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SubjectRe: [patch] vmfixes-2.4.0-test9-B2
On Mon, Sep 25 2000, Andrea Arcangeli wrote:
> > 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 <>
* SuSE Labs
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