linux-kernel - Re: [patch] Give kjournald a IOPRIO_CLASS

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Message-ID: <473DC804.1000201@hp.com>
Date:	Fri, 16 Nov 2007 11:40:36 -0500
From:	"Alan D. Brunelle" <alan.brunelle@...com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, arjan@...radead.org,
	jens.axboe@...cle.com, mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [patch] Give kjournald a IOPRIO_CLASS_RT io priority

Alan D. Brunelle wrote:
> 
> Read large file:
> 
> Kernel  Min    Avg    Max   Std Dev    %user  %system  %iowait
> --------------------------------------------------------------
> base :  201.6  215.1  275.5   22.8     0.26%    4.69%   33.54%
> arjan:  198.0  210.3  261.5   18.5     0.33%   10.24%   54.00%
> 
> Read a tree:
> 
> Kernel  Min    Avg    Max   Std Dev    %user  %system  %iowait
> --------------------------------------------------------------
> base : 3518.2 4631.3 5991.3  784.6     0.19%    3.29%   23.56%
> arjan: 5731.6 6849.8 7777.4  731.6     0.32%    9.90%   52.70%
> 
> Overwrite large file:
> 
> Kernel  Min    Avg    Max   Std Dev    %user  %system  %iowait
> --------------------------------------------------------------
> base :  104.2  147.7  239.5   38.4      0.02%    0.05%   1.08%
> arjan:  106.2  149.7  239.2   38.4      0.25%    0.79%  14.97%
> 
>

I'm going to try and do some clean up work on the iostat CPU results - 
the reason %user & %system are so low is (I think) because they also 
include a lot of 0% results from the tail of the runs (as the unmount is 
going on I think). I'm going to try and extract results for just the 
"meat" of the runs.

Alan
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