Date: Tue, 31 May 2011 14:18:26 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Jung-uk Kim <jkim@FreeBSD.org> Cc: freebsd-hackers@FreeBSD.org Subject: Re: [RFC] Enabling invariant TSC timecounter on SMP Message-ID: <4DE4CE82.4030301@FreeBSD.org> In-Reply-To: <201105241356.45543.jkim@FreeBSD.org> References: <201105241356.45543.jkim@FreeBSD.org>
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on 24/05/2011 20:56 Jung-uk Kim said the following: > I think it's about time to enable invariant TSC timecounter on SMP by > default. Please see the attached patch. It is also available from > here: > > http://people.freebsd.org/~jkim/tsc_smp_test4.diff > > avg convinced me enough that it should be an opt-out feature going > forward. :-) Not sure if I really did that. My position is this: - if we think that TSC is SMP-safe then it should have the best priority - we should do our best to auto-guess if TSC is SMP-safe unless a user explicitly overrides that property (either via explicit testing or by making guesses based on CPU model or etc) > Comments? Perhaps I missed it, but I don't remember the "lowres" part of the patch being discussed. -- Andriy Gapon
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