Date: Wed, 24 Nov 2010 14:30:16 GMT From: Andriy Gapon <avg@freebsd.org> To: freebsd-amd64@FreeBSD.org Subject: Re: amd64/152405: wrong user time is reported when CPU frequency throttled. Message-ID: <201011241430.oAOEUG4i026180@freefall.freebsd.org>
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The following reply was made to PR amd64/152405; it has been noted by GNATS. From: Andriy Gapon <avg@freebsd.org> To: =?UTF-8?B?IktPSUUgSGlkZXRha2EgKOmvieaxn+iLsemahu+8oOaVsOeQhuaKgOeglCki?= <koie@suri.co.jp> Cc: bug-followup@freebsd.org Subject: Re: amd64/152405: wrong user time is reported when CPU frequency throttled. Date: Wed, 24 Nov 2010 16:19:24 +0200 on 24/11/2010 15:54 Andriy Gapon said the following: > Anyway, it seems that I missed the real cause of this problem and the excellent > explanation by Bruce. Could you please try the following (work-in-progress) patch? http://people.freebsd.org/~avg/tsc-cpu_ticks.diff I expect that it should improve accuracy for your testcase, but may penalize system performance to certain degree. As mav@ has said, performance, accuracy, powerstate management - pick any two of the three. OTOH, I am not sure by how much the performance could be affected. -- Andriy Gaponhome | help
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