2.2.1x kernel memory "leaks"

jlewis@lewis.org
Sun, 5 Aug 2001 23:40:18 -0400 (EDT)

I have a mail relay server that seems to have serious kernel memory leak
issues since upgrading to the later 2.2.1x kernels. Currently, it's
running Red Hat's 2.2.19-6.2.7. What I see is that after a few days,
pretty much all memory is consumed. The majority of it is not being used
by user-space processes. i.e. killing nearly all processes free's up some
memory, but the majority is still tied up by the kernel. I haven't found
much documentation on it, but I suspect the dentry_cache may be to blame.
What's a reasonable size for the dentry_cache?

# uptime
10:30pm up 3 days, 11:14, 1 user, load average: 0.93, 0.63, 0.52

# free
total used free shared buffers cached
Mem: 261668 251968 9700 0 7368 8192
-/+ buffers/cache: 236408 25260
Swap: 264168 13760 250408

# cat /proc/slabinfo
slabinfo - version: 1.0
kmem_cache 29 42
tcp_tw_bucket 128 210
tcp_bind_bucket 80 254
tcp_open_request 3 63
skbuff_head_cache 192 378
sock 100 143
dquot 0 0
filp 1887 1890
signal_queue 0 0
kiobuf 0 0
buffer_head 7517 10038
mm_struct 90 155
vm_area_struct 2224 3276
dentry_cache 1189547 1263374
files_cache 89 126
uid_cache 3 127
size-131072 0 0
size-65536 0 0
size-32768 1 1
size-16384 0 0
size-8192 1 1
size-4096 18 20
size-2048 255 344
size-1024 15 112
size-512 15 24
size-256 515 882
size-128 423 500
size-64 83 84
size-32 3623 4221
slab_cache 115 189

Anyone else run into this or have suggestions?

-- 
----------------------------------------------------------------------
 Jon Lewis *jlewis@lewis.org*|  I route
 System Administrator        |  therefore you are
 Atlantic Net                |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________




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