Re: [squid-users] Large scale high performance squid on FreeBSD - problems

On Fri, 5 Dec 2003, Andriy Korud wrote:

> Nothing except
> comm_accept: FD 12: (53) Software caused connection abort
> 1-5 times per second.
> I don't think problem is with disks: diskd processes use 1% CPU, while squid
> process itself - 99-100%. And as CPU usage grows, visual disks activity
> reduces.

I've seen this with large numbers of connections open from clients, even
at relatively low request rates (though that was with an accelerator setup
and there was essentially no disk activity). Are you using a particularly
large number of open connections for your testing?

I've found Squid 3 with kqueue to be a lot better when thousands of
connections are open at a time; you may wish to try that.

> proxy# sysctl -a | grep maxfiles
> kern.maxfiles: 4136
> kern.maxfilesperproc: 3722

maxfiles seems a little low if you are expecting lots of connections;
you'll probably need to set both maxfiles and nmbclusters a bit higher in
your kernel configuration. I don't think that increasing it with sysctl
will increase maxsockets as well. Increasing net.inet.tcp.tcbhashsize in
/boot/loader.conf might be a good idea, too.

If you're testing with a large number of connections coming from a single
host you'll probably also need to increase net.inet.ip.portrange.last.
Received on Fri Dec 05 2003 - 11:37:14 MST