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From Reindl Harald <h.rei...@thelounge.net>
Subject Re: Lots of TCP time_wait connections
Date Fri, 24 Aug 2012 14:50:45 GMT


Am 24.08.2012 16:17, schrieb sridhar basam:
> time_waits are normal part of the tcp teardown process.

as i said

> If you are an very busy site and if the
> connection rate at the origins is high enough, even with keepalive, i
> would try the the 2nd set of sysctl changes before the tcp_tw_reuse
> one as a last resort.

ona REALLY busy server and under DDOS you will need both
and the scond set even with lower values if this is only
a http server

> On Fri, Aug 24, 2012 at 5:12 AM, Reindl Harald <h.reindl@thelounge.net> wrote:
>>
>>
>> Am 24.08.2012 11:06, schrieb Andrew Ashcroft:
>>
>>> We’re seeing a lot of TCP connections in time_wait on our origin servers and
it’s beginning to effect the
>>> performance of the site.
>>
>> TIME_WAIT is from the view of the application a closd connection
>> http://developerweb.net/viewtopic.php?id=2941
>>
>> /etc/sysct.conf:
>> net.ipv4.tcp_tw_reuse = 1
>>
>> followed by "sysctl -p" may help here
>> ________________________
>>
>> you may also like these changes in busy servers
>>
>> net.ipv4.tcp_fin_timeout = 5
>> net.ipv4.tcp_retries1 = 6
>> net.ipv4.tcp_syn_retries = 6
>> net.ipv4.tcp_synack_retries = 2
>> net.ipv4.ip_local_port_range = 2000 65535
>> net.ipv4.tcp_slow_start_after_idle = 0
>>
>>
>>

-- 

Reindl Harald
the lounge interactive design GmbH
A-1060 Vienna, Hofmühlgasse 17
CTO / CISO / Software-Development
p: +43 (1) 595 3999 33, m: +43 (676) 40 221 40
icq: 154546673, http://www.thelounge.net/

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