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SubjectRe: [PATCH] concurrent block allocation for ext2 against 2.5.64
On Fri, Mar 14, 2003 at 10:20:24AM +0300, Alex Tomas wrote:
> and corrected patch:

This patch is a godsend. Whoever's listening, please apply!

dbench on 32x/48G NUMA-Q, aic7xxx adapter, pbay disk, 32K PAGE_SIZE
(pgcl was used for benchmark feasibility purposes)

throughput:
----------
before:
Throughput 61.5376 MB/sec 512 procs
dbench 512 637.21s user 15739.41s system 565% cpu 48:16.28 total

after:
Throughput 104.074 MB/sec 512 procs
(GRR, didn't do time, took ca. 30 minutes)

profile:
--------
before:
vma samples %-age symbol name
c0106ff4 160824916 45.1855 default_idle
c01dbfd0 49993575 14.0462 __copy_to_user_ll
c01dc038 15474349 4.34768 __copy_from_user_ll
c0108140 13603867 3.82215 .text.lock.semaphore
c0119058 10872716 3.0548 try_to_wake_up
c02647f0 7896052 2.21848 sync_buffer
c011a1bc 7539112 2.11819 schedule
c0119dac 7168574 2.01409 scheduler_tick
c011fadc 6053745 1.70086 profile_hook
c0119860 4759523 1.33724 load_balance
c0107d0c 4472105 1.25649 __down
c011c4ff 4159010 1.16852 .text.lock.sched
c013dd28 3026705 0.850385 .text.lock.vmscan
c013ece4 3016788 0.847599 check_highmem_ptes
c0113590 2406329 0.676084 mark_offset_tsc
c02649c0 2210485 0.621059 add_event_entry
c010f6b8 2195748 0.616919 timer_interrupt
c0133118 1696204 0.476566 find_get_page

after:
vma samples %-age symbol name
c0106ff4 52751908 30.8696 default_idle
c01dc3b0 28988721 16.9637 __copy_to_user_ll
c01dc418 8240854 4.82242 __copy_from_user_ll
c011e472 8044716 4.70764 .text.lock.fork
c0264bd0 5666004 3.31566 sync_buffer
c013dd28 4454362 2.60662 .text.lock.vmscan
c0119058 4291999 2.51161 try_to_wake_up
c0119dac 4055412 2.37316 scheduler_tick
c011fadc 3554019 2.07976 profile_hook
c011a1bc 2866025 1.67715 schedule
c0119860 2637644 1.54351 load_balance
c0108140 2433644 1.42413 .text.lock.semaphore
c0264da0 1406704 0.823181 add_event_entry
c011c9a4 1370708 0.802117 prepare_to_wait
c0185e20 1236390 0.723516 ext2_new_block
c011c4ff 1227452 0.718285 .text.lock.sched
c013ece4 1148317 0.671977 check_highmem_ptes
c0113590 1145881 0.670551 mark_offset_tsc


vmstat (short excerpt, edited for readability):
------
before:
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
12 5 38747168 484672 9049088 20 4032 1171 13148 1 22 65 12
11 11 38767264 479168 9034304 20 2908 1180 13077 1 28 52 19
9 14 38764256 480000 9036512 24 1920 1164 13940 1 23 51 25
7 7 38764128 480832 9035360 12 4444 1191 13784 1 24 51 24
9 5 38764512 481664 9033024 16 2924 1220 13853 1 23 66 10
9 6 38762208 482816 9035904 0 3404 1186 13686 1 25 62 12

after:
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
60 11 38659840 533920 9226720 100 1672 2760 1853 5 66 11 18
31 23 38565472 531264 9320384 240 1020 1195 1679 2 35 37 26
23 23 38384928 521952 9503104 772 3372 5624 5093 2 62 9 27
24 31 37945664 518080 9916448 1536 5808 10449 13484 1 45 13 41
31 86 37755072 516096 10091104 1040 1916 3672 9744 2 51 15 32
24 30 37644352 512864 10192960 900 1612 3184 8414 2 49 12 36

There's a lot of odd things going on in both of the vmstat logs.


I've also collected logs of top slab consumers every 10s and full
dbench output for both runs, if that's interesting to anyone.


-- wli
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