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SubjectRe: [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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