Date: Sun, 11 Jan 2004 00:40:03 +0900 (JST) From: Nakata Maho <chat95@mbox.kyoto-inet.or.jp> To: freebsd-amd64@freebsd.org Subject: Opteron 4+0 or 4+2 dimm issue Message-ID: <20040111.004003.28786045.chat95@mbox.kyoto-inet.or.jp> In-Reply-To: <20040108180214.GA79495@dragon.nuxi.com> References: <20040107200042.67A0B16A4D2@hub.freebsd.org> <3FFCD437.6090704@citlink.net> <20040108180214.GA79495@dragon.nuxi.com>
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Hi, David
> I personally don't like any 4+0 DIMM configuration motherboard -- unless
> it is treated as a 1P Opteron 1xy AGP workstation. I.E. the K8T
> Master-FAR. 4+0 SMP configuration has NUMA performance issues that can't
> be worked around. Well, the board still has some merit when used as an
> SMP -- the memory latency across 1-hop is still better than today's
> Pentium-4 SMP systems.
I heard that HyperTransport (6.4G/sec?)
is fast enough so that NUMA is not necessary to implement.
can I ask some question?
in FreeBSD/amd64 with SMP, is it always true that for a process
runs at processor #1 allocates physical memory belongs also to
processor #1?
process A -------------------------> accesses DIMM#2
accesses DIMM#1 <-------------------------- process B
processor #1 --HyperTransport-- processor #2
| |
DIMM #1 DIMM #2
if total memory is 2G attached symmetrically, and if
a process allocates near 2G bytes, how physical memory is
allocated?
Regards,
maho
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