From: Andrea Arcangeli <andrea@suse.de>
To: Chris Chabot <chabotc@reviewboard.com>
Cc: linux-kernel@vger.kernel.org, Rik van Riel <riel@conectiva.com.br>
Subject: blkdev speedup
Date: Thu, 17 Jan 2002 15:13:56 +0100 [thread overview]
Message-ID: <20020117151356.G4847@athlon.random> (raw)
In-Reply-To: <20020116200459.E835@athlon.random> <3C460255.4020805@reviewboard.com>
In-Reply-To: <3C460255.4020805@reviewboard.com>; from chabotc@reviewboard.com on Wed, Jan 16, 2002 at 11:44:37PM +0100
On Wed, Jan 16, 2002 at 11:44:37PM +0100, Chris Chabot wrote:
>
> > Test hardware:
> > 4 way Dell, 4 GB physical RAM, SCSI/RAID subsystem,
> > DB runs on FS.
>
> Can we first make sure that the other factors dont plat a rol in this
> benchmark? I have a couple (14+) Dell servers here, and i know for a
> fact that most of their RAID systems are heavely borked in the
> performance department.
>
> All kernels upto 2.4.1x performed horibly, and all kernels after 2.4.16
> or so perform horibly again! Somewhere inbetween some magic seemed to
> happen in the block layer / elevator code / etc, that caused performance
> to increase upto 100% on the Dell PERC adapters. (started @ the first
> release of the AA VM). However after a few small releases, the
if you're using the blkdev directly, then please try to mount the blkdev
with a 4k filesystem before making your benchmark, that should give you
the magic performance back. 2.4.10 intentionally were defaulting to 4k
I/O, this is probably what made the difference for you.
Andrea
next prev parent reply other threads:[~2002-01-17 14:14 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.33L.0201162235480.32617-100000@imladris.surriel .com>
2002-01-16 19:04 ` Rik spreading bullshit about VM Andrea Arcangeli
2002-01-16 20:11 ` Jose Luis Domingo Lopez
2002-01-16 20:58 ` Richard Gooch
2002-01-16 21:10 ` Dave Jones
2002-01-16 21:17 ` Rik van Riel
2002-01-17 13:42 ` [lkml] " Ian Soboroff
2002-01-18 3:21 ` ...Re: " Dan Mann
2002-01-17 0:20 ` Luigi Genoni
2002-01-16 21:17 ` Craig Knox
2002-01-16 20:58 ` Bongani Hlope
2002-01-16 20:55 ` John Levon
2002-01-16 21:21 ` Bongani Hlope
2002-01-16 21:29 ` Adam Kropelin
2002-01-17 14:17 ` async buffer flushing reported slowdown (could be a driver issue?) Andrea Arcangeli
2002-01-18 0:28 ` Adam Kropelin
2002-01-16 21:58 ` Rik spreading bullshit about VM Diego Calleja
2002-01-16 22:02 ` Rik van Riel
2002-01-17 14:35 ` bugfix backed out Andrea Arcangeli
2002-01-17 15:04 ` Rik van Riel
2002-01-17 15:52 ` Andrea Arcangeli
2002-01-17 14:25 ` oom failures with mem=4m Andrea Arcangeli
2002-01-16 21:59 ` Rik spreading bullshit about VM Diego Calleja
2002-01-16 22:44 ` Chris Chabot
2002-01-17 8:18 ` Christoph Rohland
2002-01-17 14:13 ` Andrea Arcangeli [this message]
2002-01-17 0:07 ` Erik Mouw
2002-01-17 0:25 ` J Sloan
2002-01-17 1:15 ` Erik Mouw
2002-01-17 17:40 ` bill davidsen
2002-01-17 14:14 ` Alan Cox
2002-01-18 4:30 ` Bosko Radivojevic
2002-01-18 4:36 ` vm philosophising Rik van Riel
2002-01-18 4:58 ` Matthew Johnson
2002-01-18 5:12 ` Rik van Riel
2002-01-18 5:18 ` Ryan Cumming
2002-01-18 5:43 ` Matthew Johnson
2002-01-21 17:55 ` Bill Davidsen
2002-01-18 6:05 ` Matthew Johnson
2002-01-18 14:42 ` Tommy Faasen
2002-01-18 15:52 ` listmail
2002-01-21 15:50 ` The Doctor What
2002-01-21 16:16 ` Mike Harrold
2002-01-18 15:55 ` Mr. Shannon Aldinger
2002-01-18 18:39 ` Oliver Xymoron
2002-01-18 19:23 ` Alan Cox
2002-01-18 20:17 ` David Schwartz
2002-01-18 21:39 ` Alan Cox
2002-01-19 4:42 ` David Luyer
2002-01-19 18:00 ` Rob Landley
2002-01-20 5:42 ` Stevie O
2002-01-17 0:38 ` Rik spreading bullshit about VM Rik van Riel
2002-01-17 1:50 ` Nicolas Pitre
2002-01-17 11:45 ` Rik van Riel
2002-01-17 12:02 ` Stephan von Krawczynski
2002-01-17 2:14 ` Andrea Scrimieri
2002-01-17 12:07 ` Rik van Riel
2002-01-17 13:11 ` Andrea Scrimieri
2002-01-17 13:15 ` Rik van Riel
2002-01-17 14:02 ` Alan Cox
2002-01-17 21:41 ` Trever L. Adams
2002-01-18 1:46 ` brian
2002-01-17 1:52 ` Stephen Satchell
2002-01-17 13:26 ` Alan Cox
2002-01-17 15:10 ` clarification about redhat and vm Andrea Arcangeli
2002-01-17 15:21 ` Rik van Riel
2002-01-17 16:17 ` Alan Cox
2002-01-17 16:31 ` Andrea Arcangeli
2002-01-18 16:46 ` Wilhelm Nuesser
2002-01-18 19:07 ` Andrea Arcangeli
2002-01-19 10:50 ` Christoph Rohland
2002-01-19 13:54 ` Alan Cox
2002-01-19 17:38 ` Andrea Arcangeli
2002-01-18 16:53 ` Willi Nüßer
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