Re: [PATCH 3/6] writeback: sync expired inodes first in backgroundwriteback

[Dave Chinner]

On Wed, Apr 20, 2011 at 03:38:22PM +0800, Wu Fengguang wrote:
> > make. Please test against a vanilla kernel if that is what you are
> > aiming these patches for. If you aren't aiming for a vanilla kernel,
> > please say so in the patch series header...
> 
> Here are the test results for vanilla kernel. It's again shows better
> numbers for dd, tar and overall run time.
> 
>              2.6.39-rc3   2.6.39-rc3-dyn-expire+
> ------------------------------------------------
> all elapsed     256.043      252.367
> stddev           24.381       12.530
> 
> tar elapsed      30.097       28.808
> dd  elapsed      13.214       11.782

The big reduction in run-to-run variance is very convincing - moreso
than the reduction in runtime - That's kind of what I had hoped
would occur once I understood the implications of the change. Thanks
for running the test to close the loop. :)

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx
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