svn commit: r206497 - in head: sbin/geom/class sbin/geom/class/sched sys/geom/sched sys/modules/geom sys/modules/geom/geom_sched sys/modules/geom/geom_sched/gs_sched sys/modules/geom/geom_sched/gsc...

[Luigi Rizzo]

On Tue, Apr 13, 2010 at 07:09:50PM +0000, b. f. wrote:
> >Author: luigi
> >Date: Mon Apr 12 16:37:45 2010
> >New Revision: 206497
> >URL: http://svn.freebsd.org/changeset/base/206497
> >
> >Log:
> >  Bring in geom_sched, support for scheduling disk I/O requests
> >  in a device independent manner. Also include an example anticipatory
> >  scheduler, gsched_rr, which gives very nice performance improvements
> >  in presence of competing random access patterns.
> 
> Thank you for bringing this in.  Do you or your collaborators also
> plan to add the BFQ scheduler that was in the earlier separate

sooner or later, yes.

> tarballs?  The numbers at
> 
> http://algo.ing.unimo.it/people/paolo/disk_sched/
> 
> suggest that it worked well in a different context.
> 
> Also, there is a typographical error in the gsched(8) manpage: in the
> EXAMPLES section, "-s" should be "-a" in:
> 
>            # Configure device ad0 to use scheduler 'rr':
>            geom sched insert -s rr ad0

thanks, will fix that

cheers
luigi