linux-ext4 - Re: jbd/jbd2 performance improvements

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Date:	Thu, 16 Oct 2008 08:06:55 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Solofo.Ramangalahy@...l.net
CC:	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org,
	Eric Sandeen <sandeen@...hat.com>
Subject: Re: jbd/jbd2 performance improvements

Solofo.Ramangalahy@...l.net wrote:
> Hi Ric,
>
>   
>>>>>> On Wed, 15 Oct 2008 13:29:55 -0400, Ric Wheeler <rwheeler@...hat.com> said:
>>>>>>             
>     Ric> We are going to try and poke at this - do you suspect a single or 
>     Ric> multi-threaded test would work best?
>
> I've performed some tests:
> http://www.bullopensource.org/ext4/20081013-2.6.27-rc9-ext4-1-akpm-fix-run6/
> http://www.bullopensource.org/ext4/20081013-2.6.27-rc9-ext4-1-akpm-fix-run6/results_sorted.txt.html
>
> I now realize that the results may not be valid since I used kvm, but
> they do show variation wrt. the number of threads.
>
> So you may want to test both single and multi-threaded.
>
>   
A very thorough test, but the results don't seem to point to a 
consistent winner.

I agree that running without KVM in the picture might be very 
interesting. Eric has some similar tests underway, I think that his 
results were also inconclusive so far...

Ric


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