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

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Message-ID: <20200615191158.GK2531@hirez.programming.kicks-ass.net>
Date:   Mon, 15 Jun 2020 21:11:58 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.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 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.