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Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc]

To: David Sparks <dave@xxxxxxxxxxxxx>
Subject: Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc]
From: Stian Jordet <liste@xxxxxxxxxx>
Date: Tue, 25 Nov 2008 23:31:08 +0100
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
In-reply-to: <492C75E2.1080701@xxxxxxxxxxxxx>
References: <1226760254.5089.11.camel@chevrolet> <430c4fa50811180551r67d5d680tf1ffa493604ac4ea@xxxxxxxxxxxxxx> <1227476908.32357.5.camel@chevrolet> <alpine.DEB.1.10.0811231721350.22594@xxxxxxxxxxxxxxxx> <1227485956.5145.10.camel@chevrolet> <alpine.DEB.1.10.0811240448570.25866@xxxxxxxxxxxxxxxx> <1227569808.5039.6.camel@chevrolet> <alpine.DEB.2.00.0811250057510.27010@xxxxxxxxxxxxxxxx> <1227645887.7992.10.camel@chevrolet> <492C6C9B.3060000@xxxxxxxxxxx> <1227649893.6557.10.camel@oldsmobile> <492C75E2.1080701@xxxxxxxxxxxxx>
ti., 25.11.2008 kl. 14.02 -0800, skrev David Sparks:
> > With no barriers, it's 22s faster than my workstation. That can't be the
> > way it's supposed to be?
> 
> What IO elevator are you using?  Did you try the 'noop' or 'deadline' 
> schedulers?
> 
> cat /sys/block/sda/queue/scheduler
> echo noop > /sys/block/sda/queue/scheduler

That improved the time 10s (noop and deadline both finished at 46s,
while cfq (still) uses 59...

Still slower than my laptop... (ok, I do understand that this is a very
static benchmark, that really doesn't say anything about real life
performance. But "everyone" unpacks the kernel faster than I, on a brand
new system worth $3500USD...

Thanks :)

-Stian

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