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

To: Eric Sandeen <sandeen@xxxxxxxxxxx>
Subject: Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc]
From: Stian Jordet <liste@xxxxxxxxxx>
Date: Tue, 25 Nov 2008 22:51:33 +0100
Cc: Stian Jordet <liste@xxxxxxxxxx>, Sven-Haegar Koch <haegar@xxxxxxxxx>, xfs@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <492C6C9B.3060000@xxxxxxxxxxx>
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>
ti., 25.11.2008 kl. 15.22 -0600, skrev Eric Sandeen:
> Depending on the old system, perhaps its storage did not allow the
> barriers to be honored, so after xfs saw a test barrier write fail at
> mount time, it disabled them ... you'd see a message if that were the
> case, FWIW.

I know those messages, I get them on my old server. But my old
workstation did not disable the barrier...

But I still don't understand this. On my laptop (HP EliteBook 8530w,
very very powerful, but still a laptop, not an eight core, hardware raid
workstation...), I get this (xfs partition):

barrier:

time bash -c 'tar xjf linux-2.6.27.7.tar.bz2; sync'

real    1m30.855s
user    0m23.265s
sys     0m4.096s

nobarrier:

time bash -c 'tar xjf linux-2.6.27.7.tar.bz2; sync'

real    0m37.602s
user    0m15.281s
sys     0m4.184s

With no barriers, it's 22s faster than my workstation. That can't be the
way it's supposed to be?

-Stian

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