From: Zoltan Boszormenyi <zboszor@dunaweb.hu>
To: linux-kernel <linux-kernel@vger.kernel.org>,
Justin Piszcz <jpiszcz@lucidpixels.com>
Subject: Re: Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH
Date: Wed, 30 May 2007 11:28:32 +0200 [thread overview]
Message-ID: <465D43C0.60609@dunaweb.hu> (raw)
Hi,
> Look at how slow the raid benchmarks are in dmesg with 8GB of memory!
>
> [ 59.592560] raid6: using algorithm sse2x4 (476 MB/s)
> [ 59.597558] raid5: using function: generic_sse (56.000 MB/sec)
>
> Yikes!
>
> With mem=4096M:
> [ 60.336352] raid6: using algorithm sse2x4 (6804 MB/s)
> [ 60.341345] raid5: using function: generic_sse (8552.000 MB/sec)
>
> What is going on here?
>
> Justin.
I saw a similar effect on a P5 board that could
only cache 64MB of memory a long time ago.
Putting more memory into it made the machine slower
and e.g. made the sym2 driver giving up at initialization.
Maybe it's a modern reincarnation of the problem?
Best regards,
Zoltán Böszörményi
next reply other threads:[~2007-05-30 9:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-30 9:28 Zoltan Boszormenyi [this message]
2007-05-30 11:15 ` Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH Justin Piszcz
2007-05-30 12:43 ` Zoltan Boszormenyi
2007-05-30 14:24 ` Case: 225446: Linux " Justin Piszcz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=465D43C0.60609@dunaweb.hu \
--to=zboszor@dunaweb.hu \
--cc=jpiszcz@lucidpixels.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox