From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Sebastian Siewior <bigeasy@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [patch 0/4] timer/nohz: Fix timer/nohz woes
Date: Sat, 6 Jan 2018 15:21:44 -0800 [thread overview]
Message-ID: <20180106232144.GB9671@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1801062215570.2376@nanos>
On Sat, Jan 06, 2018 at 10:18:40PM +0100, Thomas Gleixner wrote:
> On Fri, 5 Jan 2018, Paul E. McKenney wrote:
> > But after more than 1,000 hours of test runs, split roughly evenly
> > among the above three scenarios, there is no statistically significant
> > difference in error rate among them. This means that there is some
> > other bug lurking somewhere, and having the same appearance (lost timer).
> > Were you guys ever able to reproduce this via rcutorture?
>
> No.
I was afraid of that... ;-)
> We'll setup more testing on Monday. Which of the tests fails or at least
> exposes the highest failure rate?
TREE01, as in:
bash tools/testing/selftests/rcutorture/bin/kvm.sh --cpus 48 --duration 180 --configs "42*TREE01"
This results in 42 runs of TREE01 consuming about 21 hours of wall-clock
time. (Each run of TREE01 uses 8 CPUs.)
Thanx, Paul
next prev parent reply other threads:[~2018-01-06 23:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-22 14:51 Thomas Gleixner
2017-12-22 14:51 ` [patch 1/4] timer: Use deferrable base independent of base::nohz_active Thomas Gleixner
2017-12-25 16:24 ` Frederic Weisbecker
2017-12-29 22:45 ` [tip:timers/urgent] timers: " tip-bot for Anna-Maria Gleixner
2017-12-22 14:51 ` [patch 2/4] nohz: Prevent erroneous tick stop invocations Thomas Gleixner
2017-12-26 15:17 ` Frederic Weisbecker
2017-12-27 18:22 ` Thomas Gleixner
2017-12-27 18:24 ` Thomas Gleixner
2017-12-27 20:58 ` Thomas Gleixner
2017-12-29 16:12 ` Frederic Weisbecker
2017-12-29 22:46 ` [tip:timers/urgent] nohz: Prevent a timer interrupt storm in tick_nohz_stop_sched_tick() tip-bot for Thomas Gleixner
2017-12-22 14:51 ` [patch 3/4] timer: Invoke timer_start_debug() where it makes sense Thomas Gleixner
2017-12-29 22:47 ` [tip:timers/urgent] timers: " tip-bot for Thomas Gleixner
2017-12-22 14:51 ` [patch 4/4] timerqueue: Document return values of timerqueue_add/del() Thomas Gleixner
2017-12-29 22:47 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2017-12-22 17:09 ` [patch 0/4] timer/nohz: Fix timer/nohz woes Paul E. McKenney
2017-12-24 1:21 ` Paul E. McKenney
2017-12-24 1:29 ` Paul E. McKenney
2018-01-05 19:41 ` Paul E. McKenney
2018-01-06 21:18 ` Thomas Gleixner
2018-01-06 23:21 ` Paul E. McKenney [this message]
2017-12-27 20:55 ` Thomas Gleixner
2017-12-29 22:46 ` [tip:timers/urgent] timers: Reinitialize per cpu bases on hotplug tip-bot for Thomas Gleixner
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