap-sdl/bigfile) 12GB in 578.200229s using 12k writes of 1M
(21.25MB/sec), 30292usec

during test, machine had ~10% idle cpu.

Linux 2.4.19pre8aa2
Completed writing 98304 mbytes across 8 devices using 98304 blocks of 1048576
in 607.542648 seconds (161.81 Mbytes/sec), 46684usec mean
#0 (/mnt/scrap-sde/bigfile) 12GB in 603.074257s using 12k writes of 1M
(20.38MB/sec), 37131usec
#1 (/mnt/scrap-sdf/bigfile) 12GB in 606.433219s using 12k writes of 1M
(20.26MB/sec), 25851usec
#2 (/mnt/scrap-sdg/bigfile) 12GB in 603.926881s using 12k writes of 1M
(20.35MB/sec), 43734usec
#3 (/mnt/scrap-sdh/bigfile) 12GB in 603.114330s using 12k writes of 1M
(20.37MB/sec), 39455usec
#4 (/mnt/scrap-sdi/bigfile) 12GB in 604.618177s using 12k writes of 1M
(20.32MB/sec), 43179usec
#5 (/mnt/scrap-sdj/bigfile) 12GB in 597.328666s using 12k writes of 1M
(20.57MB/sec), 40354usec
#6 (/mnt/scrap-sdk/bigfile) 12GB in 590.982972s using 12k writes of 1M
(20.79MB/sec), 44772usec
#7 (/mnt/scrap-sdl/bigfile) 12GB in 607.630086s using 12k writes of 1M
(20.22MB/sec), 22741usec

during test, machine was ~12% idle cpu.


Test #2
-------

read back from large (12GB) files on each disk sequentially using 4k reads
across 3 million blocks:
./test_disk_performance bs=4k blocks=3m mode=basic operation=read
/mnt/scrap-sd*/bigfile


Linux 2.5.25
Completed reading 98304 mbytes across 8 devices using 25165824 blocks of 4096
in 508.925829 seconds (193.16 Mbytes/sec), 158usec mean
#0 (/mnt/scrap-sde/bigfile) 12GB in 505.979550s using 3145728 reads of 4k
(24.29 MB/sec), 160usec
#1 (/mnt/scrap-sdf/bigfile) 12GB in 506.537340s using 3145728 reads of 4k
(24.26 MB/sec), 160usec
#2 (/mnt/scrap-sdg/bigfile) 12GB in 506.582859s using 3145728 reads of 4k
(24.26 MB/sec), 159usec
#3 (/mnt/scrap-sdh/bigfile) 12GB in 507.796716s using 3145728 reads of 4k
(24.20 MB/sec), 152usec
#4 (/mnt/scrap-sdi/bigfile) 12GB in 505.965224s using 3145728 reads of 4k
(24.29 MB/sec), 160usec
#5 (/mnt/scrap-sdj/bigfile) 12GB in 508.235475s using 3145728 reads of 4k
(24.18 MB/sec), 138usec
#6 (/mnt/scrap-sdk/bigfile) 12GB in 508.378988s using 3145728 reads of 4k
(24.17 MB/sec), 137usec
#7 (/mnt/scrap-sdl/bigfile) 12GB in 508.925429s using 3145728 reads of 4k
(24.14 MB/sec), 137usec

during test, machine had approximately 39% idle cpu.
performance is fairly close to FC line-rate -- for interests-sake, test #3
(below)
repeats the test, but using the no-copy hack to see if performance
increases as a
result of reducing the number of memory-copies.

Linux 2.4.19pre8aa2
Completed reading 98304 mbytes across 8 devices using 25165824 blocks of 4096
in 526.866882 seconds (186.58 Mbytes/sec), 157usec mean
#0 (/mnt/scrap-sde/bigfile) 12GB in 496.930413s using 3145728 reads of 4k
(24.73MB/sec), 139usec
#1 (/mnt/scrap-sdf/bigfile) 12GB in 497.684209s using 3145728 reads of 4k
(24.69MB/sec), 134usec
#2 (/mnt/scrap-sdg/bigfile) 12GB in 500.584528s using 3145728 reads of 4k
(24.55MB/sec), 112usec
#3 (/mnt/scrap-sdh/bigfile) 12GB in 526.866829s using 3145728 reads of 4k
(23.32MB/sec), 575usec
#4 (/mnt/scrap-sdi/bigfile) 12GB in 497.065359s using 3145728 reads of 4k
(24.72MB/sec), 137usec
#5 (/mnt/scrap-sdj/bigfile) 12GB in 499.433604s using 3145728 reads of 4k
(24.60MB/sec), 121usec
#6 (/mnt/scrap-sdk/bigfile) 12GB in 506.116496s using 3145728 reads of 4k
(24.28MB/sec), 81usec
#7 (/mnt/scrap-sdl/bigfile) 12GB in 514.755508s using 3145728 reads of 4k
(23.87MB/sec), 80usec

during test, machine had approximately 12% idle cpu.


Test #3
-------

read back from large (12GB) files on each disk sequentially using 4k reads
across 3 million blocks
in order to determine if memory-bandwidth / front-side-bus was the
bottleneck, the kernel was patched with the
bogus "nocopy" read_file_actor hack.
the benchmark as Test #2 was used
./test_disk_performance bs=4k blocks=3m mode=nocopy operation=read
/mnt/scrap-sd*/bigfile

Linux 2.5.25
Completed reading 98304 mbytes across 8 devices using 25165824 blocks of 4096
in 507.792229 seconds (193.59 Mbytes/sec), 160usec mean
#0 (/mnt/scrap-sde/bigfile) 12GB in 507.622831s using 3145728
reads of 4k (24.21 MB/sec), 160usec
#1 (/mnt/scrap-sdf/bigfile) 12GB in 507.543491s using 3145728
reads of 4k (24.21 MB/sec), 159usec
#2 (/mnt/scrap-sdg/bigfile) 12GB in 507.219204s using 3145728
reads of 4k (24.23 MB/sec), 160usec
#3 (/mnt/scrap-sdh/bigfile) 12GB in 507.346622s using 3145728
reads of 4k (24.22 MB/sec), 160usec
#4 (/mnt/scrap-sdi/bigfile) 12GB in 507.739317s using 3145728
reads of 4k (24.20 MB/sec), 160usec
#5 (/mnt/scrap-sdj/bigfile) 12GB in 507.706553s using 3145728
reads of 4k (24.20 MB/sec), 160usec
#6 (/mnt/scrap-sdk/bigfile) 12GB in 507.791357s using 3145728
reads of 4k (24.20 MB/sec), 161usec
#7 (/mnt/scrap-sdl/bigfile) 12GB in 507.791288s using 3145728
reads of 4k (24.20 MB/sec), 160usec

during this test, the machine had ~75% idle cpu and was saturating 2gbit/s FC.
memory-bandwidth / front-side-bus (copy_to_user()) weren't the bottleneck.
the bottleneck in this test was certainly the 2gbit/s FC HBA.

Linux 2.4.19pre8aa2
Completed reading 98304 mbytes across 8 devices using 25165824 blocks of 4096
in 511.353691 seconds (192.24 Mbytes/sec), 148usec mean
#0 (/mnt/scrap-sde/bigfile) 12GB in 501.421399s using 3145728 reads of 4k
(24.51MB/sec), 122usec
#1 (/mnt/scrap-sdf/bigfile) 12GB in 500.688465s using 3145728 reads of 4k
(24.54MB/sec), 128usec
#2 (/mnt/scrap-sdg/bigfile) 12GB in 499.800663s using 3145728 reads of 4k
(24.59MB/sec), 133usec
#3 (/mnt/scrap-sdh/bigfile) 12GB in 505.030670s using 3145728 reads of 4k
(24.33MB/sec), 95usec
#4 (/mnt/scrap-sdi/bigfile) 12GB in 492.732146s using 3145728 reads of 4k
(24.94MB/sec), 156usec
#5 (/mnt/scrap-sdj/bigfile) 12GB in 495.600828s using 3145728 reads of 4k
(24.79MB/sec), 151usec
#6 (/mnt/scrap-sdk/bigfile) 12GB in 504.890322s using 3145728 reads of 4k
(24.34MB/sec), 101usec
#7 (/mnt/scrap-sdl/bigfile) 12GB in 511.353661s using 3145728 reads of 4k
(24.03MB/sec), 80usec

during test, machine cpu was ~50% idle.


Test #4
-------
this test was constructed to show read performance when reads are entirely
out of the page-cache.
randomly read back from a relatively small (200 mbyte) portion of each 12GB
file on each disk spindle. total working size is

8 x 200mbyte (1.6GB), which fits into the page-cache.

firstly, "prime" the page-cache:
./test_disk_performance bs=4k blocks=50k mode=basic operation=read
/mnt/scrap-sd*/bigfile

secondly, randomly seek-once-per-block for 50k blocks of 4k into the file
(i.e. working-set is 200mbyte on each file).
iterate the test 10 times.
./test_disk_performance bs=4k blocks=50k mode=basic operation=read
seek=random iterations=10 /mnt/scrap-sd*/bigfile

Linux 2.5.25
Completed reading 16000 mbytes across 8 devices using 4096000 blocks of 4096
in 75.304798 seconds (212.47 Mbytes/sec), 145usec mean
#0 (/mnt/scrap-sde/bigfile) 2GB in 75.304670s using 512K reads of
4k (26.56 MB/sec), 144usec
#1 (/mnt/scrap-sdf/bigfile) 2GB in 75.201499s using 512K reads of
4k (26.60 MB/sec), 144usec
#2 (/mnt/scrap-sdg/bigfile) 2GB in 75.260114s using 512K reads of
4k (26.57 MB/sec), 144usec
#3 (/mnt/scrap-sdh/bigfile) 2GB in 75.287700s using 512K reads of
4k (26.56 MB/sec), 146usec
#4 (/mnt/scrap-sdi/bigfile) 2GB in 75.298464s using 512K reads of
4k (26.56 MB/sec), 144usec
#5 (/mnt/scrap-sdj/bigfile) 2GB in 75.203990s using 512K reads of
4k (26.59 MB/sec), 144usec
#6 (/mnt/scrap-sdk/bigfile) 2GB in 75.204889s using 512K reads of
4k (26.59 MB/sec), 145usec
#7 (/mnt/scrap-sdl/bigfile) 2GB in 74.981378s using 512K reads of
4k (26.67 MB/sec), 144usec

during this test, there was zero activity on the FC switching infrastructure,
so all i/o was served from the page-cache.
cpu during the test was ~19% idle.

since there was so much idle time, my guess is that the system had hit its
peak
memory-bandwidth. test #5 (below) proves that this is the case.

Linux 2.4.19pre8aa2
Completed reading 16000 mbytes across 8 devices using 4096000 blocks of 4096
in 70.526170 seconds (226.87 Mbytes/sec), 134usec mean
#0 (/mnt/scrap-sde/bigfile) 2GB in 70.321070s using 512K reads of 4k
(28.44 MB/sec), 135usec
#1 (/mnt/scrap-sdf/bigfile) 2GB in 69.913954s using 512K reads of 4k
(28.61 MB/sec), 135usec
#2 (/mnt/scrap-sdg/bigfile) 2GB in 70.449511s using 512K reads of 4k
(28.39 MB/sec), 133usec
#3 (/mnt/scrap-sdh/bigfile) 2GB in 70.467109s using 512K reads of 4k
(28.38 MB/sec), 134usec
#4 (/mnt/scrap-sdi/bigfile) 2GB in 70.491946s using 512K reads of 4k
(28.37 MB/sec), 133usec
#5 (/mnt/scrap-sdj/bigfile) 2GB in 70.350087s using 512K reads of 4k
(28.43 MB/sec), 133usec
#6 (/mnt/scrap-sdk/bigfile) 2GB in 70.496071s using 512K reads of 4k
(28.37 MB/sec), 134usec
#7 (/mnt/scrap-sdl/bigfile) 2GB in 70.526164s using 512K reads of 4k
(28.36 MB/sec), 134usec

cpu was 0% idle during test.


Test #5
-------
randomly read back from a relatively small (200 mbyte) portion of each 12GB
file on each disk spindle. total working size is

8 x 200mbyte (1.6GB), which fits into the page-cache.

in order to determine if memory-bandwidth / front-side-bus was the
bottleneck, the 2.5.25 kernel was patched with the
bogus "nocopy" read_file_actor hack.
the same methodology in test #4 was used:
prime the page-cache with
./test_disk_performance bs=4k blocks=50k mode=basic operation=read
/mnt/scrap-sd*/bigfile
secondly, randomly seek-once-per-block for 50k blocks of 4k into the file
(i.e. working-set is 200mbyte on each file).
iterate the test 10 times.
./test_disk_performance bs=4k blocks=50k mode=nocopy operation=read
seek=random iterations=10 /mnt/scrap-sd*/bigfile


Linux 2.5.25
Completed reading 16000 mbytes across 8 devices using 4096000 blocks of 4096
in 61.694199 seconds (259.34 Mbytes/sec), 119usec mean
#0 (/mnt/scrap-sde/bigfile) 2GB in 61.639063s using 512K reads of
4k (32.45 MB/sec), 119usec
#1 (/mnt/scrap-sdf/bigfile) 2GB in 61.684894s using 512K reads of
4k (32.42 MB/sec), 119usec
#2 (/mnt/scrap-sdg/bigfile) 2GB in 61.693891s using 512K reads of
4k (32.42 MB/sec), 119usec
#3 (/mnt/scrap-sdh/bigfile) 2GB in 61.647535s using 512K reads of
4k (32.44 MB/sec), 119usec
#4 (/mnt/scrap-sdi/bigfile) 2GB in 61.653856s using 512K reads of
4k (32.44 MB/sec), 119usec
#5 (/mnt/scrap-sdj/bigfile) 2GB in 61.642686s using 512K reads of
4k (32.45 MB/sec), 119usec
#6 (/mnt/scrap-sdk/bigfile) 2GB in 61.638954s using 512K reads of
4k (32.45 MB/sec), 119usec
#7 (/mnt/scrap-sdl/bigfile) 2GB in 61.639063s using 512K reads of
4k (32.45 MB/sec), 119usec

this time, cpu was ~35% idle, yet performance didn't improve significantly.
because of this, i compiled a kernel with lockmeter forward-ported to 2.5.25
and rebooted with "profile=2".

Linux 2.4.19pre8aa2
Completed reading 16000 mbytes across 8 devices using 4096000 blocks of 4096
in 55.924164 seconds (286.10 Mbytes/sec), 108usec mean
#0 (/mnt/scrap-sde/bigfile) 2GB in 55.919840s using 512K reads of 4k
(35.77 MB/sec), 107usec
#1 (/mnt/scrap-sdf/bigfile) 2GB in 55.921253s using 512K reads of 4k
(35.76 MB/sec), 108usec
#2 (/mnt/scrap-sdg/bigfile) 2GB in 55.923975s using 512K reads of 4k
(35.76 MB/sec), 108usec
#3 (/mnt/scrap-sdh/bigfile) 2GB in 55.900788s using 512K reads of 4k
(35.78 MB/sec), 108usec
#4 (/mnt/scrap-sdi/bigfile) 2GB in 55.910989s using 512K reads of 4k
(35.77 MB/sec), 108usec
#5 (/mnt/scrap-sdj/bigfile) 2GB in 55.903394s using 512K reads of 4k
(35.78 MB/sec), 107usec
#6 (/mnt/scrap-sdk/bigfile) 2GB in 55.868038s using 512K reads of 4k
(35.80 MB/sec), 108usec
#7 (/mnt/scrap-sdl/bigfile) 2GB in 55.895071s using 512K reads of 4k
(35.78 MB/sec), 108usec

during test, cpu was ~20% idle.

Test #5 of 2.5.25 kernel with lockmeter & profile=2
---------------------------------------------------

using profile=2 and lockmeter on test #5:

given performance wasn't significantly higher (it should have been), i
rebooted the machine, and loaded 2.5.25 with
"profile=2" and patched in lockmeter.

the same benchmark in test #5 was executed as follows:
readprofile -r; ./lockstat/lockstat on; ./lockstat/lockstat reset;
./test_disk_performance3 bs=4k blocks=50k

mode=nocopy operation=read seek=random iterations=10
/mnt/scrap-sd*/bigfile; readprofile -v | sort -n -k4 | tail -20;

./lockstat/lockstat print

the results were very odd -- i've removed all locks with 0% contention.
the contention seems to be in the scheduler:

Completed reading 16000 mbytes across 8 devices using 4096000 blocks of
4096 in 91.014923 seconds (175.80 Mbytes/sec),

175usec mean
#0 (/mnt/scrap-sde/bigfile) 2000MB in 91.014743s using 512000
reads of 4096 bytes (21.97 Mbytes/sec), 139usec
#1 (/mnt/scrap-sdf/bigfile) 2000MB in 90.945358s using 512000
reads of 4096 bytes (21.99 Mbytes/sec), 178usec
#2 (/mnt/scrap-sdg/bigfile) 2000MB in 90.430662s using 512000
reads of 4096 bytes (22.12 Mbytes/sec), 174usec
#3 (/mnt/scrap-sdh/bigfile) 2000MB in 90.474412s using 512000
reads of 4096 bytes (22.11 Mbytes/sec), 174usec
#4 (/mnt/scrap-sdi/bigfile) 2000MB in 90.443735s using 512000
reads of 4096 bytes (22.11 Mbytes/sec), 174usec
#5 (/mnt/scrap-sdj/bigfile) 2000MB in 90.494653s using 512000
reads of 4096 bytes (22.10 Mbytes/sec), 174usec
#6 (/mnt/scrap-sdk/bigfile) 2000MB in 90.488251s using 512000
reads of 4096 bytes (22.10 Mbytes/sec), 174usec
#7 (/mnt/scrap-sdl/bigfile) 2000MB in 90.620444s using 512000
reads of 4096 bytes (22.07 Mbytes/sec), 174usec
80108938 resume_userspace 59 3.6875
8011b540 sys_gettimeofday 729 4.5563
80108650 handle_signal 1963 5.5767
801087b0 do_signal 1046 5.9432
80107a20 sys_rt_sigsuspend 2058 6.1250
80107dd0 sys_sigreturn 1984 6.5263
80108974 syscall_call 73 6.6364
8010a3f0 math_state_restore 450 7.0312
8010f140 restore_i387 3040 7.0370
8011bc40 do_softirq 1473 7.0817
8010ef10 save_i387 4281 7.6446
80120ab0 get_signal_to_deliver 5523 10.7871
80113ba0 schedule 10230 10.8369
8010ed80 restore_fpu 475 14.8438
80109418 device_not_available 787 16.3958
8010897f syscall_exit 203 18.4545
8010de50 do_gettimeofday 7115 49.4097
80120440 send_sig_info 9599 54.5398
80108948 system_call 5549 126.1136
80106d30 default_idle 52095 813.9844


lockstat results -- all contended locks shown:

___________________________________________________________________________________________
System: Linux mel-stglab-host1 2.5.25 #12 SMP Sun Jul 14 19:25:43 EST 2002 i686
Total counts

All (32) CPUs

Start time: Sun Jul 14 20:06:07 2002
End time: Sun Jul 14 20:11:46 2002
Delta Time: 338.84 sec.
Hash table slots in use: 432.
Global read lock slots in use: 999.


- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - -
SPINLOCKS HOLD WAIT
UTIL CON MEAN( MAX ) MEAN( MAX )(% CPU) TOTAL NOWAIT SPIN
RJECT NAME

1.2% 0.7us(3768us) 1.7us( 286us)(0.02%) 88382474 98.8% 1.1%
0.02% *TOTAL*


0.03% 0.20% 1.6us( 7.5us) 2.6us( 12us)(0.00%) 61102 99.8%
0.20% 0% [0xf7b1c008]
0.03% 0.11% 3.2us( 7.5us) 2.1us( 4.9us)(0.00%) 30551 99.9%
0.11% 0% qla2x00_done+0x1e8
0.00% 0.30% 0.1us( 0.6us) 2.7us( 12us)(0.00%) 30551 99.7%
0.30% 0% qla2x00_queuecommand+0x484

0.01% 0.03% 0.2us( 1.1us) 0.9us( 2.2us)(0.00%) 244002 100%
0.03% 0% [0xf7b1e35c]
0.00% 0.02% 0.1us( 0.6us) 0.9us( 1.2us)(0.00%) 30551 100%
0.02% 0% qla2x00_callback+0x54
0.00% 0.02% 0.2us( 0.7us) 1.1us( 1.9us)(0.00%) 30145 100%
0.02% 0% qla2x00_done+0x34
0.00% 0.03% 0.2us( 1.1us) 0.7us( 0.9us)(0.00%) 30551 100%
0.03% 0% qla2x00_get_new_sp+0x18
0.00% 0.02% 0.2us( 1.1us) 1.2us( 1.9us)(0.00%) 61102 100%
0.02% 0% qla2x00_next+0x20
0.00% 0.06% 0.1us( 0.9us) 0.8us( 1.6us)(0.00%) 30551 100%
0.06% 0% qla2x00_next+0x10c
0.00% 0.05% 0.1us( 0.5us) 0.9us( 1.7us)(0.00%) 30551 100%
0.05% 0% qla2x00_queuecommand+0x424
0.00% 0.03% 0.2us( 0.9us) 1.1us( 2.2us)(0.00%) 30551 100%
0.03% 0% qla2x00_status_entry+0x830

0.06% 0.06% 3.4us( 11us) 2.8us( 5.3us)(0.00%) 60704 100%
0.06% 0% [0xf7b1e388]
0.02% 0.10% 2.2us( 8.0us) 3.0us( 5.3us)(0.00%) 30551 100%
0.10% 0% qla2x00_64bit_start_scsi+0x15c
0.00% 0% 0.3us(
0.4us) 0us 8 100% 0% 0%
qla2x00_cmd_timeout+0x190
0.04% 0.02% 4.7us( 11us) 2.2us( 3.0us)(0.00%) 30145 100%
0.02% 0% qla2x00_intr_handler+0x40

0.26% 0.04% 0.1us( 1.0us) 0.6us( 1.5us)(0.00%) 8927899 100%
0.04% 0% blk_plug_lock
0.00% 0.01% 0.1us( 0.8us) 0.3us( 0.4us)(0.00%) 28901 100%
0.01% 0% blk_plug_device+0x1c
0.26% 0.04% 0.1us( 1.0us) 0.6us( 1.5us)(0.00%) 8870097 100%
0.04% 0% blk_run_queues+0x18
0.00% 1.0% 0.1us( 0.5us) 0.6us( 1.1us)(0.00%) 28901
99.0% 1.0% 0% generic_unplug_device+0x2c

0.03% 0.05% 0.5us( 9.2us) 1.2us( 3.0us)(0.00%) 158705 100%
0.05% 0% contig_page_data+0xb4
0.00% 0.12% 0.2us( 3.0us) 1.3us( 2.0us)(0.00%) 27794 99.9%
0.12% 0% __free_pages_ok+0x174
0.02% 0.03% 0.6us( 9.2us) 1.1us( 3.0us)(0.00%) 130911 100%
0.03% 0% rmqueue+0x28

0.01% 0.03% 1.5us( 44us) 5.6us( 12us)(0.00%) 23127 100%
0.03% 0% dcache_lock
0.00% 0.04% 0.3us( 6.4us) 4.0us( 6.5us)(0.00%) 7053 100%
0.04% 0% dput+0x30
0.01% 0.04% 3.8us( 44us) 7.1us( 12us)(0.00%) 7114 100%
0.04% 0% path_lookup+0xd8

0.00% 0.01% 0.3us( 28us) 0.3us( 0.3us)(0.00%) 13515 100%
0.01% 0% files_lock
0.00% 0.02% 0.2us( 28us) 0.3us( 0.3us)(0.00%) 4489 100%
0.02% 0% __fput+0x70

0.18% 0.02% 1.7us( 4.8us) 1.7us( 3.3us)(0.00%) 367354 100%
0.02% 0% ioapic_lock
0.18% 0.02% 1.7us( 4.8us) 1.7us( 3.3us)(0.00%) 367354 100%
0.02% 0% set_ioapic_affinity+0x20

0.02% 2.7% 9.3us( 306us) 14us( 286us)(0.00%) 7358
97.3% 2.7% 0% kernel_flag
0.00% 0.28% 0.4us( 4.1us) 15us( 15us)(0.00%) 351 99.7%
0.28% 0% de_put+0x2c
0.00% 0.88% 21us( 97us) 15us( 21us)(0.00%) 342 99.1%
0.88% 0% ext3_dirty_inode+0x2c
0.00% 0.50% 2.0us( 70us) 24us( 24us)(0.00%) 202 99.5%
0.50% 0% ext3_get_block_handle+0xb8
0.00% 2.9% 4.9us( 7.0us) 146us( 146us)(0.00%) 35
97.1% 2.9% 0% ext3_write_super+0x24
0.00% 27.0% 52us( 306us) 29us( 286us)(0.00%) 226 73.0%
27.0% 0% schedule+0x394
0.00% 0.79% 0.7us( 1.2us) 9.2us( 14us)(0.00%) 379 99.2%
0.79% 0% sem_exit+0x24
0.00% 0.83% 2.4us( 21us) 5.3us( 8.5us)(0.00%) 845 99.2%
0.83% 0% sys_ioctl+0x44
0.00% 12.0% 6.7us( 36us) 4.2us( 12us)(0.00%) 502 88.0%
12.0% 0% tty_read+0xc4
0.01% 3.2% 8.8us( 53us) 6.2us( 25us)(0.00%) 2004
96.8% 3.2% 0% tty_write+0x1f4

0.02% 0.01% 0.2us( 37us) 3.3us( 16us)(0.00%) 247810 100%
0.01% 0% pagemap_lru_lock
0.01% 0.00% 0.4us( 36us) 14us( 16us)(0.00%) 102714 100%
0.00% 0% activate_page+0xc
0.01% 0.01% 0.1us( 31us) 0.6us( 1.0us)(0.00%) 124041 100%
0.01% 0% lru_cache_add+0x1c
0.00% 0.01% 0.2us( 30us) 0.9us( 0.9us)(0.00%) 21044 100%
0.01% 0% lru_cache_del+0xc

0.00% 83.2% 0.6us( 2.2us) 1.0us( 2.4us)(0.00%) 7652 16.8%
83.2% 0% runqueues
0.00% 83.2% 0.6us( 2.2us) 1.0us( 2.4us)(0.00%) 7652 16.8%
83.2% 0% load_balance+0x13c

0.00% 42.6% 0.8us( 4.2us) 1.0us( 3.0us)(0.00%) 15467 57.4%
42.6% 0% runqueues+0x9a0
0.00% 84.3% 0.4us( 1.9us) 1.0us( 3.0us)(0.00%) 7815 15.7%
84.3% 0% load_balance+0x188

0.05% 0.02% 0.3us( 4.0us) 0.8us( 2.5us)(0.00%) 560160 100%
0.02% 0% timerlist_lock
0.01% 0.04% 0.2us( 1.6us) 0.8us( 1.4us)(0.00%) 93886 100%
0.04% 0% add_timer+0x10
0.00% 0.05% 0.1us( 0.7us) 0.8us( 2.5us)(0.00%) 61444 100%
0.05% 0% del_timer+0x14
0.00% 0.02% 0.2us( 0.9us) 0.8us( 1.3us)(0.00%) 32154 100%
0.02% 0% del_timer_sync+0x1c
0.00% 0.46% 0.5us( 1.6us) 0.6us( 0.7us)(0.00%) 647 99.5%
0.46% 0% mod_timer+0x18
0.03% 0.01% 0.3us( 4.0us) 0.8us( 1.2us)(0.00%) 339146 100%
0.01% 0% timer_bh+0xd4
0.00% 0.01% 0.1us( 0.8us) 0.9us( 1.0us)(0.00%) 32883 100%
0.01% 0% timer_bh+0x274

0.04% 0.36% 3.8us( 12us) 3.2us( 14us)(0.00%) 31764 99.6%
0.36% 0% __make_request+0x70
0.07% 0.10% 7.5us( 44us) 2.5us( 4.5us)(0.00%) 30805 100%
0.10% 0% __scsi_end_request+0x20
0.01% 0.00% 0.6us( 6.9us) 0.5us( 0.8us)(0.00%) 81580 100%
0.00% 0% __wake_up+0x20
0.00% 0.29% 7.7us( 68us) 4.8us( 4.8us)(0.00%) 348 99.7%
0.29% 0% ahc_linux_isr+0x28
0.03% 1.3% 3.2us( 12us) 1.5us( 9.2us)(0.00%) 28915
98.7% 1.3% 0% generic_unplug_device+0x14
0.31% 1.2% 0.8us( 3.7us) 0us 1321702
98.8% 0% 1.2% load_balance+0x120
0.00% 0.59% 0.2us( 0.8us) 1.1us( 1.8us)(0.00%) 1525 99.4%
0.59% 0% n_tty_chars_in_buffer+0x18
0.00% 0.40% 0.1us( 0.5us) 0.6us( 0.6us)(0.00%) 501 99.6%
0.40% 0% read_chan+0x538
0.00% 0.60% 0.1us( 0.2us) 0.9us( 1.2us)(0.00%) 501 99.4%
0.60% 0% read_chan+0x59c
0.00% 0.02% 0.1us( 0.7us) 0.8us( 1.2us)(0.00%) 28530 100%
0.02% 0% remove_wait_queue+0x10
5.2% 3.0% 1.5us( 13us) 1.1us( 3.2us)(0.00%) 11473908
97.0% 3.0% 0% schedule+0x8c
0.02% 1.6% 0.2us( 5.3us) 1.0us( 2.6us)(0.00%) 308882
98.4% 1.6% 0% scheduler_tick+0x10c
0.08% 0.88% 0.8us( 4.7us) 1.0us( 2.2us)(0.00%) 369477 99.1%
0.88% 0% scheduler_tick+0x80
0.00% 0.45% 0.2us( 13us) 2.7us( 7.7us)(0.00%) 30819 99.5%
0.45% 0% scsi_dispatch_cmd+0x138
0.00% 0.21% 0.2us( 1.0us) 2.4us( 5.6us)(0.00%) 30819 99.8%
0.21% 0% scsi_finish_command+0x18
0.00% 0.22% 0.5us( 3.2us) 2.7us( 6.4us)(0.00%) 30819 99.8%
0.22% 0% scsi_queue_next_request+0x18
0.00% 0.08% 0.3us( 4.0us) 5.1us( 18us)(0.00%) 30819 100%
0.08% 0% scsi_request_fn+0x3bc
5.2% 0.00% 2.0us( 12us) 0.7us( 1.0us)(0.00%) 8750674 100%
0.00% 0% send_sig_info+0x4c
0.00% 0.93% 0.8us( 1.9us) 0.2us( 0.2us)(0.00%) 108 99.1%
0.93% 0% sys_sched_yield+0x38
1.6% 7.3% 0.6us( 4.8us) 2.0us( 6.7us)(0.01%) 8758669
92.7% 7.3% 0% try_to_wake_up+0x40
0.00% 0.26% 0.7us( 2.0us) 0.3us( 0.3us)(0.00%) 379 99.7%
0.26% 0% wake_up_forked_process+0x30

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - -
RWLOCK READS HOLD MAX RDR BUSY PERIOD WAIT
UTIL CON MEAN RDRS MEAN( MAX ) MEAN( MAX )( %CPU) TOTAL
NOWAIT SPIN NAME

0.14% 4.7us( 13us)(0.00%) 60230957
99.9% 0.14% *TOTAL*

7.3% 0.00% 2.8us 2 2.8us( 245us) 3.1us(
9.0us)(0.00%) 8751481 100% 0.00% tasklist_lock
0.26% 2.6us( 2.6us)(0.00%) 379
99.7% 0.26% exit_notify+0x18
11.1% 2.6us( 2.6us)(0.00%) 9
88.9% 11.1% sig_exit+0x90

1.4% 0.44% 0.2us 2 0.3us( 3.3us) 4.7us( 13us)(0.00%) 19266661
99.6% 0.44% xtime_lock
0.44% 4.7us( 13us)(0.00%) 19266661
99.6% 0.44% do_gettimeofday+0x14

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
RWLOCK WRITES HOLD WAIT (ALL) WAIT (WW)
UTIL CON MEAN( MAX ) MEAN( MAX )( %CPU) MEAN( MAX ) TOTAL
NOWAIT SPIN( WW ) NAME

0.13% 0.7us( 230us) 1.0us( 9.0us)(0.00%) 0.3us( 2.9us) 10490234
99.9% 0.09%(0.05%) *TOTAL*

0.00% 7.8% 0.5us( 3.0us) 1.8us( 9.0us)(0.00%) 0.7us( 2.9us) 1224
92.2% 6.7%( 1.1%) tasklist_lock
0.00% 7.7% 0.7us( 1.3us) 1.6us( 7.4us)(0.00%) 0.3us( 0.7us) 379
92.3% 6.3%( 1.3%) do_fork+0x588
0% 7.1% 2.0us( 3.1us)(0.00%) 1.5us( 2.9us) 379
92.9% 5.8%( 1.3%) exit_notify+0x1c4
0.00% 4.6% 0.1us( 0.1us) 1.4us( 1.7us)(0.00%) 0.6us( 0.6us) 87
95.4% 3.4%( 1.1%) pid_base_iput+0x18
0.00% 9.5% 0.8us( 3.0us) 1.8us( 9.0us)(0.00%) 0.2us( 0.6us) 379
90.5% 8.7%(0.79%) unhash_process+0x14

1.0% 2.1% 5.2us( 18us) 1.0us( 2.3us)(0.00%) 0.3us( 1.2us) 678292
97.9% 1.3%(0.74%) xtime_lock
0.04% 2.1% 0.4us( 4.8us) 1.0us( 2.3us)(0.00%) 0.3us( 1.2us) 339146
97.9% 1.3%(0.81%) timer_bh+0xc
1.0% 2.0% 10us( 18us) 0.9us( 2.2us)(0.00%) 0.3us( 0.9us) 339146
98.0% 1.3%(0.68%) timer_interrupt+0x10

1.1% 0% 0.4us(
230us) 0us 0us 9604614 100% 0%( 0%)
do_generic_file_read+0x8c

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