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Re: xfs_fsr, sunit, and swidth

To: Dave Hall <kdhall@xxxxxxxxxxxxxx>
Subject: Re: xfs_fsr, sunit, and swidth
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 28 Mar 2013 12:38:41 +1100
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <515082C3.2000006@xxxxxxxxxxxxxx>
References: <514113C6.9090602@xxxxxxxxxxxxxxxxx> <514153ED.3000405@xxxxxxxxxxxxxx> <5141C1FC.4060209@xxxxxxxxxxxxxxxxx> <5141C8C1.2080903@xxxxxxxxxxxxxxxxx> <5141E5CF.10101@xxxxxxxxxxxxxx> <5142AE40.6040408@xxxxxxxxxxxxxxxxx> <20130315114538.GF6369@dastard> <5143F94C.1020708@xxxxxxxxxxxxxxxxx> <20130316072126.GG6369@dastard> <515082C3.2000006@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Mar 25, 2013 at 01:00:51PM -0400, Dave Hall wrote:
> Dave Hall
> Binghamton University
> kdhall@xxxxxxxxxxxxxx
> 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).

Just run 'perf top -U' for 10s while the problem is occurring and
pastebin the output....


Dave Chinner

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