Messages in this thread | | | Date | Sun, 3 Jul 2005 22:52:43 -0500 (CDT) | From | Roy Keene <> | Subject | Re: oom-killings, but I'm not out of memory! |
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Howdy,
Roy Keene Planning Systems Inc.
On Sun, 3 Jul 2005, Marcelo Tosatti wrote:
> > Hi Roy, > > On Sun, Jul 03, 2005 at 09:44:37PM -0500, Roy Keene wrote: >> I think I'm having the same issue. >> >> I've 2 systems with 4GB of RAM and 2GB of swap that kill processes when >> they get a lot of disk I/O. I've attached the full dmesg output which >> includes portions where it killed stuff despite having massive amounts of >> free memory. > > What kernel version is that? >
Linux cog2 2.6.9-11.ELsmp #1 SMP Fri May 20 18:26:27 EDT 2005 i686 i686 i386 GNU/Linux
>> oom-killer: gfp_mask=0xd0 >> Mem-info: >> DMA per-cpu: >> cpu 0 hot: low 2, high 6, batch 1 >> cpu 0 cold: low 0, high 2, batch 1 >> cpu 1 hot: low 2, high 6, batch 1 >> cpu 1 cold: low 0, high 2, batch 1 >> cpu 2 hot: low 2, high 6, batch 1 >> cpu 2 cold: low 0, high 2, batch 1 >> cpu 3 hot: low 2, high 6, batch 1 >> cpu 3 cold: low 0, high 2, batch 1 >> Normal per-cpu: >> cpu 0 hot: low 32, high 96, batch 16 >> cpu 0 cold: low 0, high 32, batch 16 >> cpu 1 hot: low 32, high 96, batch 16 >> cpu 1 cold: low 0, high 32, batch 16 >> cpu 2 hot: low 32, high 96, batch 16 >> cpu 2 cold: low 0, high 32, batch 16 >> cpu 3 hot: low 32, high 96, batch 16 >> cpu 3 cold: low 0, high 32, batch 16 >> HighMem per-cpu: >> cpu 0 hot: low 32, high 96, batch 16 >> cpu 0 cold: low 0, high 32, batch 16 >> cpu 1 hot: low 32, high 96, batch 16 >> cpu 1 cold: low 0, high 32, batch 16 >> cpu 2 hot: low 32, high 96, batch 16 >> cpu 2 cold: low 0, high 32, batch 16 >> cpu 3 hot: low 32, high 96, batch 16 >> cpu 3 cold: low 0, high 32, batch 16 >> >> Free pages: 14304kB (1664kB HighMem) >> Active:7971 inactive:994335 dirty:327523 writeback:25721 unstable:0 free:3576 slab:29113 mapped:7996 pagetables:341 > > There are about 100M of writeout data onflight - I suppose thats too much. > > Guess: can you switch to another IO scheduler than CFQ or reduce its queue size? > > IIRC you can do that by reducing /sys/block/device/queue/nr_requests. >
For all the devices I use this is set to 8192
I set "sda" to 512 now.
[root@cog2 ~]# cat /sys/block/{sda,nbd0,nbd1}/queue/nr_requests 8192 8192 8192
>> DMA free:12640kB min:16kB low:32kB high:48kB active:0kB inactive:0kB present:16384kB pages_scanned:877 all_unreclaimable? yes >> protections[]: 0 0 0 >> >> Normal free:0kB min:928kB low:1856kB high:2784kB active:0kB inactive:739100kB present:901120kB pages_scanned:1556742 all_unreclaimable? yes >> protections[]: 0 0 0 > > You've got no reservations for the normal zone either. > > How does /proc/sys/vm/lowmem_reserve_ratio looks like? > >
It looks like it doesn't exist.. [root@cog2 ~]# ls /proc/sys/vm block_dump dirty_ratio laptop_mode max_map_count nr_pdflush_threads page-cluster dirty_background_ratio dirty_writeback_centisecs legacy_va_layout min_free_kbytes overcommit_memory swappiness dirty_expire_centisecs hugetlb_shm_group lower_zone_protection nr_hugepages overcommit_ratio vfs_cache_pressure [root@cog2 ~]# - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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