linux-kernel - Re: Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH

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Date:	Wed, 30 May 2007 11:28:32 +0200
From:	Zoltan Boszormenyi <zboszor@...aweb.hu>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	Justin Piszcz <jpiszcz@...idpixels.com>
Subject: Re: Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH

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

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