linux-kernel - Re: [RFC PATCH v2] sched/fair: select idle cpu from idle cpumask in sched domain

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Message-ID: <40ee756f-1f27-b17e-6292-d8069a56e3c8@linux.intel.com>
Date:   Thu, 24 Sep 2020 09:37:33 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>,
        "Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:     Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Valentin Schneider <valentin.schneider@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Qais Yousef <qais.yousef@....com>,
        Jiang Biao <benbjiang@...il.com>
Subject: Re: [RFC PATCH v2] sched/fair: select idle cpu from idle cpumask in
 sched domain



On 9/22/20 12:14 AM, Vincent Guittot wrote:

>>
>>>>
>>>> And a quick test with hackbench on my octo cores arm64 gives for 12

Vincent,

Is it octo (=10) or octa (=8) cores on a single socket for your system?
The L2 is per core or there are multiple L2s shared among groups of cores?

Wonder if placing the threads within a L2 or not within
an L2 could cause differences seen with Aubrey's test.

Tim