Messages in this thread |  | | Date | Tue, 22 Mar 2011 08:49:58 -0700 | From | Jesse Barnes <> | Subject | Re: intel_ips produces constant load of 1 |
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On Tue, 22 Mar 2011 08:00:39 +0100 Andreas Hartmann <andihartmann@freenet.de> wrote:
> Jesse Barnes wrote: > > On Sat, 19 Mar 2011 16:38:38 +0100 > > Andreas Hartmann <andihartmann@01019freenet.de> wrote: > > > >> Hello, > >> > >> on my MSI CR620 laptop, intel_ips produces a constant load of 1, even if > >> the machine is idle. > >> > >> The ips-monitor hangs in D state: > >> > >> ps aux | grep ips > >> root 593 0.0 0.0 0 0 ? S 17:20 0:00 > >> [ips-adjust] > >> root 594 0.0 0.0 0 0 ? D 17:20 0:00 > >> [ips-monitor] > >> > >> If the module isn't loaded, the load of the machine in idle mode is 0 as > >> expected. > > > > This is a reporting problem, and probably due to the schedule() call > > and associated task state in the ips-monitor thread. I thought setting > > the task state to interruptible would prevent this, but it seems like > > it's not enough for the deferrable on-stack timers? > > > > At any rate, it's not actually causing increased CPU usage, so you can > > safely ignore it until we have a fix. > > > > I've got one more question (I found > http://forum.soft32.com/linux/RFC-Intelligent-power-sharing-driver-ftopict510146.html): > > Where is the difference to the functionality the bios provides? I can't > see (and hear :-)) any difference between with intel_ips and without > intel_ips. > The fan always runs at a minimal speed, very quiet. > The fan is getting loader, if the load is getting high (during > compile-sessions e.g.). If the compile session is ready, the fan get's > slower again. > > If I check the "cpu MHz" in /proc/cpuinfo with or without intel_ips, I > can't see any difference. The value never exceeds the value given in the > model name. The lowest values are equal, too. > > > What is the added value compared to the bios functionality? How can I > check it?
Loading the IPS driver will allow graphics turbo. This can improve gfx performance quite a bit (up to 3x on some synthetic workloads). If you're not really using gfx though, the driver won't really do anything for you.
-- Jesse Barnes, Intel Open Source Technology Center
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