Date: Wed, 17 Nov 2010 22:53:38 -0500 From: George Neville-Neil <gnn@neville-neil.com> To: Andriy Gapon <avg@FreeBSD.org> Cc: freebsd-acpi@freebsd.org, freebsd-current@freebsd.org Subject: Re: aperf/mperf Message-ID: <D1DB20AD-779E-469B-BFFA-C0BA1A249858@neville-neil.com> In-Reply-To: <4CE29718.2050508@freebsd.org> References: <4CE29718.2050508@freebsd.org>
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On Nov 16, 2010, at 09:37 , Andriy Gapon wrote: >=20 > Many modern processors provide APERF and MPERF MSRs which allow to = easily and > reliable calculate average CPU performance level over some interval of = time. > This also allows to notice things like performance boost, which is = generally > hidden from software. > What would be a proper place to add code that would measure = APERF/MPERF ratio? > When should trigger such a measurement and over what interval? > Ideas? Can you point me at documentation for this? This sounds a lot like hwpmc(4) and I wonder if we can make these available in the same way. Best, George
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