Date: Wed, 16 Jun 2004 02:11:07 +0200 From: Ralf Baechle <ralf@linux-mips.org> To: Philippe St-Jacques <eukaryote@hotmail.com> Cc: freebsd-mips@FreeBSD.org Subject: Re: SGI - Origin 2000 Message-ID: <20040616001107.GA15817@linux-mips.org> In-Reply-To: <BAY9-F44vdrDPbAqOKS00011adc@hotmail.com> References: <BAY9-F44vdrDPbAqOKS00011adc@hotmail.com>
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On Tue, Jun 15, 2004 at 09:39:52PM +0000, Philippe St-Jacques wrote:
> Hi. I will have soon 2 SGI Origin 2000 racks in here and I'd really like to
> be informed about how well your work is progressing on those machines. Each
> rack has 16 R10000 processors clocked at 250 mhz each, with 4 gig ram.
In addition to the issues raised by Juli there also is the lack [1] of
ccNUMA support in FreeBSD. The SN0 architecture has a very low local to
remote memory latency ratio which tends to paper over the lack of such
OS support pretty well. Also OS ccNUMA support comes at a cost at not
too much possible gain for a 4 processor system. So scaling to 4
processors is not so much of an issue - it'll work more or less. Starting
from 8 processors things are getting a bit ugly for most workloads we did
test and even more so at 16. Don't get me started about scalability to a
midsize system of like 128 processors without well tuned NUMA support ;-)
Ralf
[1] Forgive if that has changed - I'm not following FreeBSD development
very much ...
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