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time wait bucket table overflow [message #10202]

Mon, 12 February 2007 14:31

Thomas Kramer
Messages: 2
Registered: February 2007

Junior Member

Hi there,

on a very busy OpenVZ Server i have a lot of:

Feb 12 15:25:51 server12 kernel: TCP: time wait bucket table overflow

entries in my syslog file.

Any ideas?

Kernel is 2.6.18-028test015.1+31-ovz-smp

--
Regards,
Thomas

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Re: time wait bucket table overflow [message #10203 is a reply to message #10202]

Mon, 12 February 2007 15:39

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

Thomas,

can you check this one please:
http://bugzilla.openvz.org/show_bug.cgi?id=460

Thanks,
Kirill

> Hi there,
>
> on a very busy OpenVZ Server i have a lot of:
>
> Feb 12 15:25:51 server12 kernel: TCP: time wait bucket table overflow
>
> entries in my syslog file.
>
> Any ideas?
>
> Kernel is 2.6.18-028test015.1+31-ovz-smp
>

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Re: time wait bucket table overflow [message #10208 is a reply to message #10203]

Mon, 12 February 2007 16:10

Thomas Kramer
Messages: 2
Registered: February 2007

Junior Member

Hi Kirill,

> can you check this one please:
> http://bugzilla.openvz.org/show_bug.cgi?id=460

thx. I can�t find any value for /proc/sys/net/ipv4/
tcp_max_tw_buckets_ve and changing /proc/sys/net/ipv4/
tcp_max_tw_kmem_fraction to 256 did not solve this problem.

Regards,
Thomas

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Re: time wait bucket table overflow [message #10217 is a reply to message #10208]

Mon, 12 February 2007 21:34

kir
Messages: 1645
Registered: August 2005
Location: Moscow, Russia

Senior Member

Thomas Kramer wrote:
> Hi Kirill,
>
>> can you check this one please:
>> http://bugzilla.openvz.org/show_bug.cgi?id=460
>
> thx. I can´t find any value for
> /proc/sys/net/ipv4/tcp_max_tw_buckets_ve and changing
> /proc/sys/net/ipv4/tcp_max_tw_kmem_fraction to 256 did not solve this
> problem.
Most probably the right name is
/proc/sys/net/ipv4/tcp_max_tw_buckets_ub. It is per-VE timewait bucket
limit, apparently it's set too low (1024). Please increase it several
times (8x or 16x) and report your results to the above bug.

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