Date: Mon, 9 May 2005 13:21:11 -0400 From: Ewan Todd <ewan@mathcode.net> To: Scott Long <scottl@samsco.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Performance issue Message-ID: <20050509172111.GH281@mathcode.net> In-Reply-To: <427F9890.7010104@samsco.org> References: <20050509150018.GF281@mathcode.net> <427F8076.7030105@samsco.org> <20050509170316.GG281@mathcode.net> <427F9890.7010104@samsco.org>
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> > 5.3 ships with SMP turned on, which makes lock operations rather > expensive on single-processor machines. 4.x does not have SMP > turned on by default. Would you be able to re-run your test with > SMP turned off? > I'm pretty sure there's no SMP in this kernel. #cd /usr/src/sys/i386/conf #fgrep SMP MYKERNEL # GENERIC has no SMP in it, but there's a second "GENERIC" kernel conf called "SMP", which simply says: include GENERIC options SMP However, sysctl seems to show smp not active, but not disabled. Is that anything to worry about? #sysctl -a | grep smp kern.smp.maxcpus: 1 kern.smp.active: 0 kern.smp.disabled: 0 kern.smp.cpus: 1 debug.psmpkterrthresh: 2 -e
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