Re: [stable] [PATCH] Enable bit 11 in _PDC to advertise hw coord

[Greg KH <greg@kroah.com>]

On Wed, Feb 04, 2009 at 12:40:36PM -0800, Greg KH wrote:
> On Wed, Feb 04, 2009 at 12:06:42PM -0800, Pallipadi, Venkatesh wrote:
> > On Wed, 2009-02-04 at 11:53 -0800, Henrique de Moraes Holschuh wrote:
> > > On Wed, 04 Feb 2009, Jens Axboe wrote:
> > > > On Mon, Feb 02 2009, Pallipadi, Venkatesh wrote:
> > > > > 
> > > > > Bit 11 in intel PDC definitions is meant for OS capability to handle
> > > > > hardware coordination of P-states. In Linux we have always supported
> > > > > hwardware coordination of P-states. Just let the BIOSes know that we
> > > > > support it, by setting this bit.
> > > > > 
> > > > > Some BIOSes use this bit to choose between hardware or software coordination
> > > > > and without this change below, BIOSes switch to software coordination, which
> > > > > is not very optimal in terms of power consumption and extra wakeups from idle.
> > > > 
> > > > I can confirm that this fixes the excessive reschedule ipi count on an
> > > > x60 with the ondemand governor. Can we please get this into 2.6.29?
> > > 
> > > And, after that, -stable?
> > > 
> > 
> > Agreed. This should also go to -stable once it gets into mainline.
> 
> Can someone send stable@kernel.org the git commit id when it goes into
> Linus's tree?

It's d96f94c604453f87fe24154b87e1e9a3a72511f8, I got it now.

thanks,

greg k-h