Return-Path: <linux-kernel-owner+willy=40w.ods.org@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id <S261590AbSJAMSc>; Tue, 1 Oct 2002 08:18:32 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org
	id <S261593AbSJAMSc>; Tue, 1 Oct 2002 08:18:32 -0400
Received: from c17928.thoms1.vic.optusnet.com.au ([210.49.249.29]:2432 "EHLO
	localhost.localdomain") by vger.kernel.org with ESMTP
	id <S261590AbSJAMSb> convert rfc822-to-8bit; Tue, 1 Oct 2002 08:18:31 -0400
Content-Type: text/plain; charset=US-ASCII
From: Con Kolivas <conman@kolivas.net>
To: Andrew Morton <akpm@digeo.com>, Jens Axboe <axboe@suse.de>
Subject: Re: [BENCHMARK] 2.5.39-mm1
Date: Tue, 1 Oct 2002 22:19:21 +1000
User-Agent: KMail/1.4.3
Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>
References: <200209301941.41627.conman@kolivas.net> <20021001101520.GB20878@suse.de> <3D9976D9.C06466B@digeo.com>
In-Reply-To: <3D9976D9.C06466B@digeo.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 7BIT
Message-Id: <200210012219.53464.conman@kolivas.net>
Sender: linux-kernel-owner@vger.kernel.org
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 2217
Lines: 53

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Tuesday 01 Oct 2002 8:20 pm, Andrew Morton wrote:
> Jens Axboe wrote:
> > On Mon, Sep 30 2002, Andrew Morton wrote:
> > > > io_load:
> > > > Kernel                  Time            CPU             Ratio
> > > > 2.4.19                  216.05          33%             3.19
> > > > 2.5.38                  887.76          8%              13.11
> > > > 2.5.38-mm3              105.17          70%             1.55
> > > > 2.5.39                  229.4           34%             3.4
> > > > 2.5.39-mm1              239.5           33%             3.4
> > >
> > > I think I'll set fifo_batch to 16 again...
> >
> > As not to compare oranges and apples, I'd very much like to see a
> > 2.5.39-mm1 vs 2.5.39-mm1 with fifo_batch=16. Con, would you do that?
> > Thanks!
>
> The presence of /proc/sys/vm/fifo_batch should make that pretty easy.

Thanks. That made it a lot easier and faster, and made me curious enough to 
create a family or very interesting results. All these are with 2.5.39-mm1 
with fifo_batch set to 1->16, average of three runs. The first result is the 
unmodified 2.5.39-mm1 (fifo_batch=32).

io_load:
Kernel                  Time            CPU%            Ratio
2.5.39-mm1              239.5           32              3.54
2539mm1fb16             131.2           57              1.94
2539mm1fb8              109.1           68              1.61
2539mm1fb4              146.4           51              2.16
2539mm1fb2              112.7           65              1.67
2539mm1fb1              125.4           60              1.85

What's most interesting is the variation was small until the number was <8; 
then the variation between runs increased. Dare I say it there appears to be 
a sweet spot in the results.

Con
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQE9mZLPF6dfvkL3i1gRAjYnAKCGvWq43uTeClFz2tb6d8fcVe95zwCfbor2
HKO0FgK8kVsEvyQ3FwYaubg=
=bAzC
-----END PGP SIGNATURE-----
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/