linux-ext4 - Re: seekwatcher IO visualization

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Message-ID: <20070809220111.24d782cd@gara>
Date:	Thu, 9 Aug 2007 22:01:11 -0500
From:	"Jose R. Santos" <jrs@...ibm.com>
To:	Andreas Dilger <adilger@...sterfs.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: seekwatcher IO visualization

On Thu, 9 Aug 2007 14:53:55 -0600
Andreas Dilger <adilger@...sterfs.com> wrote:

> I saw on #linuxfs today some graphs and movies by Chris Mason showing
> the poor IO locality for ext3 compared to btrfs and XFS.  It would be
> interesting to run this with ext4+mballoc+delalloc, and a separate
> one with the FLEXBG feature enabled to see how that improves the
> seeking/locality.
> 
> http://oss.oracle.com/~mason/seekwatcher/
> 
> Cheers, Andreas
> --
> Andreas Dilger
> Principal Software Engineer
> Cluster File Systems, Inc.
> 

I was planing to use seekwatcher to look at fsck activity when using
FLEX_BG since I'm already seeing noticeable improvements by using this
feature alone.

We can try other workloads and see how ext4 compares.

-JRS
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