From: Marc-Christian Petersen <m.c.p@wolk-project.de>
To: Andrea Arcangeli <andrea@suse.de>
Cc: linux-kernel@vger.kernel.org, Chris Mason <mason@suse.com>
Subject: Re: 2.4.22pre6aa1
Date: Tue, 22 Jul 2003 15:34:16 +0200 [thread overview]
Message-ID: <200307221427.01519.m.c.p@wolk-project.de> (raw)
In-Reply-To: <20030717225002.GY1855@dualathlon.random>
On Friday 18 July 2003 00:50, Andrea Arcangeli wrote:
Hi Andrea,
> Can you try to change include/linux/blkdev.h like this:
> -#define MAX_QUEUE_SECTORS (4 << (20 - 9)) /* 4 mbytes when full sized */
> +#define MAX_QUEUE_SECTORS (16 << (20 - 9)) /* 4 mbytes when full sized */
> This will raise the queue from 4 to 16M. That is the first(/only) thing
> that can explain a drop in performnace while doing contigous I/O.
> However I didn't expect it to make a difference, or at least not so
> relevant.
> If this doesn't help at all, it might not be an elevator/blkdev thing.
> At least on my machines the contigous I/O still at the same speed.
well, it doesn't help at all. I/O gets more worse with that change. (8mb/s
less). How can this happen? *wondering*
> You also where the only one reporting a loss of performance with
> elevator-lowlatency, it could be still the same problem that you've
> seen at that time.
The only one? Surely not. Also Con tested your elevator-lowlatency and we both
saw performance degration :)
> can you try with data=writeback (or ext2) or hdparm -W1 and see if you
> can still see the same delta between the two kernels? (careful with -W1
> as it invalidates journaling)
Yes, I'll do it later this day.
Sorry for my late reply. I've been very busy.
ciao, Marc
next prev parent reply other threads:[~2003-07-22 13:19 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-17 10:28 2.4.22pre6aa1 Andrea Arcangeli
2003-07-17 10:42 ` 2.4.22pre6aa1 ooyama eiichi
2003-07-17 10:52 ` 2.4.22pre6aa1 Marc-Christian Petersen
2003-07-17 10:53 ` 2.4.22pre6aa1 ooyama eiichi
2003-07-17 15:42 ` 2.4.22pre6aa1 Dave Jones
2003-07-17 20:31 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-17 22:13 ` 2.4.22pre6aa1 Marc-Christian Petersen
2003-07-17 22:26 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-17 22:27 ` 2.4.22pre6aa1 Mike Fedyk
2003-07-17 22:32 ` 2.4.22pre6aa1 Marc-Christian Petersen
2003-07-17 22:30 ` 2.4.22pre6aa1 Marc-Christian Petersen
2003-07-17 22:50 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-18 0:30 ` 2.4.22pre6aa1 Chris Mason
2003-07-22 12:28 ` 2.4.22pre6aa1 Marc-Christian Petersen
2003-07-22 14:04 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-18 5:47 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-22 13:34 ` Marc-Christian Petersen [this message]
2003-07-22 13:59 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-24 12:27 ` 2.4.22pre6aa1 Marc-Christian Petersen
2003-07-24 14:14 ` 2.4.22pre6aa1 Chris Mason
2003-07-18 18:18 ` 2.4.22pre6aa1 Christoph Hellwig
2003-07-18 22:27 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-18 22:48 ` 2.4.22pre6aa1 William Lee Irwin III
2003-07-18 22:53 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-18 23:04 ` 2.4.22pre6aa1 William Lee Irwin III
2003-07-18 23:12 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-18 23:53 ` 2.4.22pre6aa1 William Lee Irwin III
2003-07-19 0:04 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-23 11:21 2.4.22pre6aa1 Sergey S. Kostyliov
2003-07-25 5:28 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-07-25 11:10 ` 2.4.22pre6aa1 Sergey S. Kostyliov
2003-07-25 19:02 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-08-03 17:12 ` 2.4.22pre6aa1 Sergey S. Kostyliov
2003-08-16 11:56 ` 2.4.22pre6aa1 Andrea Arcangeli
2003-08-16 13:54 ` 2.4.22pre6aa1 Hugh Dickins
2003-08-16 14:00 ` 2.4.22pre6aa1 Hugh Dickins
2003-08-16 14:50 ` 2.4.22pre6aa1 Sergey S. Kostyliov
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