Re: [stable] [PATCH 1/2 2.6.37.stable] intel_idle: disable NHM/WSM HW C-state auto-demotion

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> On Wed, 23 Mar 2011, Greg KH wrote:
> 
> > On Tue, Mar 22, 2011 at 10:24:43PM -0400, Len Brown wrote:
> > > From: Len Brown <len.brown@xxxxxxxxx>
> > > 
> > > upstream 14796fca2bd22acc73dd0887248d003b0f441d08
> > > 
> > > Hardware C-state auto-demotion is a mechanism where the HW overrides
> > > the OS C-state request, instead demoting to a shallower state,
> > > which is less expensive, but saves less power.
> > > 
> > > Modern Linux should generally get exactly the states it requests.
> > > In particular, when a CPU is taken off-line, it must not be demoted, else
> > > it can prevent the entire package from reaching deep C-states.
> > > 
> > > https://bugzilla.kernel.org/show_bug.cgi?id=25252
> > > 
> > > Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
> > 
> > This patch doesn't apply to the .38-stable tree, and it also needs to go
> > there, right?  Can you please send a version that I can apply?
> 
> it is already present in 2.6.38, as is the next one.
> That is why the subject specified 2.6.37.stable.

Why is it stable material? Seems like small power optimalization to me...

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
_______________________________________________
linux-pm mailing list
linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/linux-pm


[Index of Archives]     [Linux ACPI]     [Netdev]     [Ethernet Bridging]     [Linux Wireless]     [CPU Freq]     [Kernel Newbies]     [Fedora Kernel]     [Security]     [Linux for Hams]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux Admin]     [Samba]

  Powered by Linux