svn commit: r200086 - head/sys/geom/mirror

[Pawel Jakub Dawidek]

On Thu, Dec 03, 2009 at 09:47:51PM +0000, Alexander Motin wrote:
> Author: mav
> Date: Thu Dec  3 21:47:51 2009
> New Revision: 200086
> URL: http://svn.freebsd.org/changeset/base/200086
> 
> Log:
>   Change 'load' balancing mode algorithm:
>   - Instead of measuring last request execution time for each drive and
>   choosing one with smallest time, use averaged number of requests, running
>   on each drive. This information is more accurate and timely. It allows to
>   distribute load between drives in more even and predictable way.
>   - For each drive track offset of the last submitted request. If new request
>   offset matches previous one or close for some drive, prefer that drive.
>   It allows to significantly speedup simultaneous sequential reads.
>   
>   PR:		kern/113885
>   Reviewed by:	sobomax

Hmm, Will send me improved patch few days ago related to this
functionality. Could you guys compare the patches, select the best one
and commit it (or both if they serve different purposes)? I'm pretty
occupied currently and it will take probably few weeks before I can join
the discussion.

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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