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Re: Strange delete performance using XFS

To: Thomas Kaehn <tk@xxxxxxxxxxx>
Subject: Re: Strange delete performance using XFS
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Thu, 5 Apr 2007 07:11:41 -0400 (EDT)
Cc: Chris Wedgwood <cw@xxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20070405105005.GF2759@xxxxxxxxxxxxxxxxxx>
References: <20070404130535.GE18320@xxxxxxxxxxxxxxxxxx> <20070404154523.GA20096@xxxxxxxxxxxxxxxxxxxxx> <20070405072803.GB2759@xxxxxxxxxxxxxxxxxx> <20070405090333.GE2759@xxxxxxxxxxxxxxxxxx> <Pine.LNX.4.64.0704050621350.17700@xxxxxxxxxxxxxxxx> <20070405105005.GF2759@xxxxxxxxxxxxxxxxxx>
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On Thu, 5 Apr 2007, Thomas Kaehn wrote:

Hi Justin,

On Thu, Apr 05, 2007 at 06:21:43AM -0400, Justin Piszcz wrote:
So there is no improvement for a single disk.

What kind of disks are you using? Maybe just slow disks??

I am using the following disks:


When disabling write barriers delete times are OK. I think that
the 3ware RAID controller could have a problem with it. I'll try to
contact 3ware in order to come to know if this feature is supported or

Additionally I am going to try out some advices presented in the
3ware knowledge base.

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Ah, ok-- Keep us updated/let us know if you get any new findings/etc.

Something else you can try as well is turning off NCQ, that gave me a 10-35% performance boost depending on the benchmark.

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