linux-kernel - Re: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle candidate and the basis for SIS

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Message-ID: <20180201091137.GX2269@hirez.programming.kicks-ass.net>
Date:   Thu, 1 Feb 2018 10:11:37 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Galbraith <efault@....de>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle
 candidate and the basis for SIS

On Wed, Jan 31, 2018 at 09:44:18AM -0800, Srinivas Pandruvada wrote:

> Much more throttling required compared to PERF_CTL. MSR_HWP_REQUEST is
> much slower compared to PERF_CTL (as high as 10:1). 

Still much better than what other architectures have to deal with ;-)