Messages in this thread | | | Date | Sat, 26 Dec 2009 10:38:35 +0100 | From | Arjan van de Ven <> | Subject | Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28 |
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On Fri, 25 Dec 2009 21:33:04 +0100 Andi Kleen <andi@firstfloor.org> wrote:
> On Fri, Dec 25, 2009 at 01:21:16PM +0100, Arjan van de Ven wrote: > > On Wed, 23 Dec 2009 18:08:32 +0100 > > Andi Kleen <andi@firstfloor.org> wrote: > > > > > I removed that code when moving to 64bit (floppy driver disabling > > > C1), but perhaps we need some variant of it again (but it's the > > > first such report in many years). Although it would be sad to > > > have it again on all systems. > > > > at least now we have the pmqos infrastructure, driver just needs to > > ask for 0 latency ;) > > Does pmqos work with apci=off etc.?
yes
> I didn't think it shut down > the classic "HLT" idle, does it?
it does if you specify a latency of 0; it will then go into the spin-only state until you give up your latency requirement
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
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