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Re: xfs_fsr, sunit, and swidth

To: stan@xxxxxxxxxxxxxxxxx
Subject: Re: xfs_fsr, sunit, and swidth
From: Dave Hall <kdhall@xxxxxxxxxxxxxx>
Date: Fri, 29 Mar 2013 15:59:46 -0400
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
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Dave, Stan,

Here is the link for perf top -U: http://pastebin.com/JYLXYWki. The ag report is at http://pastebin.com/VzziSa4L. Interestingly, the backups ran fast a couple times this week. Once under 9 hours. Today it looks like it's running long again.


Dave Hall
Binghamton University
607-760-2328 (Cell)
607-777-4641 (Office)

On 03/27/2013 05:16 PM, Stan Hoeppner wrote:
On 3/25/2013 12:00 PM, Dave Hall wrote:
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).
I'll let Dave answer this one.

Also, what would you like me to do with the xfs_db freesp output for 26
A pastebin link should be fine.  Only a couple of people will be looking
at it.  I don't see value in free space maps of 26 AGs being archived.

FWIW, it's probably best to reply-all instead of just to the list.
Sometimes posts get lost in the noise.  Not sure if that's the case
here, but it's been a couple of days with no response from Dave C, and
the answers to these questions are very short.  Thus I'm guessing he
missed your post, so I'm CC'ing him here.

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