On Wed, 30 May 2007, Justin Piszcz wrote:
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?
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.
Adding Intel to CC list.
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