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Re: xfs_fsr, sunit, and swidth

To: Dave Hall <kdhall@xxxxxxxxxxxxxx>
Subject: Re: xfs_fsr, sunit, and swidth
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Wed, 27 Mar 2013 16:16:37 -0500
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <515082C3.2000006@xxxxxxxxxxxxxx>
References: <5140C147.7070205@xxxxxxxxxxxxxx> <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>
Reply-to: stan@xxxxxxxxxxxxxxxxx
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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
> agroups?

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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