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Date:   Thu, 24 Sep 2020 13:45:06 -0400
From:   Phil Auld <pauld@redhat.com>
To:     Tim Chen <tim.c.chen@linux.intel.com>
Cc:     Vincent Guittot <vincent.guittot@linaro.org>,
        "Li, Aubrey" <aubrey.li@linux.intel.com>,
        Mel Gorman <mgorman@suse.de>, Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>,
        Valentin Schneider <valentin.schneider@arm.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Qais Yousef <qais.yousef@arm.com>,
        Jiang Biao <benbjiang@gmail.com>
Subject: Re: [RFC PATCH v2] sched/fair: select idle cpu from idle cpumask in
 sched domain
Message-ID: <20200924174506.GE29958@lorien.usersys.redhat.com>
References: <20200916043103.606132-1-aubrey.li@linux.intel.com>
 <20200916110039.GG3117@suse.de>
 <78d608f2-b974-e940-da32-b37777bc405a@linux.intel.com>
 <CAKfTPtAVkg081VEGp3Hx3i7D+jxRJcyBi2=NJypvHH6HVJ8Nwg@mail.gmail.com>
 <CAKfTPtA2yE_sFfP5MFN=K+ph7rqpYUhapUdDBJ5hFLxnQPktJw@mail.gmail.com>
 <af0237e0-1451-9d11-2ee2-1468a8bb6180@linux.intel.com>
 <CAKfTPtD71z-n2dVTpZk5tLwy5OZjkju9v5vJ-3QNHhw8Grhc_Q@mail.gmail.com>
 <40ee756f-1f27-b17e-6292-d8069a56e3c8@linux.intel.com>
 <20200924171339.GD29958@lorien.usersys.redhat.com>
 <129fceda-cf89-de74-f3fd-026c3c089d62@linux.intel.com>
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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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