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

ãÉÔÕÀ Henrik Nordstrom <hno@squid-cache.org>:

> On Fri, 5 Dec 2003, Andriy Korud wrote:
>
> > Hi, I need to setup squid for approx 3000 clients on 30Mbit link.
> Estimated
> > load is 10000reqs/min.
> >
> > Hardware is Xeon/2.8GHz, 1G RAM, Intel 1000/PRO Ethrenet and 2x36 Ultra320
> SCSI
> > disks dedicated for cache.
>
> Should be fine, but you might want more than 2 drives for the cache here..
>
> > The problem is the following:
> > at about 2000reqs/min Squid works fine using ~50% CPU, however when load
> grows
> > to 3000reqs/min Squid suddenly goes to 100% CPU and system becomes
> > unresponsible at all.
>
> Makybe the disks can't keep up and a backlog of requests builds up,
> and things spiral out from there..
>
> Is there anything interesting in cache.log?
>
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.
Part of my squid.conf and system maxfiles:

cache_mem 100 MB
maximum_object_size 8096 KB
maximum_object_size_in_memory 24 KB
cache_dir diskd /cache1/squid 31000 38 256
cache_dir diskd /cache2/squid 31000 38 256

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

Andriy

P.S. Maybe somebody knows where can I read about optimal squid&FreeBSD
configuration for such scale?