linux-kernel - Re: [Problem] Cache line starvation

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Message-ID: <20180921125047.s5tnsji2esn6gkas@linutronix.de>
Date:   Fri, 21 Sep 2018 14:50:48 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Daniel Wagner <daniel.wagner@...mens.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will.deacon@....com>, x86@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [Problem] Cache line starvation

On 2018-09-21 14:13:19 [+0200], Thomas Gleixner wrote:
> On Fri, 21 Sep 2018, 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).
> 
> We tried to reproduce on AMD, but so far no failure.

After tweaking the config a little, it just triggered after ~8 minutes
on a A10-7800.

> Thanks,
> 
> 	tglx

Sebastian