Re: [patch] Give kjournald a IOPRIO_CLASS_RT io priority

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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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