From mboxrd@z Thu Jan 1 00:00:00 1970 From: Len Brown Subject: Re: Centrino question Date: 22 May 2004 23:20:09 -0400 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <1085282408.12353.730.camel@dhcppc4> References: <3ACA40606221794F80A5670F0AF15F8404622C57@PDSMSX403.ccr.corp.intel.com> <20040520015748.776d5b84.neurowork@free.fr> <1085111429.12352.563.camel@dhcppc4> <20040521125637.33f69fc6.neurowork@free.fr> <20040521115207.GA12775@hell.org.pl> <1085161136.9856.5.camel@Neuromancer.home.net> <20040521184830.GG31690@mh57.de> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20040521184830.GG31690-lb+GC1uVkU0@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Martin Hermanowski Cc: ACPI Developers List-Id: linux-acpi@vger.kernel.org On Fri, 2004-05-21 at 14:48, Martin Hermanowski wrote: > On Fri, May 21, 2004 at 10:38:57AM -0700, Ow Mun Heng wrote: > > On Fri, 2004-05-21 at 04:52, Karol Kozimor wrote: > > > Thus wrote Cyril Wattebled: > > > > However, I don't understand, I was told that the centrino processor and chipset > > > > supports C3 and even C4. > > > > C3 is Supported > > > > > > active state: C2 > > default state: C1 > > bus master activity: ffffffff > > states: > > C1: promotion[C2] demotion[--] latency[000] usage[01028830] > > *C2: promotion[C3] demotion[C1] latency[050] usage[04785987] > > C3: promotion[--] demotion[C2] latency[050] usage[00001327] > > > > This is a Dell D600 1.4g. c3 values are low because I have the USB mouse > > on right now. (note the fffffff??) > > The same here (ibm t41p, 1.7GHz). Using USB forces c2. But c1 seems to be used > very seldom (usage count of 10). Known issue with C1 and C2... When C2 has very low latency, say 1, then after we're in C1 10 times and promote to C2, we never demote to C1 again, ever. The processor driver is tracking how successful we are at being idle, but is not tracking how non-idle the system is, so our current demotion policy is somewhat simplistic. -Len ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click