Re: [patch] vmfixes-2.4.0-test9-B2

On Mon, Sep 25 2000, Andrea Arcangeli wrote:

quoted

And a new elevator was introduced some months ago to solve this.

And now that I done some benchmark it seems the major optimization consists in
the implementation of the new _ordering_ algorithm in test2, not really from
the removal of the more finegrined latency control (said that I'm not going to
reintroduce the previous latency control, the current one doesn't provide
great latency but it's ok).

Yes, I found this the greatest improvement too.

As soon I patch my tree with Peter's perfect CSCAN ordering (that only changes
the ordering algorithm), tiotest performance drops significantly in the
2-thread-reading case. elvtune settings doesn't matter, that's only a matter
of the ordering.

Interesting. I haven't done any serious benching with the CSCAN introduction
in elevator_linus, I'll try that too.

-- 
* Jens Axboe [off-list ref]
* SuSE Labs
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