xfs_fsr, sunit, and swidth

[Dave Chinner]

On Mon, Mar 25, 2013 at 01:00:51PM -0400, Dave Hall wrote:
> 
> Dave Hall
> Binghamton University
> kdhall at binghamton.edu
> 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....

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com