Socket problem in Fedora Core 2
Andreas Storm
powerout at home.se
Thu Sep 8 16:53:29 UTC 2005
Hi Bob,
Sorry for top-posting. Thanks for the help, will
try it out right away.
/Andreas
-----Original Message-----
From: Bob Chiodini <rchiodin at bellsouth.net>
To: For users of Fedora Core releases <fedora-list at redhat.com>
Date: Thu, 08 Sep 2005 10:17:08 -0400
Subject: Re: Socket problem in Fedora Core 2
On Thu, 2005-09-08 at 10:10 -0400, Bob Chiodini wrote:
> On Thu, 2005-09-08 at 14:58 +0200, Andreas Storm wrote:
> > Hi,
> >
> > My setup: Fedora Core 2 with 2.6.10-1.771_FC2smp kernel.
> >
> > I'm currently developing a simulator for load testing
> > which needs to handle around 40-50K connections. A mixture of TCP and UDP.
> >
> > I changed the amount of file descriptors to 64000
> > with ulimit -n 64000 as root.
> >
> > But when I run and reach around 27000 TCP connections
> > my application stops and dmesg writes the following:
> >
> > "out of socket memory" several times.
> >
> > I wonder what is the problem and how it can be fixed. Didn't have any luck at the mail archive or google.
> >
> > Any help appreciated.
> >
> > Br,
> > /Andreas
> >
> >
> >
>
> Andreas,
>
> I found the "out of socket memory" in tcp_timer.c. The implication that
> the sysctl variable net.ipv4.tcp_max_orphans controls the limit (among
> other things). On FC3 this is set to 65536. What is it in FC2?
>
> Bob...
>
Andreas,
I found an FC2 machine:
/sbin/sysctl net.ipv4.tcp_max_orphans
net.ipv4.tcp_max_orphans = 16384
You might try bumping that number up.
Bob...
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