linux-kernel - Re: Fwd: Intel hybrid CPU scheduler always prefers E cores

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Message-ID: <c2a9ceb3d7b1f384ad94d10b7058bb1cebea3d07.camel@linux.intel.com>
Date:   Tue, 28 Nov 2023 15:10:48 -0800
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Ramses <ramses@...l-founded.dev>
Cc:     Bagas Sanjaya <bagasdotme@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux Power Management <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Yu Chen <yu.c.chen@...el.com>,
        srinivas.pandruvada@...ux.intel.com
Subject: Re: Fwd: Intel hybrid CPU scheduler always prefers E cores

On Tue, 2023-11-28 at 23:33 +0100, Ramses wrote:

> I applied the patch on top of 6.6.2, but unfortunately I see more or less the same behaviour as before, with single-threaded CPU-bound tasks running almost exclusively on E cores.
>
> Ramses

I suspect that you may have other issues. I wonder if CPU priorities are getting
assigned properly on your system.

Saw in the original bugzilla 
https://bugzilla.kernel.org/show_bug.cgi?id=218195
that you don't see /proc/sys/kernel/sched_itmt_enabled which
may be a symptom of such a problem.

+Srinivas, is there something Ramses can do to help
find out if there are issues with cppc?

Tim