topic Re: TIME_WAIT in Operating System - Linux

TIME_WAIT

Chakravarthi — Thu, 20 Oct 2005 08:07:52 GMT

hi,

i'm using 2.2 kernel machine, in this socket goes to TIME_WAIT state and doesnt accept any new connections for 60 seconds. how do i reduce the timeout value in 2.2 kernel

i tried changing values of tcp_fin_timeout and also i tried the following command

sysctl -w net.ipv4.vs.timeout_timewait=30 it gives error
error: 'net.ipv4.vs.timeout_timewait' is an unknown key

is there any other way to come out of this problem?

-chakri

Re: TIME_WAIT

Sergejs Svitnevs — Thu, 20 Oct 2005 08:42:44 GMT

Did you try the following command ?
# sysctl -w net.ipv4.tcp_fin_timeout = 30

Regards,
Sergejs

Re: TIME_WAIT

Ivan Ferreira — Thu, 20 Oct 2005 08:44:23 GMT

I don't have 2.2 kernel, but in the version I use, the value is:

net.ipv4.tcp_fin_timeout

But, why does not accept new connections? Is not a daemon that can spawn childs?

Re: TIME_WAIT

Chakravarthi — Mon, 24 Oct 2005 23:46:28 GMT

not sure, using an application which opens a socket connectiona and when you close the socket it goes to TIME_WAIT state and doesnt accept new connection for 60 seconds. tried changing all the parameters still no luck.

--chakri

Re: TIME_WAIT

Muthukumar_5 — Tue, 25 Oct 2005 01:30:32 GMT

check resource status of CPU and memory or disk. May be any of them are getting saturated. sysctl -a | grep timewait gives if there is a tunable called net.ipv4.vs.timeout_timewait. Else select relavent tunable regarding to 2.2 kernel.

-Muthu

Re: TIME_WAIT

Muthukumar_5 — Tue, 25 Oct 2005 01:34:01 GMT

what are the tunables you are trying?

http://akt.sourceforge.net/doc/akt.list.02.html - List.

# check list

# dmesg -c gives more related errors for tuning
# resource usage with sar or top

-Muthu

Re: TIME_WAIT

B. Hulst — Tue, 25 Oct 2005 14:50:07 GMT

Hi,

Reducing a time out value is not a very stable option in many cases...

Regards,
Bob

Re: TIME_WAIT

Chakravarthi — Wed, 26 Oct 2005 01:39:04 GMT

which is the equivalent key in 2.2 of net.ipv4.vs.timeout_timewait?