linux-kernel - Re: [PATCH 0/6] sched: TTWU, IPI, and assorted stuff

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Message-ID: <20200616163100.GA5370@paulmck-ThinkPad-P72>
Date:   Tue, 16 Jun 2020 09:31:00 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, frederic@...nel.org
Subject: Re: [PATCH 0/6] sched: TTWU, IPI, and assorted stuff

On Mon, Jun 15, 2020 at 12:55:22PM -0700, Paul E. McKenney wrote:
> On Mon, Jun 15, 2020 at 09:11:58PM +0200, Peter Zijlstra wrote:
> > On Mon, Jun 15, 2020 at 10:21:49AM -0700, Paul E. McKenney wrote:
> > > On Mon, Jun 15, 2020 at 06:40:48PM +0200, Peter Zijlstra wrote:
> > 
> > > > Thanks! I've got 16*TREE03 running since this morning, so far so nothing :/
> > > > (FWIW that's 16/9 times overcommit, idle time fluctuates around 10%).
> > > 
> > > My large system as large remote memory latencies, as in the better part
> > > of a microsecond.  My small system is old (Haswell).  So, just to grasp
> > > at the obvious straw, do you have access to a multisocket Haswell system?
> > 
> > I've been running this on a 4 socket haswell ex.
> 
> OK, I officially have no idea, then!

Ah, are you overcommitting?  None of my Haswell runs did any overcommit.

Also, any failures in the meantime?

Any debug/tracing/whatever that I could add to my runs?

							Thanx, Paul