Date: Sun, 14 Feb 1999 23:02:56 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: hackers@FreeBSD.ORG Subject: Re: Processor affinity? Message-ID: <Pine.LNX.4.04.9902142257150.29571-100000@feral-gw> In-Reply-To: <199902150650.WAA12919@apollo.backplane.com>
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> > The only issue with processor affinity, really, is the actual load on > the main memory. Processor affinity only makes sense when the load on > main memory is relatively high. Typically, SMP systems have a relatively > low main memory load ( and high L1 and L2 cache memory load ), so until > you have enough cpu's banging on the same main memory to saturate it, > processor affinity is usually wash. It makes sense on a big 32+ cpu > Solaris or SGI system, but not much sense on a 2 or 4 cpu system. Right- I think I knew this. I guess I'm dating myself in that I kept on thinking of how useful processor affinity was on the Kubota (aka 'Ardent') 4 banger MIPS-3000 machines- but the cache architectures of this machine is much more like the SGI systems than the 4 way SMP machines you describe. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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