Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-23 Thread Peter Zijlstra
On Mon, May 23, 2016 at 10:00:04AM +0100, Lorenzo Pieralisi wrote: > It is also related to static leakage power that depends on the operating > voltage (ie higher operating frequencies require higher voltage) so in a > way scaling frequency before going idle may not be effective if voltage > does n

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-23 Thread Peter Zijlstra
On Sun, May 22, 2016 at 01:42:52PM -0700, Steve Muckle wrote: > > So does it actually matter what the frequency is when you idle? Isn't > > the whole thing clock gated anyway? > > > > Because this seems to generate contradictory requirements, on the one > > hand we want to stay idle as long as po

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-23 Thread Lorenzo Pieralisi
On Sun, May 22, 2016 at 01:42:52PM -0700, Steve Muckle wrote: > On Sun, May 22, 2016 at 12:39:12PM +0200, Peter Zijlstra wrote: > > On Fri, May 20, 2016 at 05:53:41PM +0530, Shilpasri G Bhat wrote: > > > > > > Below are the comparisons by disabling watchdog. > > > Both schedutil and ondemand have

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-22 Thread Steve Muckle
On Sun, May 22, 2016 at 12:39:12PM +0200, Peter Zijlstra wrote: > On Fri, May 20, 2016 at 05:53:41PM +0530, Shilpasri G Bhat wrote: > > > > Below are the comparisons by disabling watchdog. > > Both schedutil and ondemand have a similar ramp-down trend. And in both the > > cases I can see that freq

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-22 Thread Peter Zijlstra
On Fri, May 20, 2016 at 05:53:41PM +0530, Shilpasri G Bhat wrote: > > Below are the comparisons by disabling watchdog. > Both schedutil and ondemand have a similar ramp-down trend. And in both the > cases I can see that frequency of the cpu is not reduced in deterministic > fashion. In a observati

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-20 Thread Shilpasri G Bhat
Hi, On 05/19/2016 05:10 PM, Peter Zijlstra wrote: > On Wed, May 18, 2016 at 11:11:51PM +0200, Rafael J. Wysocki wrote: >> On Wed, May 18, 2016 at 2:53 PM, Shilpasri G Bhat >> wrote: >>> This patch adds driver callback for fast_switch and below observations >>> on schedutil governor are done with

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-19 Thread Rafael J. Wysocki
On Thu, May 19, 2016 at 1:40 PM, Peter Zijlstra wrote: > On Wed, May 18, 2016 at 11:11:51PM +0200, Rafael J. Wysocki wrote: >> On Wed, May 18, 2016 at 2:53 PM, Shilpasri G Bhat >> wrote: >> > This patch adds driver callback for fast_switch and below observations >> > on schedutil governor are don

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-19 Thread Peter Zijlstra
On Wed, May 18, 2016 at 11:11:51PM +0200, Rafael J. Wysocki wrote: > On Wed, May 18, 2016 at 2:53 PM, Shilpasri G Bhat > wrote: > > This patch adds driver callback for fast_switch and below observations > > on schedutil governor are done with this patch. > > > > In POWER8 there is a regression obs

Re: [RFC PATCH] Increase in idle power with schedutil

2016-05-18 Thread Rafael J. Wysocki
On Wed, May 18, 2016 at 2:53 PM, Shilpasri G Bhat wrote: > This patch adds driver callback for fast_switch and below observations > on schedutil governor are done with this patch. > > In POWER8 there is a regression observed with schedutil compared to > ondemand. With schedutil the frequency is no

[RFC PATCH] Increase in idle power with schedutil

2016-05-18 Thread Shilpasri G Bhat
This patch adds driver callback for fast_switch and below observations on schedutil governor are done with this patch. In POWER8 there is a regression observed with schedutil compared to ondemand. With schedutil the frequency is not ramping down and is mostly stuck at max frequency during idle . T