Re: inode cache, dentry cache, buffer heads usage
From: Badari Pulavarty
Date: Wed Mar 09 2005 - 16:50:04 EST
On Wed, 2005-03-09 at 13:27, Dipankar Sarma wrote:
> On Wed, Mar 09, 2005 at 10:55:58AM -0800, Badari Pulavarty wrote:
> > Hi,
> >
> > We have a 8-way P-III, 16GB RAM running 2.6.8-1. We use this as
> > our server to keep source code, cscopes and do the builds.
> > This machine seems to slow down over the time. One thing we
> > keep noticing is it keeps running out of lowmem. Most of
> > the lowmem is used for ext3 inode cache + dentry cache +
> > bufferheads + Buffers. So we did 2:2 split - but it improved
> > thing, but again run into same issues.
> >
> > So, why is these slab cache are not getting purged/shrinked even
> > under memory pressure ? (I have seen lowmem as low as 6MB). What
> > can I do to keep the machine healthy ?
>
> How does /proc/sys/fs/dentry-state look when you run low on lowmem ?
badari@kernel:~$ cat /proc/sys/fs/dentry-state
1434093 1348947 45 0 0 0
badari@kernel:~$ grep dentry /proc/slabinfo
dentry_cache 1434094 1857519 144 27 1 : tunables 120
60 8 : slabdata 68797 68797 0
badari@kernel:~$ cat /proc/meminfo
MemTotal: 16377076 kB
MemFree: 8343724 kB
Buffers: 579232 kB
Cached: 5051848 kB
SwapCached: 0 kB
Active: 2911084 kB
Inactive: 3878044 kB
HighTotal: 14548952 kB
HighFree: 8330944 kB
LowTotal: 1828124 kB
LowFree: 12780 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 216 kB
Writeback: 0 kB
Mapped: 301940 kB
Slab: 1225772 kB
Committed_AS: 771340 kB
PageTables: 5768 kB
VmallocTotal: 114680 kB
VmallocUsed: 312 kB
VmallocChunk: 114368 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 2048 kB
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