Re: [BENCHMARK] 2.5.66-mm2 with contest

[Jens Axboe]

On Wed, Apr 02 2003, Nick Piggin wrote:
> Jens Axboe wrote:
> 
> >On Wed, Apr 02 2003, Nick Piggin wrote:
> >
> >>Thanks for doing that, Jens. Any CPU measurements on the hash
> >>goodness that you did for deadline?
> >>
> >
> >Nope none yet, in fact Andrew's profile numbers show very little time
> >spent inside the io scheduler hash as it is. It feels like the right
> >thing to do though, even if the hash doesn't eat that much time.
> >
> I agree - especially as we want a smaller hash and with
> more requests.

Exactly. The effectiveness of the last merge hint shows that the
majority of the merges happen in succession, so the move-to-front for
last merge should have obvious benefits.

The rq-dyn-alloc patch shrinks the hash to 32 entries as a consequence.

-- 
Jens Axboe