From: Jens Axboe <axboe@suse.de>
To: Nick Piggin <piggin@cyberone.com.au>
Cc: Con Kolivas <kernel@kolivas.org>, Andrew Morton <akpm@digeo.com>,
linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: [BENCHMARK] 2.5.66-mm2 with contest
Date: Wed, 2 Apr 2003 10:15:42 +0200 [thread overview]
Message-ID: <20030402081542.GB3367@suse.de> (raw)
In-Reply-To: <3E8A9A83.1070704@cyberone.com.au>
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
prev parent reply other threads:[~2003-04-02 8:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-02 3:23 Con Kolivas
2003-04-02 4:08 ` Nick Piggin
2003-04-02 7:42 ` Jens Axboe
2003-04-02 7:57 ` Nick Piggin
2003-04-02 7:58 ` Jens Axboe
2003-04-02 8:08 ` Nick Piggin
2003-04-02 8:15 ` Jens Axboe [this message]
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