Date: Mon, 06 Dec 2010 20:56:32 +0200 From: Andriy Gapon <avg@freebsd.org> To: Jung-uk Kim <jkim@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: non-invariant tsc and cputicker Message-ID: <4CFD31E0.8070107@freebsd.org> In-Reply-To: <201012061334.22475.jkim@FreeBSD.org> References: <4CF92852.20705@freebsd.org> <201012061243.08577.jkim@FreeBSD.org> <4CFD2441.5090408@freebsd.org> <201012061334.22475.jkim@FreeBSD.org>
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on 06/12/2010 20:34 Jung-uk Kim said the following: > I understand that. However, it is not clear to me why you want to > pessimize performance of old hardware. If you can convince me old > hardware with slow timecounter hardware (e.g., i8254) does not hurt > too much, maybe it's okay. Overlooked this point - TSC can be very well used as a timecounter. And in that case non-invariant TSC would veto P-state changes, which is the proper thing to do, IMO. -- Andriy Gapon
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