Re: Industry db benchmark result on recent 2.6 kernels

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Linus Torvalds wrote:

On Fri, 1 Apr 2005, Chen, Kenneth W wrote:

Paul, you definitely want to check this out on your large numa box.  I booted
a kernel with this patch on a 32-way numa box and it took a long .... time
to produce the cost matrix.


Is there anything fundamentally wrong with the notion of just initializing
the cost matrix to something that isn't completely wrong at bootup, and
just lettign user space fill it in?


That's probably not a bad idea. You'd have to do things like
set RT scheduling for your user tasks, and not have any other
activity happening. So that effectively hangs your system for
a while anyway.

But if you run it once and dump the output to a config file...

Anyway we're faced with the immediate problem of crap performance
for 2.6.12 (for people with 1500 disks), so an in-kernel solution
might be better in the short term. I'll see if we can adapt Ingo's
thingy with something that is "good enough" and doesn't take years
to run on a 512 way.

Nick

--
SUSE Labs, Novell Inc.

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