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Re: Strange delete performance using XFS

To: Chris Wedgwood <cw@xxxxxxxx>
Subject: Re: Strange delete performance using XFS
From: Thomas Kaehn <tk@xxxxxxxxxxx>
Date: Thu, 5 Apr 2007 11:03:33 +0200
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20070405072803.GB2759@xxxxxxxxxxxxxxxxxx>
References: <20070404130535.GE18320@xxxxxxxxxxxxxxxxxx> <20070404154523.GA20096@xxxxxxxxxxxxxxxxxxxxx> <20070405072803.GB2759@xxxxxxxxxxxxxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
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Hi Chris,

On Thu, Apr 05, 2007 at 09:28:03AM +0200, Thomas Kaehn wrote:
> On Wed, Apr 04, 2007 at 08:45:23AM -0700, Chris Wedgwood wrote:
> > On Wed, Apr 04, 2007 at 03:05:35PM +0200, Thomas Kaehn wrote:
> > > The XFS was first created using default options and later on with
> > > "-d su=64k,sw=2 -l su=64k" which improved overall performance
> > > but not delete performance.
> > 
> > have you tried w/o using the hw raid?
> 
> I'am going to test with a single disk in the same machine. 

this is what I got with a single disk (defaults for mkfs.xfs, logbufs=8 for
mount) in the same machine:

| # time for i in `seq 1 100000`; do dd if=/dev/zero of=$i bs=1k count=20 
>/dev/null 2>&1; done
| 
| real    11m22.487s
| user    0m30.278s
| sys     2m33.762s
| # time \rm -rf y
| 
| real    8m20.963s
| user    0m0.056s
| sys     0m7.968s

So there is no improvement for a single disk.

Ciao,
Thomas
-- 
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