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

To: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Subject: Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc]
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 25 Nov 2008 05:44:15 -0500
Cc: Eric Sandeen <sandeen@xxxxxxxxxxx>, Stian Jordet <liste@xxxxxxxxxx>, Alan Piszcz <ap@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <alpine.DEB.1.10.0811250456010.16346@xxxxxxxxxxxxxxxx>
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> <492B5684.2080107@xxxxxxxxxxx> <alpine.DEB.1.10.0811250456010.16346@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
On Tue, Nov 25, 2008 at 04:56:24AM -0500, Justin Piszcz wrote:
> barriers enabled:
> 
> $ time bash -c 'tar xf linux-2.6.27.7.tar; sync'
> block 573932: ** Block of NULs **
> Total bytes read: 293857280 (281MiB, 1.9MiB/s)
> 
> real    2m40.643s
> user    0m0.194s
> sys     0m1.541s
> 
> barriers disabled:
> 
> time bash -c 'tar xf linux-2.6.27.7.tar; sync'
> block 573932: ** Block of NULs **
> Total bytes read: 293857280 (281MiB, 11MiB/s)
> 
> real    0m27.612s
> user    0m0.182s
> sys     0m1.617s

That's worse than usual, and even the no-barriers numbers are still
really bad.  What kind of disk and controller is this?  Did you
try to disable the cache with hdparm and see what that gives?

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