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Re: xfs performance tuning

To: "Nathan Scott" <nathans@xxxxxxx>
Subject: Re: xfs performance tuning
From: "Wendy Cheng" <s_wendy_cheng@xxxxxxxxxxx>
Date: Tue, 3 Jun 2003 13:19:24 -0400
Cc: "xfs mailing list" <linux-xfs@xxxxxxxxxxx>
References: <3512.1054466831@ocs3.intra.ocs.com.au> <BAY2-DAV57lTbOzrPC40003086a@hotmail.com> <20030602230713.GC714@frodo> <BAY2-DAV29U29AhsFt4000049f7@hotmail.com> <20030603051946.GA1165@frodo>
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Nathan,

Thanks - will comply and send out the info.

Also we just built a profiling kernel (thanks to SGI again for 
the kernprof tool). Need to run this first to see what's going on.

Wendy
--------
----- Original Message ----- 
From: "Nathan Scott" <nathans@xxxxxxx>
To: "Wendy Cheng" <s_wendy_cheng@xxxxxxxxxxx>
Cc: "xfs mailing list" <linux-xfs@xxxxxxxxxxx>
Sent: Tuesday, June 03, 2003 1:19 AM
Subject: Re: xfs performance tuning


| On Mon, Jun 02, 2003 at 09:29:56PM -0400, Wendy Cheng wrote:
| > Great thanks ! - but these are kind of obivous.
| 
| Why not post the XFS and ext2 numbers you are seeing currently
| with your current filesystem geometry (esp. xfs_info output),
| mount options, and kernel build options, and then any benchmark
| variations that that the suggested options make, then it might
| be clearer where to look.
| 
| There are plenty more knobs to tweak, yes.  You should also
| check that you are not doing any extra checks (e.g. do you have
| debug or ACLs enabled?) that are not being done in ext2.
| 
| cheers.
| 
| 
| > Are there more ? :). Could I turn off  / delay
| > kupdated and assume that when incore log buffers
| > are full, it would be automatically flushed into
| > disk without kupdated's help ?  We have lots 
| > of memory to spare and have turned on highmem IO.
| > 
| > Wendy
| > ---------
| > ----- Original Message ----- 
| > From: "Nathan Scott" <nathans@xxxxxxx>
| > To: "Wendy Cheng" <s_wendy_cheng@xxxxxxxxxxx>
| > Cc: "xfs mailing list" <linux-xfs@xxxxxxxxxxx>
| > Sent: Monday, June 02, 2003 7:07 PM
| > Subject: Re: xfs performance tuning
| > 
| > 
| > | On Mon, Jun 02, 2003 at 06:15:11PM -0400, Wendy Cheng wrote:
| > | > We're trying out XFS using SPECsfs benchmark and 
| > | > could only get ~ half of the IOPS when compared
| > | > with EXT2. It might not be a fair comparison since EXT2 
| > | > is not a journaling file system but would love to know
| > | > any tuning parameter to boost the number. Could someone
| > | > help out ? Thanks...
| > | 
| > | I would suggest starting with the mkfs options "-l size=XXX" and
| > | "-i size=XXX" (log size and inode size).  Increasing the number
| > | of incore log buffers you're using ("-o logbufs=XXX" mount option)
| > | might help you too.
| > | 
| > | cheers.
| > | 
| > | -- 
| > | Nathan
| > | 
| 
| -- 
| Nathan
| 
| 
| 


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