Re: Time sliced CFQ io scheduler

Jens Axboe
2004-12-08T12:48:00Z

On Wed, Dec 08 2004, Jens Axboe wrote:
> On Wed, Dec 08 2004, Jens Axboe wrote:
> > > Hmm, damn. Lots of stuff. I guess some of the notable ones that I've
> > > had trouble with are OraSim (Oracle might give you a copy), Andrew's
> > > patch scripts when applying a stack of patches, pgbench... can't
> > > really remember any others off the top of my head.
> >
> > The patch scripts case is interesting, last night (when committing other
> > patches) I was thinking I should try and bench that today. It has a good
> > mix of reads and writes.
>
> AS is currently 10 seconds faster for that workload (untar of a kernel
> and then applying 2237 patches). AS completes it in 155 seconds, CFQ
> takes 164 seconds.

Turned out to be a stupid dispatch sort error in cfq, now it has the
exact same runtime as AS.

--
Jens Axboe