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Re: TCP: time wait bucket table overflow [message #25452 is a reply to message #25441] Wed, 26 December 2007 09:07 Go to previous messageGo to previous message
vaverin is currently offline  vaverin
Messages: 708
Registered: September 2005
Senior Member
these messages are printed in tcp_time_wait() function
http://git.openvz.org/?p=linux-2.6.18-openvz;a=blob;f=net/ip v4/tcp_minisocks.c;h=e280537ef09aa804f79e733eaee1721a07b5aca c;hb=HEAD
in the follwong cases:

1) Per-system tw_count is greater than per-system max_tw_buckets limit:
tw_count < sysctl_max_tw_buckets
net.ipv4.tcp_max_tw_buckets = 1800000
IMHO very unlikely in your situation

2) Per-VE counter is greater than per-VE max_tw_buckets limit:
tw_count < sysctl_tcp_max_tw_buckets_ub
net.ipv4.tcp_max_tw_buckets_ub = 165360

IMHO unlikely too

3) inside VE tw_buckets eats too many memory (greater than allowed fraction of kmemsize)
net.ipv4.tcp_max_tw_kmem_fraction = 384 means 38.4% of kmemsize

IMHO very likely

4) kmemsize shortage inside VE -- in this case you should have new failcounters for kmemsize parameter.
IMHO unlikely

Resume:
You need to find VE that generates these messages and increase its kmemsize. Or You can increase setting for net.ipv4.tcp_max_tw_kmem_fraction sysctl

ToDo: make this message cleaner
http://bugzilla.openvz.org/show_bug.cgi?id=767

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