Date: Sat, 8 Jan 2000 15:26:31 -0600 (CST) From: Mohit Aron <aron@cs.rice.edu> To: wes@softweyr.com (Wes Peters) Cc: freebsd-net@freebsd.org Subject: Re: performance of FreeBSD-current as SMP Message-ID: <200001082126.PAA17320@cs.rice.edu> In-Reply-To: <3877AB9F.E132C12C@softweyr.com> from "Wes Peters" at Jan 8, 2000 02:26:55 pm
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> > Not if defining SMP support causes the kernel to compile in all of the lock > acquisition and release code. Even if it simply does "if (ncpus < 2) return" > it would still impact performance somewhat. > Right, but the fall shouldn't be as much as 22%. According to Garret's earlier posting, there seem to be some very expensive Intel instructions being used for locking. Or possibly, the lock acquisition is done at too many places. - Mohit To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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