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Re: performance patches

To: Mihai RUSU <dizzy@xxxxxxxxx>
Subject: Re: performance patches
From: Stephen Lord <lord@xxxxxxx>
Date: 27 Apr 2002 07:01:23 -0500
Cc: Paul Schutte <paul@xxxxxxxx>, Thor Lancelot Simon <tls@xxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <Pine.LNX.4.33.0204270151150.2412-100000@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <Pine.LNX.4.33.0204270151150.2412-100000@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
On Fri, 2002-04-26 at 18:10, Mihai RUSU wrote:
> Hi guys
> Excuse me for dropping in but I wanted to say some things about this
> subject.
> We are using an XFS partition for a high I/O load (many IOPs, not too
> much transfer).
> The partition is 100Gb and its using its default log size (as per
> xfs_info) of 3200 blocks (4096 bytes for a block).
> Also I am monitoring (MRTG graphs) the IOPs as from /proc/stat | grep
> disk_io . Would it be right to consider from /proc/stat the firs value
> as the number of I/O transactions?
> Ex:
> disk_io: (3,0):(10899763,847269,16900622,10052494,159221833)
> (48,0):(52710982,15933971,287172411,36777011,545459600)
> Whould 52710982 be the number of I/O transactions of the device 48,0 ?
> If yes then would help very much to get statistics from them and maybe
> answer the question of a log of X size would lower the performance of XFS
> partition of Y size and Z transactions/s.
> PS: having a single XFS partition of device 48,0
> Thanks
> ----------------------------
> Mihai RUSU
> Disclaimer: Any views or opinions presented within this e-mail are solely
> those of the author and do not necessarily represent those of any company,
> unless otherwise specifically stated.

If you look in cmd/xfsmisc in the cvs tree you will find a script
called xfs_stats.pl, make this an executable and it will dump all
sorts of stats out of xfs. There is text further down the file which
explains what the numbers mean.

I have come across a command called iostat which you can get here:

which will report io requests nicely.



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