>-----Original Message----- >From: linux-kernel-owner@xxxxxxxxxxxxxxx >[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of Pierre Ossman >Sent: Thursday, March 13, 2008 9:35 AM >To: Len Brown >Cc: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx; Pavel Machek; LKML; >Adam Belay; Andi Kleen; Lee Revell >Subject: Re: [PATCH] cpuidle: avoid singing capacitors > >On Wed, 12 Mar 2008 15:11:17 -0400 >Len Brown <lenb@xxxxxxxxxx> wrote: > >> > >> > So for now, the only viable workaround is processor.max_cstate.... >> >> yup, that's why we put it in. Is it insufficient? >> > >For some value of insufficient. It is sub-optimal. I'm hoping >there is a way to enter C3 in a pattern that avoids the noise >and still gives a reduced power usage. > Can you try using /dev/cpu_dma_latency from an user space application. Refer Documentation/pm_qos_interface.txt for usage. With this interface you can change menu governor behavior from userspace, by dynamically allowing it to use C3 or not. I am thinking that something like allowing C3 for few seconds and blocking it for few seconds may help. Thanks, Venki _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
