From: "H . J . Lu" <hjl@lucon.org>
To: Linux 1394 <linux1394-devel@lists.sourceforge.net>
Cc: linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: Slow Disk I/O with QPS M3 80GB HD
Date: Mon, 10 Dec 2001 23:57:08 -0800 [thread overview]
Message-ID: <20011210235708.A17743@lucon.org> (raw)
In-Reply-To: <20011210203452.A3250@lucon.org>
In-Reply-To: <20011210203452.A3250@lucon.org>; from hjl@lucon.org on Mon, Dec 10, 2001 at 08:34:52PM -0800
On Mon, Dec 10, 2001 at 08:34:52PM -0800, H . J . Lu wrote:
> I have a very strange problem. The disk I/O of my QPS M3 80GB HD is
> very slow under 2.4.10 and above. I got like 1.77 MB/s from hdparm.
> But under 2.4.9, I got 14 MB/s on the same hardware. A 30GB HD has
> consistent I/O performance under 2.4.9 and above on the same bus. Has
> anyone else seen this? Does anyone have a large (>= 80GB) 1394 HD?
>
I did a binary search. 2.4.10-pre10 is the last good kernel. I got
# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 64 MB in 4.40 seconds = 14.55 MB/sec
Even since 2.4.10-pre11 up to 2.4.16, I got about 1.77 MB/sec on the
same hardware. However, I don't have problems with 80GB IDE HD. Has
anyone seen I/O problems on large (>= 80GB) SCSI HD or HD with SCSI
emulation?
H.J.
next parent reply other threads:[~2001-12-11 7:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20011210203452.A3250@lucon.org>
2001-12-11 7:57 ` H . J . Lu [this message]
2001-12-11 16:05 ` Slow Disk I/O with QPS M3 80GB HD Ben Collins
2001-12-11 16:45 ` H . J . Lu
2001-12-11 17:05 ` Ben Collins
2001-12-11 17:20 ` H . J . Lu
2001-12-11 23:43 ` H . J . Lu
2001-12-12 8:29 ` Andrea Arcangeli
2001-12-12 23:38 ` H . J . Lu
2001-12-12 23:49 ` Andrea Arcangeli
2001-12-13 0:11 ` H . J . Lu
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