linux-kernel - RE: Performance drop on Baytrail with 4.5-rc2

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Date:	Tue, 15 Mar 2016 08:52:34 +0000
From:	"Longepe, Philippe" <philippe.longepe@...el.com>
To:	Thomas Voegtle <tv@...96.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Gasparini, Stephane" <stephane.gasparini@...el.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
Subject: RE: Performance drop on Baytrail with 4.5-rc2

Hi Thomas,

The patches which are improving ffmeg had to be tested for 2 months on android before submission. 

That's why I resubmitted them very recently for review on our internal list.

They will be submitted them to the linux-pm list as soon as our internal review will be finished.

Srinivas, Rafael, did you get a chance to look at my patches (Perf/Power improvements for load-based algorithm) ?

In the meantime I'll do some additional tests with phoronix test suites.

Regards,

Philippe,

________________________________________
From: Thomas Voegtle [tv@...96.de]
Sent: Sunday, March 13, 2016 4:54 PM
To: Longepe, Philippe
Cc: linux-kernel@...r.kernel.org; Gasparini, Stephane; Wysocki, Rafael J
Subject: RE: Performance drop on Baytrail with 4.5-rc2

On Wed, 3 Feb 2016, Longepe, Philippe wrote:

> Hi Thomas,
>
> Thank you for sharing this test. I just did a quick test and yes this is
> really interesting !
>
> Without the scale option, the load is close to 100% for each cpus (so
> the pstates are increasing up to the turbo frequency) but with
> scale=320:208, the load is oscillating (close to 50% in average), so the
> requested frequencies are lower (the power is also reduced).
>
> I have a patch (not yet submitted) that reduce the gap for such a use
> case.

Hi,

may I ask you where this patch stays? I have seen nothing in Linus' tree,
that fixes that performance drop?

Thanks,

   Thomas

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