Date: Thu, 09 Jul 2009 21:43:35 +0300 From: Andriy Gapon <avg@freebsd.org> To: =?ISO-8859-1?Q?Marius_N=FCnnerich?= <marius@nuenneri.ch> Cc: freebsd-current@freebsd.org Subject: Re: dtrace users opinion solicited (timestamps) Message-ID: <4A563A57.8090907@freebsd.org> In-Reply-To: <b649e5e0907091102h2bbf3799r4f8b840696a9162b@mail.gmail.com> References: <4A562960.3010801@freebsd.org> <b649e5e0907091102h2bbf3799r4f8b840696a9162b@mail.gmail.com>
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on 09/07/2009 21:02 Marius Nünnerich said the following: > What about atomically changing tsc_freq every time the frequency is changed? This is what actually does happen, but it doesn't help. Say, there is a moment T1 when TSC has value N and tsc_freq is X, and moment T2 when when TSC value (N + 1) and tsc_freq is 10*X. So the formula gives: t1 = N / X t2 = (N+1) / (10*X) -- Andriy Gapon
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