From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>,
Nicholas Piggin <npiggin@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: sched_rt_period_timer causing large latencies
Date: Thu, 05 Apr 2018 10:40:20 +0200 [thread overview]
Message-ID: <1522917620.5593.5.camel@gmx.de> (raw)
In-Reply-To: <20180405082701.GL4082@hirez.programming.kicks-ass.net>
On Thu, 2018-04-05 at 10:27 +0200, Peter Zijlstra wrote:
> On Thu, Apr 05, 2018 at 09:11:38AM +1000, Nicholas Piggin wrote:
> > Hi,
> >
> > I'm seeing some pretty big latencies on a ~idle system when a CPU wakes
> > out of a nohz idle. Looks like it's due to the taking a lot of remote
> > locks and cache lines. irqoff trace:
>
> On RT I think we default RT_RUNTIME_SHARE to false, maybe we should do
> the same for mainline.
Probably. My very first enterprise encounter with the thing was it NOT
saving a box from it's not so clever driver due to that.
-Mike
next prev parent reply other threads:[~2018-04-05 8:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-04 23:11 sched_rt_period_timer causing large latencies Nicholas Piggin
2018-04-05 6:46 ` Mike Galbraith
2018-04-05 7:44 ` Nicholas Piggin
2018-04-05 8:11 ` Mike Galbraith
2018-04-05 8:27 ` Peter Zijlstra
2018-04-05 8:40 ` Mike Galbraith [this message]
2018-04-05 10:08 ` Nicholas Piggin
2018-04-05 10:44 ` Nicholas Piggin
2018-04-06 16:23 ` Peter Zijlstra
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