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

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Message-ID: <20200924174506.GE29958@lorien.usersys.redhat.com>
Date:   Thu, 24 Sep 2020 13:45:06 -0400
From:   Phil Auld <pauld@...hat.com>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        "Li, Aubrey" <aubrey.li@...ux.intel.com>,
        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 Thu, Sep 24, 2020 at 10:43:12AM -0700 Tim Chen wrote:
> 
> 
> On 9/24/20 10:13 AM, Phil Auld wrote:
> > On Thu, Sep 24, 2020 at 09:37:33AM -0700 Tim Chen wrote:
> >>
> >>
> >> 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?
> > 
> > In what Romance language does octo mean 10?  :)
> > 
> 
> Got confused by october, the tenth month. :)

It used to be the eigth month ;)

> 
> Tim
> 
> > 
> >> 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
> >>
> > 
> 

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