lkml.org 
[lkml]   [2007]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1]
Thomas Gleixner wrote:
>
> Here is the reason. The local APIC stops working in C3 state and we fall
> back to the PIT in that case. Not really exciting for dynticks, but the
> only way to keep the system alive. There is a patch coming up from
> Intel, which finds out how to use HPET even if it is not enabled by the
> BIOS. This will still end up on IRQ#0, but will give way longer idle
> sleeps than the PIT.
>
>

So then the next two questions are; is it possible to disable C3 and is
it a net power gain to get rid of the wakeups in favor of having C3.

Rgds

--
-- Pierre Ossman

Linux kernel, MMC maintainer http://www.kernel.org
PulseAudio, core developer http://pulseaudio.org
rdesktop, core developer http://www.rdesktop.org

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-02-22 17:31    [W:0.163 / U:2.256 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site