High pitch noise when ACPI processor module is loaded.
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From: Justin Piszcz on 25 Jan 2010 05:00 On Mon, 25 Jan 2010, Justin Piszcz wrote: > Hi, > > I think something else may be wrong? > > I switched my kernel config to 100 HZ and the problem persists. > > So the question remains, is it possible to utilize turbo boost (in Linux) > without the high pitch noise from the ACPI processor module? > > Again, when the module is not loaded, no matter what HZ, there is no high > pitch noise. > > Justin. > > Without ACPI processor module loaded, turbo boost never takes effect: (turbostat) CPU GHz TSC %c0 %c1 %c3 %c6 %pc3 %pc6 %pc7 0 2.93 2.93 1.41 98.59 0.00 0.00 0.00 0.00 0.00 1 2.93 2.93 100.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.93 2.93 1.51 98.49 0.00 0.00 0.00 0.00 0.00 3 2.93 2.93 0.97 99.03 0.00 0.00 0.00 0.00 0.00 4 2.93 2.93 0.90 99.10 0.00 0.00 0.00 0.00 0.00 5 2.93 2.93 0.34 99.66 0.00 0.00 0.00 0.00 0.00 6 2.93 2.93 0.40 99.60 0.00 0.00 0.00 0.00 0.00 7 2.93 2.93 3.07 96.93 0.00 0.00 0.00 0.00 0.00 With the module loaded, it works but there is a high pitch noise, again, only under Linux, when the same benchmark (bzip2 a file) is run under windows there is no high pitch noise: CPU GHz TSC %c0 %c1 %c3 %c6 %pc3 %pc6 %pc7 0 3.30 2.93 0.44 0.82 25.29 73.44 0.00 0.00 0.00 1 3.33 2.93 0.24 1.02 25.29 73.44 0.00 0.00 0.00 2 3.43 2.93 1.84 5.41 48.65 44.10 0.00 0.00 0.00 3 3.41 2.93 0.49 6.76 48.65 44.10 0.00 0.00 0.00 4 3.58 2.93 99.44 0.56 0.00 0.00 0.00 0.00 0.00 5 3.43 2.93 0.03 99.97 0.00 0.00 0.00 0.00 0.00 6 3.09 2.93 0.14 0.23 89.74 9.89 0.00 0.00 0.00 7 2.13 2.93 0.01 0.36 89.74 9.89 0.00 0.00 0.00 Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Ian Campbell on 25 Jan 2010 05:20 On Mon, 2010-01-25 at 04:26 -0500, Justin Piszcz wrote: > So the question remains, is it possible to utilize turbo boost (in Linux) > without the high pitch noise from the ACPI processor module? I have to use the max_cstate=2 option to processor.ko in order to not have a similar high pitch noise. I suppose you might get away higher values of max_cstate depending on your hardware. Battery life doesn't seem to be too adversely impacted. Ian. -- Ian Campbell Current Noise: Ephel Duath - Ruins (Deep Blue And Violet) Hmm... Which would do a better job at driving physicists crazy? Travel faster than light, or a floating-point boolean value? -- Michael Mol -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Henrique de Moraes Holschuh on 25 Jan 2010 07:40 On Mon, 25 Jan 2010, Justin Piszcz wrote: > So the question remains, is it possible to utilize turbo boost (in Linux) > without the high pitch noise from the ACPI processor module? Well, I am tempted to say you should consider getting a higher quality motherboard (or, if it is just yours that sing, get it replaced on warranty as that would mean you got one with bad components). That said, if Windows can get that motherboard to shut up, so should Linux. You just need to find the right knob to push that will make the power draw behaviour more like whatever Windows is doing. The first good bet is to limit core C-state depth, e.g, to C3 (instead of C5/C6), and if thet doesn't work, to C2. After that, you can try limiting package C-states if your BIOS will let you (I don't know if we can do that distinction in Linux right now... do we?), play with cpufreq limiting the core frequency changes, etc. And of course, try all scheduler frequencies, with and without NO_HZ. What motherboard is this? -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Justin Piszcz on 25 Jan 2010 07:50 On Mon, 25 Jan 2010, Henrique de Moraes Holschuh wrote: > On Mon, 25 Jan 2010, Justin Piszcz wrote: >> So the question remains, is it possible to utilize turbo boost (in Linux) >> without the high pitch noise from the ACPI processor module? > > Well, I am tempted to say you should consider getting a higher quality > motherboard (or, if it is just yours that sing, get it replaced on warranty > as that would mean you got one with bad components). > > That said, if Windows can get that motherboard to shut up, so should Linux. > You just need to find the right knob to push that will make the power draw > behaviour more like whatever Windows is doing. > > The first good bet is to limit core C-state depth, e.g, to C3 (instead of > C5/C6), and if thet doesn't work, to C2. After that, you can try limiting > package C-states if your BIOS will let you (I don't know if we can do that > distinction in Linux right now... do we?), play with cpufreq limiting the > core frequency changes, etc. > > And of course, try all scheduler frequencies, with and without NO_HZ. > > What motherboard is this? Intel's DP55KG Extreme motherboard, yes I will try changing the c-state later and hopefully that will fix the problem, thanks. Again, the board never makes any noise in the BIOS or Windows or Linux, only when you load the cpufreq-processor module. Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Justin Piszcz on 25 Jan 2010 15:50
On Mon, 25 Jan 2010, Ian Campbell wrote: > On Mon, 2010-01-25 at 04:26 -0500, Justin Piszcz wrote: >> So the question remains, is it possible to utilize turbo boost (in Linux) >> without the high pitch noise from the ACPI processor module? > > I have to use the max_cstate=2 option to processor.ko in order to not > have a similar high pitch noise. I suppose you might get away higher > values of max_cstate depending on your hardware. Battery life doesn't > seem to be too adversely impacted. Hello, I tried this, but then the max speed bin is only 3.2GHz instead of 3.6GHz, it does solve the problem but limits the CPU quite a bit, see below: CPU GHz TSC %c0 %c1 %c3 %c6 %pc3 %pc6 %pc7 0 3.20 2.93 0.33 99.67 0.00 0.00 0.00 0.00 0.00 1 3.20 2.93 0.09 99.91 0.00 0.00 0.00 0.00 0.00 2 3.20 2.93 100.00 0.00 0.00 0.00 0.00 0.00 0.00 3 3.20 2.93 0.95 99.05 0.00 0.00 0.00 0.00 0.00 4 3.20 2.93 0.08 99.92 0.00 0.00 0.00 0.00 0.00 5 3.20 2.93 0.02 99.98 0.00 0.00 0.00 0.00 0.00 6 3.20 2.93 0.06 99.94 0.00 0.00 0.00 0.00 0.00 7 3.20 2.93 0.01 99.99 0.00 0.00 0.00 0.00 0.00 -- It would be nice if it were possible to find out what is causing it exactly in the acpi cpufreq module, as this problem does not occur in Windows 7 and I can achieve 3.6GHz in Windows 7 w/out any high pitch noise. Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |