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Re: Performance drop in Linux 2.4.19-XFS 1.2 ?

To: Craig Tierney <ctierney@xxxxxxxx>
Subject: Re: Performance drop in Linux 2.4.19-XFS 1.2 ?
From: Seth Mos <knuffie@xxxxxxxxx>
Date: Wed, 30 Jul 2003 21:43:50 +0200
Cc: Cliff Wells <logiplex@xxxxxxxxx>, Ravi Wijayaratne <ravi_wija@xxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <20030730192438.GA6320@hpti.com>
References: <4.3.2.7.2.20030730204531.03df52f0@pop.xs4all.nl> <4.3.2.7.2.20030730110055.041a1bc0@pop.xs4all.nl> <4.3.2.7.2.20030730110055.041a1bc0@pop.xs4all.nl> <4.3.2.7.2.20030730204531.03df52f0@pop.xs4all.nl>
Sender: linux-xfs-bounce@xxxxxxxxxxx
At 13:24 30-7-2003 -0600, Craig Tierney wrote:

Sorry if this is a repeat, I haven't seen the whole
thread.  Did you try increasing the scsi max readahead?

I found them already since new something like this existed in proc :-)

   echo "511" > /proc/sys/vm/max-readahead
    echo "127" > /proc/sys/vm/min-readahead

I used 512 and 128 but it works!

Yay!

This helps on my filesystems with Fibre Channel hardware.
However, I have always had this problem.  It didn't start
with 2.4.20.  I don't use Redhat kernels so maybe there
is something that changed there.

I think one of the defaults got botched during the RedHat errata patching. This isn't the first time they forgot something.


I'll try the 1.3pre next and try this as well. If it has the same problem we should get it patched.

Cheers

--
Seth
It might just be your lucky day, if you only knew.


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