Re: [squid-users] Queue congestion at 60 req/sec

On Fri, Jun 08, 2007, Pablo Garc?a wrote:
> Hi, is there any scenario, where I can find this message in the
> cache.log for that amount of requests ? What I'm doing wrong ?
> squidaio_queue_request: WARNING - Queue congestion
>
>
> Running as reverse proxy
> 2 scsi disks with cache_dir configured at 60% of the size
> ext3 mounted with noatime
> REDHAT kernel 2.6.9-55.ELsmp (4 Update 5)
> 2 x Pentium III 1Ghz. 1Gb RAM
> access_log none
> cache_store_log none
> cache_mem 256 Mb
>
>
> CPU at 16% IOWAIT, 4% USER and 2,6% SYSTEM
> 60 client req/sec, 70% hit Ratio.

Well, you haven't given the one actual bit of info you need, which is IO
throughput. Run "vmstat 1" and "iostat 1", look at the device IO.
Are your objects big or small? If they're big then each object is going
to generate a whole lot more IO than smaller objects, hence the queue
congestion.

ADrian
Received on Fri Jun 08 2007 - 19:01:16 MDT