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RE: RE: Increased service times using aufs vs diskd

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Unfortunately we already use ext2 and noatime, but thanks for the
suggestion.

-=Kevin=-
-----Original Message-----
From: Mike Rambo [mailto:mrambo@xxxxxxxxxxxxx] 
Sent: Tuesday, June 27, 2006 9:33 AM
To: Squid Users List
Subject: Re:  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@xxxxxxxxxxxxxxx'
> 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.


-- 
Mike Rambo
mrambo@xxxxxxxxxxxxx

Many today claim to be tolerant. True tolerance, however, can cope
with others being intolerant.
     -Nigel Cunningham




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