On Tue, 21 Mar 2006, David S. Miller wrote:
From: Jesper Dangaard Brouer <[email protected]>
Date: Tue, 21 Mar 2006 15:51:34 +0100 (CET)
You guessed right... I did enable IP_ROUTE_MULTIPATH_CACHED, I have
now disabled it and equal multi path routing in general
(CONFIG_IP_ROUTE_MULTIPATH).
It is almost certainly the cause of your crashes, that code
is still extremely raw and that's why it is listed as "EXPERIMENTAL".
It seems your are right :-) (and I'll take more care of using experimental
code on production again). The machine, has now been running for 34 hours
without crashing. The strange thing is that I'm running the same kernel
on 30 other (similar) machines, which have not crashed. (I do suspect the
specific traffic load pattern to influence this)
BUT, I do think I have noticed another problem in the garbage collection
code (route.c), that causes the garbage collector (almost) never to
garbage collect.
This is caused by the value "ip_rt_max_size" (/proc/sys/net/ipv4/route/max_size)
being set too large. It is set to 16 times the gc_thresh value (this
size dependend on the memory size). In the garbage collection function
(rt_garbage_collect) garbage collecting entries are ignored (gc_ignored)
if the number of entries are below "ip_rt_max_size".
With 1Gb memory, gc_thresh=65536 times 16 is 1048576. Which means that we
only start to garbage collect when there is more than 1 million entries.
This seems wrong... (the reason it does not grow this large is the 600
second periodic flushes).
Hilsen
Jesper Brouer
--
-------------------------------------------------------------------
Cand. scient datalog
Dept. of Computer Science, University of Copenhagen
-------------------------------------------------------------------
grep . /proc/sys/net/ipv4/route/*
/proc/sys/net/ipv4/route/error_burst:5000
/proc/sys/net/ipv4/route/error_cost:1000
grep: /proc/sys/net/ipv4/route/flush: Operation not permitted
/proc/sys/net/ipv4/route/gc_elasticity:8
/proc/sys/net/ipv4/route/gc_interval:60
/proc/sys/net/ipv4/route/gc_min_interval:0
/proc/sys/net/ipv4/route/gc_min_interval_ms:500
/proc/sys/net/ipv4/route/gc_thresh:65536
/proc/sys/net/ipv4/route/gc_timeout:300
/proc/sys/net/ipv4/route/max_delay:10
/proc/sys/net/ipv4/route/max_size:1048576
/proc/sys/net/ipv4/route/min_adv_mss:256
/proc/sys/net/ipv4/route/min_delay:2
/proc/sys/net/ipv4/route/min_pmtu:552
/proc/sys/net/ipv4/route/mtu_expires:600
/proc/sys/net/ipv4/route/redirect_load:20
/proc/sys/net/ipv4/route/redirect_number:9
/proc/sys/net/ipv4/route/redirect_silence:20480
/proc/sys/net/ipv4/route/secret_interval:600
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