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Subject2.4.14 SMP Buffers/Cache reporting problem
Kernel Versions 2.4.13, 2.4.14 both SMP
ext3 patch versions ext3-2.4-0.9.15-2414, ext3-2.4-0.9.13-2413p6
Red Hat e1000 patch (not used on this machine)

2.4.14 has the loop patch to remove the 2 deactivate_page() calls.

System is a Dell 4300, dual 450, 1G RAM. 2xeepro100. Megaraid with 3-9G
drives on raid5.

Ok, the problem is that after heavy workload with ext3, buffers and cache go
completely and utterly insane...

Output relates to 2.4.14 with ext3-2.4-0.9.15-2414, loop-patch, and e1000
patch from 2.4.7 (redhat).

We are in need to get a production system off 2.4.13. Is this one a show
stopper?

Regards
James Bourne

---------------------------

# cat /proc/meminfo
total: used: free: shared: buffers: cached:
Mem: 1054720000 210366464 844353536 0 169832448 18446744073561239552
Swap: 2147467264 0 2147467264
MemTotal: 1030000 kB
MemFree: 824564 kB
MemShared: 0 kB
Buffers: 165852 kB
Cached: 4294822460 kB
SwapCached: 0 kB
Active: 166492 kB
Inactive: 18604 kB
HighTotal: 131064 kB
HighFree: 2968 kB
LowTotal: 898936 kB
LowFree: 821596 kB
SwapTotal: 2097136 kB
SwapFree: 2097136 kB

******** Alt-Sysrq output ********
Nov 6 14:54:39 test-10-2 kernel: SysRq : Show Memory
Nov 6 14:54:39 test-10-2 kernel: Mem-info:
Nov 6 14:54:39 test-10-2 kernel: Free pages: 823460kB ( 2068kB HighMem)
Nov 6 14:54:39 test-10-2 kernel: Zone:DMA freepages: 14148kB min: 512kB low: 1024kB high: 1536kB
Nov 6 14:54:39 test-10-2 kernel: Zone:Normal freepages:807244kB min: 1020kB low: 2040kB high: 3060kB
Nov 6 14:54:39 test-10-2 kernel: Zone:HighMem freepages: 2068kB min: 1020kB low: 2040kB high: 3060kB
Nov 6 14:54:39 test-10-2 kernel: ( Active: 41679, inactive: 4892, free: 205865 )
Nov 6 14:54:39 test-10-2 kernel: 1*4kB 2*8kB 3*16kB 2*32kB 1*64kB 3*128kB 1*256kB 0*512kB 1*1024kB 6*2048kB = 14148kB)
Nov 6 14:54:39 test-10-2 kernel: 1*4kB 19*8kB 101*16kB 95*32kB 170*64kB 132*128kB 0*256kB 1*512kB 0*1024kB 378*2048kB = 807244kB)
Nov 6 14:54:39 test-10-2 kernel: 5*4kB 2*8kB 1*16kB 1*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB = 2068kB)
Nov 6 14:54:39 test-10-2 kernel: Swap cache: add 0, delete 0, find 0/0, race 0+0
Nov 6 14:54:39 test-10-2 kernel: Free swap: 2097136kB
Nov 6 14:54:39 test-10-2 kernel: 262142 pages of RAM
Nov 6 14:54:39 test-10-2 kernel: 32766 pages of HIGHMEM
Nov 6 14:54:39 test-10-2 kernel: 4642 reserved pages
Nov 6 14:54:39 test-10-2 kernel: 10659 pages shared
Nov 6 14:54:39 test-10-2 kernel: 0 pages swap cached
Nov 6 14:54:39 test-10-2 kernel: 32 pages in page table cache
Nov 6 14:54:39 test-10-2 kernel: Buffer memory: 166088kB
Nov 6 14:54:39 test-10-2 kernel: CLEAN: 40843 buffers, 162478 kbyte, 43 used (last=40737), 0 locked, 0 dirty
Nov 6 14:54:39 test-10-2 kernel: LOCKED: 2 buffers, 8 kbyte, 1 used (last=1), 0 locked, 1 dirty
Nov 6 14:54:39 test-10-2 kernel: DIRTY: 13 buffers, 40 kbyte, 13 used (last=13), 0 locked, 13 dirty
Nov 6 14:54:44 test-10-2 kernel: SysRq : Show Regs
Nov 6 14:54:44 test-10-2 kernel:
Nov 6 14:54:44 test-10-2 kernel: Pid: 0, comm: swapper
Nov 6 14:54:44 test-10-2 kernel: EIP: 0010:[default_idle+44/64] CPU: 0 EFLAGS: 00000246 Not tainted
Nov 6 14:54:44 test-10-2 kernel: EIP: 0010:[<c010520c>] CPU: 0 EFLAGS: 00000246 Not tainted
Nov 6 14:54:44 test-10-2 kernel: EAX: 00000000 EBX: c01051e0 ECX: 00000032 EDX: c0258000
Nov 6 14:54:44 test-10-2 kernel: ESI: c0258000 EDI: c0258000 EBP: c01051e0 DS: 0018 ES: 0018
Nov 6 14:54:44 test-10-2 kernel: CR0: 8005003b CR2: 080c9f9c CR3: 37867000 CR4: 000006d0
Nov 6 14:54:44 test-10-2 kernel: Call Trace: [cpu_idle+82/112] [_stext+0/64]
Nov 6 14:54:44 test-10-2 kernel: Call Trace: [<c0105292>] [<c0105000>]

******** Test Output ********

Script started on Tue Nov 6 14:35:22 2001
[root@thissystem]# cd bar
[root@thissystem]# free
total used free shared buffers cached
Mem: 1030000 37564 992436 0 5032 13712
-/+ buffers/cache: 18820 1011180
Swap: 2097136 0 2097136

[root@thissystem]# ls
[root@thissystem]# let j=0 ; while [ $j -lt 10 ] ; do let j=$j+1 ; for i in 1
2 3 4 5 6 7 8 9 0 ; do dd if=/dev/zero of=$i.file bs=1024k count=10 ; done ; for
r i in 1 2 3 4 5 6 7 8 9 0 ; do cat $i.file > /dev/null ; done ; for i in 1 2 3 4
4 5 6 7 8 9 0 ; do rm -f $i.file ; done ; sync ; done
10+0 records in
10+0 records out
10+0 records in
10+0 records out
10+0 records in
10+0 records out
...
10+0 records in
10+0 records out
10+0 records in
10+0 records in
10+0 records out
10+0 records in
10+0 records out
10+0 records in
10+0 records out

[root@test-10-2]# free
total used free shared buffers cached
Mem: 1030000 226036 803964 0 165192 4294842208
-/+ buffers/cache: -4294781364 4295811364
Swap: 2097136 0 2097136
[root@test-10-2]# procinfo
Linux 2.4.14-1 (root@odin) (gcc 2.96 20000731 ) #1 2CPU [test-10-2.(none)]

Memory: Total Used Free Shared Buffers Cached
Mem: 1030000 226100 803900 0 165232 -125088
Swap: 2097136 0 2097136

Bootup: Tue Nov 6 14:33:35 2001 Load average: 1.54 0.72 0.27 1/47 1168

user : 0:00:05.74 1.3% page in : 14970 disk 1: 1717r 3892w
nice : 0:00:00.00 0.0% page out: 225213
system: 0:00:21.22 5.0% swap in : 1
idle : 0:06:37.36 93.6% swap out: 0
uptime: 0:03:32.15 context : 20888

irq 0: 21216 timer irq 12: 6
irq 1: 3 keyboard irq 16: 35 aic7xxx, aic7xxx
irq 2: 0 cascade [4] irq 18: 5620 megaraid
irq 6: 7 irq 21: 3305 eth0
irq 8: 1 rtc

[root@test-10-2]# cat /proc/meminfo
total: used: free: shared: buffers: cached:
Mem: 1054720000 231538688 823181312 0 169218048 18446744073581461504
Swap: 2147467264 0 2147467264
MemTotal: 1030000 kB
MemFree: 803888 kB
MemShared: 0 kB
Buffers: 165252 kB
Cached: 4294842208 kB
SwapCached: 0 kB
Active: 186480 kB
Inactive: 19308 kB
HighTotal: 131064 kB
HighFree: 2156 kB
LowTotal: 898936 kB
LowFree: 801732 kB
SwapTotal: 2097136 kB
SwapFree: 2097136 kB
[root@test-10-2]# exit
exit

Script done on Tue Nov 6 14:37:27 2001



--
James Bourne, Supervisor Data Centre Operations
Mount Royal College, Calgary, AB, CA
www.mtroyal.ab.ca

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