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Re: xfs_fsr, sunit, and swidth

To: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: Re: xfs_fsr, sunit, and swidth
From: Dave Hall <kdhall@xxxxxxxxxxxxxx>
Date: Mon, 25 Mar 2013 13:00:51 -0400
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130316072126.GG6369@dastard>
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Dave Hall
Binghamton University
607-760-2328 (Cell)
607-777-4641 (Office)

On 03/16/2013 03:21 AM, Dave Chinner wrote:
Using perf to profile the kernel while the cp -al workload is
running will tell use exactly where the CPU is being burnt. That
will confirm the analysis, or point us at some other issue that is
causing excessive CPU burn...

Dave, which perf command(s) would you like me to run. (I'm familiar with the concept behind this kind of tool, but I haven't worked with this one before).

Also, what would you like me to do with the xfs_db freesp output for 26 agroups?


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