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From: Ingo Molnar <mingo@kernel.org>
To: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Andy Lutomirski <luto@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Abysmal scheduler performance in Linus' tree?
Date: Thu, 7 Sep 2017 09:31:37 +0200
Message-ID: <20170907073137.yyht5pqbpshpyiwl@gmail.com> (raw)
In-Reply-To: <1504764929.6355.5.camel@gmx.de>


* Mike Galbraith <efault@gmx.de> wrote:

> On Wed, 2017-09-06 at 18:14 +0200, Peter Zijlstra wrote:
> > On Wed, Sep 06, 2017 at 11:03:33AM +0200, Peter Zijlstra wrote:
> > > On Wed, Sep 06, 2017 at 01:59:14AM -0700, Andy Lutomirski wrote:
> > > > > Any specifics on your setup?
> > > > 
> > > > On further fiddling, I only see this after a suspend and resume cycle.
> > > 
> > > Ah, ok. That's not something I otherwise test. Lets see if I can force
> > > this brick of mine through a suspend-resume cycle :-)
> > 
> > I'd be suspicious of these here commits:
> > 
> >   77d1dfda0e79 ("sched/topology, cpuset: Avoid spurious/wrong domain rebuilds")
> 
> Seems to be that one.  After suspend/resume, cpu7 (i4790+SMT) is online
> with NULL domain.  offline/online it, it grows proper domains.

Thanks, that's really useful, should narrow things down!

> (on vacation, about to go explore that unfamiliar 'outside' place)  

Be careful, it's a dangerous world for kernel hackers! ;-)

Thanks,

	Ingo

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-06  5:13 Andy Lutomirski
2017-09-06  8:25 ` Peter Zijlstra
2017-09-06  8:59   ` Andy Lutomirski
2017-09-06  9:03     ` Peter Zijlstra
2017-09-06 16:14       ` Peter Zijlstra
2017-09-07  6:15         ` Mike Galbraith
2017-09-07  7:31           ` Ingo Molnar [this message]
2017-09-07  9:13           ` [PATCH] sched/cpuset/pm: Fix cpuset vs suspend-resume Peter Zijlstra
2017-09-07  9:26             ` Peter Zijlstra
2017-09-07 10:54               ` Rafael J. Wysocki
2017-09-07 20:38               ` Tejun Heo
2017-09-07 10:33             ` [tip:sched/urgent] sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs tip-bot for Peter Zijlstra
2017-09-06  9:15 ` Abysmal scheduler performance in Linus' tree? Chris Wilson
2017-09-06  9:24   ` Peter Zijlstra
     [not found]     ` <150469312649.28581.17626550155735691534@mail.alporthouse.com>
2017-09-06 10:44       ` Peter Zijlstra
2017-09-06 10:51         ` Peter Zijlstra
2017-09-07  8:16           ` [tip:sched/urgent] sched/fair: Fix wake_affine_llc() balancing rules tip-bot for Peter Zijlstra

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