Date: Wed, 18 Oct 2006 20:09:32 +0200 From: "Attilio Rao" <attilio@freebsd.org> To: "Kian Mohageri" <kian.mohageri@gmail.com>, "Ivan Voras" <ivoras@fer.hr>, freebsd-smp@freebsd.org Subject: Re: xeon 2.8GHz SMP/NOT test results Message-ID: <3bbf2fe10610181109s5176bf9fk4c0b32210d923661@mail.gmail.com> In-Reply-To: <fee88ee40610161359t537c2768tacd5d8192befe688@mail.gmail.com> References: <fee88ee40610151610g4af70cbfi1b79ed256cc78995@mail.gmail.com> <fee88ee40610161115y5df70233te4f403c55331962c@mail.gmail.com> <4533EE53.9010603@fer.hr> <fee88ee40610161359t537c2768tacd5d8192befe688@mail.gmail.com>
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2006/10/16, Kian Mohageri <kian.mohageri@gmail.com>: > On 10/16/06, Ivan Voras <ivoras@fer.hr> wrote: > > > > Ok, but take care so that the machine is *completely* idle while you > > doing the tests, otherwise they don't mean anything. > > > > > Understood. > > I noticed somebody suggested trying SMP with hyperthreading disabled in the > BIOS, and I'm a little bit confused as to what sort of results should I > expect from that. Could anybody enlighten me about how the OS will see/make > use of this? > > My next test(s) will probably be: > > - "SMP w/ HTT" vs. "GENERIC w/ HTT disabled in BIOS" vs. "SMP w/ HTT > disabled in BIOS" > - both lmsensors and unixbench tests > - timecounter comparisons I think that you might do a real comparison using the same kernel w/ only these slight differences (read: not using GENERIC vs. custom-kernel): disable HTT in BIOS: - kernel w/o SMP (w/o PREEMPTION+FULL_PREEMPTION) - kernel w/ SMP (w/o PREEMPTION+FULL_PREEMPTION) - kernel w/o SMP (w/ PREEMPTION+FULL_PREEMPTION) - kernel w/ SMP (w/ PREEMPTION+FULL_PREEMPTION) enable HTT in BIOS, active HTT in the kernel and do again these tests (you might have an 8 cases situation to show). Attilio -- Peace can only be achieved by understanding - A. Einstein
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