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 14:43:35 +0200
From:	Zoltan Boszormenyi <zboszor@...aweb.hu>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	support@...lbox.intel.com
Subject: Re: Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH

Justin Piszcz írta:
>
>
> On Wed, 30 May 2007, Zoltan Boszormenyi wrote:
>
>> 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
>>
>
> I see, so Intel 965 motherboards do not work with 8GB of memory?  Or 
> is this a Linux issue?

It was certainly a mainboard problem, the same system worked well
on another board with a more capable L2 cache controller.
Or on PPro/P-II boards.

> I have an Intel Case ID open 225446 but so far we have not gotten 
> anywhere with this problem.  Currently I have 8GB in the machine and 
> boot with mem=4096M.  Was there any type of fix?  Any recommendations 
> as to what I can do?  Continue to speak with Intel?  Or perhaps 
> someone with more knowledge of the kernel and chime in as to what 
> exactly is happening here?
>
> Justin.

I think continue to talk Intel and with the kernel guys,
I don't have experience with machines with so much memory (yet).

Best regards,
Zoltán Böszörményi

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