From: Thomas Gleixner <tglx@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-kernel@vger.kernel.org,
Daniel Wagner <daniel.wagner@siemens.com>,
Will Deacon <will.deacon@arm.com>,
x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Boqun Feng <boqun.feng@gmail.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [Problem] Cache line starvation
Date: Fri, 21 Sep 2018 14:54:32 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1809211453170.14736@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20180921122058.GB24124@hirez.programming.kicks-ass.net>
On Fri, 21 Sep 2018, Peter Zijlstra wrote:
> On Fri, Sep 21, 2018 at 02:02:26PM +0200, Sebastian Andrzej Siewior wrote:
> > We reproducibly observe cache line starvation on a Core2Duo E6850 (2
> > cores), a i5-6400 SKL (4 cores) and on a NXP LS2044A ARM Cortex-A72 (4
> > cores).
> >
> > The problem can be triggered with a v4.9-RT kernel by starting
>
> > Daniel reported that disabling ticket locks on 4.4 makes the problem go
> > away, but he hasn't run a long time test yet and as we saw with 4.14 it can
> > take quite a while.
>
> On 4.4 and 4.9 ARM64 still uses ticket locks. So I'm very interested to
> know if the ticket locks on x86 really fix or just make it harder.
We can run 4.4. with ticket locks over the weekend.
Thanks,
tglx
next prev parent reply other threads:[~2018-09-21 12:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 12:02 [Problem] Cache line starvation Sebastian Andrzej Siewior
2018-09-21 12:13 ` Thomas Gleixner
2018-09-21 12:50 ` Sebastian Andrzej Siewior
2018-09-21 12:20 ` Peter Zijlstra
2018-09-21 12:54 ` Thomas Gleixner [this message]
2018-10-03 7:51 ` Catalin Marinas
2018-10-03 8:07 ` Thomas Gleixner
2018-10-03 8:28 ` Peter Zijlstra
2018-10-03 10:43 ` Thomas Gleixner
2018-10-03 8:23 ` Peter Zijlstra
2018-09-26 7:34 ` Peter Zijlstra
2018-09-26 8:04 ` Thomas Gleixner
2018-09-26 12:53 ` Will Deacon
2018-09-27 14:25 ` Kurt Kanzenbach
2018-09-27 14:41 ` Kurt Kanzenbach
2018-09-27 14:47 ` Thomas Gleixner
2018-09-28 9:05 ` Kurt Kanzenbach
2018-09-28 15:26 ` Kurt Kanzenbach
2018-09-28 19:26 ` Sebastian Andrzej Siewior
2018-09-28 19:34 ` Thomas Gleixner
2018-10-02 6:31 ` Daniel Wagner
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