Date: Sat, 24 Jul 2010 11:58:56 -0500 From: Alan Cox <alan.l.cox@gmail.com> To: Alexander Motin <mav@freebsd.org> Cc: freebsd-hackers@freebsd.org, freebsd-performance@freebsd.org Subject: Re: Intel TurboBoost in practice Message-ID: <AANLkTi=XFBOc30zNjC-DOCtxsHUnozvDX4ABMJ_354Re@mail.gmail.com> In-Reply-To: <4C4AF046.40507@FreeBSD.org> References: <4C4AF046.40507@FreeBSD.org>
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2010/7/24 Alexander Motin <mav@freebsd.org> > Hi. > > I've make small observations of Intel TurboBoost technology under > FreeBSD. This technology allows Intel Core i5/i7 CPUs to rise frequency > of some cores if other cores are idle and power/thermal conditions > permit. CPU core counted as idle, if it has been put into C3 or deeper > power state (may reflect ACPI C2/C3 states). So to reach maximal > effectiveness, some tuning may be needed. > > [snip] > > PPS: I expect even better effect achieved by further reducing interrupt > rates on idle CPUs. > > I'm currently testing a patch that eliminates another 31% of the global TLB shootdowns for a "buildworld" on an amd64 machine. So, you can expect improvement in this area. Alan
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