Date: Sat, 30 May 2009 20:55:21 -0700 From: Kip Macy <kmacy@freebsd.org> To: bf <bf2006a@yahoo.com> Cc: attilio@freebsd.org, ohartman@mail.zedat.fu-berlin.de, freebsd-current@freebsd.org Subject: Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64 Message-ID: <3c1674c90905302055g542cfadarf201cc273639977d@mail.gmail.com> In-Reply-To: <951233.95131.qm@web39108.mail.mud.yahoo.com>
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> > I'm running the r193133 amd64 with a custom kernel and all debugging off > on an AMD Athlon64 3400+ single-core, and I haven't noticed any significant > slowing, although I haven't been doing any systematic benchmarking. > > What would be the penalties of running an SMP -CURRENT kernel on > single-core hardware with no hyperthreading? Can anyone quantify the > typical added overhead? Or, counterintuitively, would an SMP kernel > be better in some ways? > He is trying to diagnose if the problem was introduced by enabling adaptive spinning on sx locks. They're only enabled on SMP kernels. Cheers, Kiphome | help
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