Date: Fri, 16 May 2003 09:34:53 +0300 From: Petri Helenius <pete@he.iki.fi> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-smp@freebsd.org Subject: Re: Strange systat output on SMP FreeBSD 5.0-Current Message-ID: <3EC4868D.8030409@he.iki.fi> In-Reply-To: <20030515213906.GO23782@dan.emsphone.com> References: <XFMail.20030515164618.jhb@FreeBSD.org> <068401c31b23$9c4d1ad0$c02a40c1@PETEX31> <20030515213906.GO23782@dan.emsphone.com>
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Dan Nelson wrote: >per-cpu utilization should be even across all CPUs, since our >schedulers do not do process affinity and are not HT-aware. > > > That would be true if there would be no interrupts and no kernel time. With them the system spends more time with one/some of the CPU's. (or systat lies, but I don't think so) This is also why HT does not perform well if you have a lot of activity that is behind an exclusive lock. Pete
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