Date: 22 Jun 1999 18:11:39 -0700 From: Arun Sharma <adsharma@home.com> To: freebsd-questions@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG Subject: Re: Multi processor support? Message-ID: <m3vhcfyb3o.fsf@c62443-a.frmt1.sfba.home.com> In-Reply-To: Terry Lambert's message of "Tue, 22 Jun 1999 18:35:27 %2B0000 (GMT)" References: <199906221835.LAA25521@usr05.primenet.com>
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Terry Lambert <tlambert@primenet.com> writes: > The best you are going to get is explicit division of tasks > between multiple processes. At *that* point (and *only* then) > does CPU affinity become a real issue. Even so, it's not an > issue addressed (IMO) by the Linux SMP implementation (any > more than the FreeBSD or BSDI implementations). Linux scheduler does implement processor affinity to some extent: #ifdef __SMP__ /* Give a largish advantage to the same processor... */ /* (this is equivalent to penalizing other processors) */ if (p->processor == this_cpu) weight += PROC_CHANGE_PENALTY; #endif A better way to do this would be to split the runnable process queues into per processor queues (ref: Digital's SMP implementation). Also, the ability to have multiple threads executing in a single address space, scheduled on different processors simultaneously is very significant. -Arun To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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