inode cache, dentry cache, buffer heads usage
From: Badari Pulavarty
Date: Wed Mar 09 2005 - 14:10:50 EST
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 ?
Thanks,
Badari
Meminfo:
========
$ cat /proc/meminfo
MemTotal: 16377076 kB
MemFree: 9400604 kB
Buffers: 577368 kB
Cached: 4002012 kB
SwapCached: 0 kB
Active: 2152196 kB
Inactive: 3578624 kB
HighTotal: 14548952 kB
HighFree: 9387328 kB
LowTotal: 1828124 kB
LowFree: 13276 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 301432 kB
Slab: 1227268 kB
Committed_AS: 695920 kB
PageTables: 5684 kB
VmallocTotal: 114680 kB
VmallocUsed: 312 kB
VmallocChunk: 114368 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 2048 kB
Slabinfo (top users):
=====================
ext3_inode_cache 1405201 1615312 480 8 1 : tunables 54
27 8 : slabdata 201914 201914 0
dentry_cache 1505485 1864917 144 27 1 : tunables 120
60 8 : slabdata 69071 69071 0
buffer_head 1099832 1755375 52 75 1 : tunables 120
60 8 : slabdata 23405 23405 0
radix_tree_node 99919 102522 276 14 1 : tunables 54 27
8 : slabdata 7323 7323 0
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