Re: [squid-users] RE: Increased service times using aufs vs diskd

Have you tried reiserfs with noatime,notail?

That's said to be among the fastest performers among mainstream
filesystems for Squid.

On Tuesday 27 June 2006 3:09 pm, O'Brien, Kevin wrote:
> Unfortunately we already use ext2 and noatime, but thanks for the
> suggestion.
>
> -=Kevin=-
> -----Original Message-----
> From: Mike Rambo [mailto:mrambo@lsd.k12.mi.us]
> Sent: Tuesday, June 27, 2006 9:33 AM
> To: Squid Users List
> Subject: Re: [squid-users] RE: Increased service times using aufs vs
> diskd
>
> O'Brien, Kevin wrote:
> > No takers?
> >
> > The other interesting thing is that the service times increase as
> > traffic decreases. Any theories on that?
> >
> > -=Kevin=-
> >
> > _____________________________________________
> > Sent: Thursday, June 22, 2006 1:22 PM
> > To: 'squid-users@squid-cache.org'
> > Subject: Increased service times using aufs vs diskd
> >
> > I'm using squid as an accelerator and I switched my cache_dir from
>
> diskd
>
> > (used because server is SMP) to aufs because of various bugs in the
> > diskd code (761, 1500). However, when I make the switch (and clear
>
> the
>
> > cache_dir contents) the overall, hit, miss, and near miss service
>
> times
>
> > increase by almost 10 times. Using diskd, the 24 hour average for
> > overall, hit, and near miss is 4ms and near miss is 1ms. After the
> > switch, the times rocket up to 44ms, 43ms, 49ms, and 45ms for
> > overall, hit, miss, and near miss. I am wondering if this is just a
> > function
>
> of
>
> > the squid process now handling disk requests or is an indication of
> > another problem (although ~40ms is probably not much of a problem).
> >
> > Here's the details of the system:
> > OS: RHEL4
> > Squid: 2.5.stable14 with epoll patch
> > Build options: ./configure --enable-epoll --enable-snmp
> > --enable-removal-policies=heap,lru --enable-storeio=aufs,diskd,ufs
> > --with-pthreads --enable-cachemgr-hostname=localhost
> > --disable-ident-lookups --enable-truncate --enable-cache-digests
> > --enable-htcp
>
> <snip>
>
> I didn't see what filesystem you are using. Changing from ext3 to ext2
> and setting noatime on the cache_dir disks helped us in this
> circumstance.
Received on Tue Jun 27 2006 - 15:18:45 MDT