From: Andrew Clayton <andrew@digital-domain.net>
To: John Stoffel <john@stoffel.org>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>,
David Rees <drees76@gmail.com>, Andrew Clayton <andrew@pccl.info>,
linux-raid@vger.kernel.org
Subject: Re: RAID 5 performance issue.
Date: Fri, 5 Oct 2007 20:42:07 +0100 [thread overview]
Message-ID: <20071005204207.2d338375@alpha.digital-domain.net> (raw)
In-Reply-To: <18182.35390.419883.646409@stoffel.org>
On Fri, 5 Oct 2007 15:02:22 -0400, John Stoffel wrote:
>
> How much memory does this system have? Have you checked the output of
2GB
> /proc/mtrr at all? There' have been reports of systems with a bad
$ cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1
> BIOS that gets the memory map wrong, causing access to memory to slow
> down drastically.
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000007fff0000 (usable)
BIOS-e820: 000000007fff0000 - 000000007ffff000 (ACPI data)
BIOS-e820: 000000007ffff000 - 0000000080000000 (ACPI NVS)
BIOS-e820: 00000000ff780000 - 0000000100000000 (reserved)
full dmesg (from 2.6.21-rc8-git2) at
http://digital-domain.net/kernel/sw-raid5-issue/dmesg
> So if you have 2gb of RAM, try booting with mem=1900m or something
Worth a shot.
> like that and seeing if things are better for you.
>
> Make sure your BIOS is upto the latest level as well.
Hmm, I'll see whats involved in that.
> John
Cheers,
Andrew
next prev parent reply other threads:[~2007-10-05 19:42 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-03 9:53 RAID 5 performance issue Andrew Clayton
2007-10-03 16:43 ` Justin Piszcz
2007-10-03 16:48 ` Justin Piszcz
2007-10-03 20:10 ` Andrew Clayton
2007-10-03 20:16 ` Justin Piszcz
2007-10-06 12:30 ` Justin Piszcz
2007-10-06 16:05 ` Justin Piszcz
2007-10-03 20:19 ` Andrew Clayton
2007-10-03 20:35 ` Justin Piszcz
2007-10-03 20:46 ` Andrew Clayton
2007-10-03 20:36 ` David Rees
2007-10-03 20:48 ` Andrew Clayton
2007-10-04 14:08 ` Andrew Clayton
2007-10-04 14:09 ` Justin Piszcz
2007-10-04 14:10 ` Justin Piszcz
2007-10-04 14:44 ` Andrew Clayton
2007-10-04 16:20 ` Justin Piszcz
2007-10-04 18:26 ` Andrew Clayton
2007-10-05 10:25 ` Justin Piszcz
2007-10-05 10:57 ` Andrew Clayton
2007-10-05 11:08 ` Justin Piszcz
2007-10-05 12:53 ` Andrew Clayton
2007-10-05 13:18 ` Justin Piszcz
2007-10-05 13:30 ` Andrew Clayton
2007-10-05 14:07 ` Justin Piszcz
2007-10-05 14:32 ` Andrew Clayton
2007-10-05 16:10 ` Andrew Clayton
2007-10-05 16:16 ` Justin Piszcz
2007-10-05 19:33 ` Andrew Clayton
2007-10-05 18:58 ` Richard Scobie
2007-10-05 19:02 ` Justin Piszcz
2007-10-05 19:02 ` John Stoffel
2007-10-05 19:42 ` Andrew Clayton [this message]
2007-10-05 20:56 ` John Stoffel
2007-10-07 17:22 ` Andrew Clayton
2007-10-11 17:06 ` Bill Davidsen
2007-10-11 18:07 ` Andrew Clayton
2007-10-11 23:43 ` Justin Piszcz
2007-10-04 14:36 ` Andrew Clayton
2007-10-04 14:39 ` Justin Piszcz
2007-10-04 15:03 ` Andrew Clayton
2007-10-04 16:19 ` Justin Piszcz
2007-10-04 19:01 ` Andrew Clayton
2007-10-04 16:46 ` Steve Cousins
2007-10-04 17:06 ` Steve Cousins
2007-10-04 19:06 ` Andrew Clayton
2007-10-05 10:20 ` Justin Piszcz
2007-10-04 14:39 ` Justin Piszcz
2007-10-03 17:53 ` Goswin von Brederlow
2007-10-03 20:20 ` Andrew Clayton
2007-10-03 20:48 ` Richard Scobie
2007-10-05 20:25 ` Brendan Conoboy
2007-10-06 0:38 ` Dean S. Messing
2007-10-06 8:18 ` Justin Piszcz
2007-10-08 1:40 ` Dean S. Messing
2007-10-08 8:44 ` Justin Piszcz
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