Date: Thu, 10 Apr 2008 13:52:28 -0700 From: Maxim Sobolev <sobomax@FreeBSD.org> To: Kris Kennaway <kris@FreeBSD.org> Cc: gnn@FreeBSD.org, current@FreeBSD.org Subject: Re: TSC Timecounter and multi-core/SMP Message-ID: <47FE7E0C.4070801@FreeBSD.org> In-Reply-To: <47FDDE3A.8020900@FreeBSD.org> References: <m2d4oy8n30.wl%gnn@neville-neil.com> <47FDDE3A.8020900@FreeBSD.org>
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Kris Kennaway wrote: > gnn@freebsd.org wrote: >> Howdy, >> >> Is the TSC timecounter synchronized across multiple cores and/or >> processors? A quick search seems to indicate it's not but I'd like to >> find a definitive reference on the TSC. > > Modern Intel systems tend to be synchronized, in my experience. I really doubt they are. As far as I know newest milti-core chips can modulate frequency of even suspend individual cores independently of each other, which would make such synchronization difficult to maintain if the power management is on. -Maxim
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