Re: [squid-users] High Utilization

On Fri, 18 Mar 2005 17:22:51 +0100 (CET), Henrik Nordstrom
<hno@squid-cache.org> wrote:

> On Fri, 18 Mar 2005, Jorgen Rosink wrote:

> > Yeah, that's why I have no clue how it could be that sometimes there's
> > a stall for about 5 seconds client side (congestion free network btw).

> Try the following
 
> squidclient -g 60 /squid-internal-static/icons/anthony-unknown.gif & vmstat 1 60
>
> is there any irregularities observed in the output of the above when the
> clients stall?

Will try that next monday, when there's some load...
 
> One thing which I experienced at a customer recently is if you are using
> the Linux ext3 filesystem. It is then quite important that the cache
> filesystem is mounted with "noatime", and also a good idea to increase the
> ext3 journals size. If not the ext3 filesystem will temporarily "lock up"
> while flushing the journal when under high load, effectively halting
> Squid. This can be seen in the output of the command above as periods
> with a lot of pageout activity with no responses from Squid.

I'm using reiserfs (3.6), just for the cache volumes, mounted with
notail and noatime options. I'll look for the periods anyway ;-).

Thanks,

Jorgen Rosink
Received on Fri Mar 18 2005 - 14:32:01 MST