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From: Tony Lindgren <tony@atomide.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
	Ladislav Michl <ladis@linux-mips.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	"open list:THERMAL" <linux-pm@vger.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
	LAK <linux-arm-kernel@lists.infradead.org>
Subject: Re: Regression in v5.0-rc1 with autosuspend hrtimers
Date: Wed, 9 Jan 2019 08:28:46 -0800	[thread overview]
Message-ID: <20190109162846.GP5544@atomide.com> (raw)
In-Reply-To: <CAJZ5v0hi5sVESKPbZoniikOhNxdUDtJhQrs39Fib8B03MYoMMQ@mail.gmail.com>

* Rafael J. Wysocki <rafael@kernel.org> [190109 09:44]:
> On Wed, Jan 9, 2019 at 2:51 AM Tony Lindgren <tony@atomide.com> wrote:
> >
> > * Vincent Guittot <vincent.guittot@linaro.org> [190109 01:42]:
> > > Le Tuesday 08 Jan 2019 à 13:37:43 (-0800), Tony Lindgren a écrit :
> > > > Lowering the autosuspend_delay_ms to 2100 ms makes things work again.
> > > > Anything higher than 2200 ms seems to somehow time out immediately
> > > > now :)
> > >
> > > This is quite close to the max ns of an int on arm 32bits
> > >
> > > Could you try the patch below ?
> >
> > Yup great thanks, that's it:
> >
> > Tested-by: Tony Lindgren <tony@atomide.com>
> 
> Cool.  Thanks for getting to the bottom of this!

No problem.

One more thing I noticed: The 25% slack can get noticeable
for larger values. For things like a 3 second uart console
timeout slack of 750 ms is quite large variation.

Should we have a limit of max 100 ms for the slack?

Regards,

Tony

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WARNING: multiple messages have this Message-ID (diff)
From: Tony Lindgren <tony@atomide.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	"open list:THERMAL" <linux-pm@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	LAK <linux-arm-kernel@lists.infradead.org>,
	Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
	Ladislav Michl <ladis@linux-mips.org>
Subject: Re: Regression in v5.0-rc1 with autosuspend hrtimers
Date: Wed, 9 Jan 2019 08:28:46 -0800	[thread overview]
Message-ID: <20190109162846.GP5544@atomide.com> (raw)
In-Reply-To: <CAJZ5v0hi5sVESKPbZoniikOhNxdUDtJhQrs39Fib8B03MYoMMQ@mail.gmail.com>

* Rafael J. Wysocki <rafael@kernel.org> [190109 09:44]:
> On Wed, Jan 9, 2019 at 2:51 AM Tony Lindgren <tony@atomide.com> wrote:
> >
> > * Vincent Guittot <vincent.guittot@linaro.org> [190109 01:42]:
> > > Le Tuesday 08 Jan 2019 à 13:37:43 (-0800), Tony Lindgren a écrit :
> > > > Lowering the autosuspend_delay_ms to 2100 ms makes things work again.
> > > > Anything higher than 2200 ms seems to somehow time out immediately
> > > > now :)
> > >
> > > This is quite close to the max ns of an int on arm 32bits
> > >
> > > Could you try the patch below ?
> >
> > Yup great thanks, that's it:
> >
> > Tested-by: Tony Lindgren <tony@atomide.com>
> 
> Cool.  Thanks for getting to the bottom of this!

No problem.

One more thing I noticed: The 25% slack can get noticeable
for larger values. For things like a 3 second uart console
timeout slack of 750 ms is quite large variation.

Should we have a limit of max 100 ms for the slack?

Regards,

Tony

  reply	other threads:[~2019-01-09 16:28 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-07 23:38 Regression in v5.0-rc1 with autosuspend hrtimers Tony Lindgren
2019-01-07 23:38 ` Tony Lindgren
2019-01-08  7:59 ` Vincent Guittot
2019-01-08  7:59   ` Vincent Guittot
2019-01-08 15:53   ` Tony Lindgren
2019-01-08 15:53     ` Tony Lindgren
2019-01-08 16:42     ` Vincent Guittot
2019-01-08 16:42       ` Vincent Guittot
2019-01-08 21:37       ` Tony Lindgren
2019-01-08 21:37         ` Tony Lindgren
2019-01-09  1:42         ` Vincent Guittot
2019-01-09  1:42           ` Vincent Guittot
2019-01-09  1:51           ` Tony Lindgren
2019-01-09  1:51             ` Tony Lindgren
2019-01-09  9:43             ` Rafael J. Wysocki
2019-01-09  9:43               ` Rafael J. Wysocki
2019-01-09 16:28               ` Tony Lindgren [this message]
2019-01-09 16:28                 ` Tony Lindgren
2019-01-09 16:48                 ` Vincent Guittot
2019-01-09 16:48                   ` Vincent Guittot
2019-01-09 16:50                   ` Tony Lindgren
2019-01-09 16:50                     ` Tony Lindgren
2019-01-09 16:55                     ` Vincent Guittot
2019-01-09 16:55                       ` Vincent Guittot
2019-01-09 17:02                       ` Tony Lindgren
2019-01-09 17:02                         ` Tony Lindgren
2019-01-09 11:17           ` Ladislav Michl
2019-01-09 11:17             ` Ladislav Michl
2019-01-09 11:27             ` Vincent Guittot
2019-01-09 11:27               ` Vincent Guittot
     [not found]               ` <20190109115824.GA1353@lenoch>
2019-01-09 13:24                 ` Vincent Guittot
2019-01-09 13:24                   ` Vincent Guittot
     [not found]                   ` <20190109133337.GA13579@lenoch>
2019-01-09 14:12                     ` Vincent Guittot
2019-01-09 14:12                       ` Vincent Guittot
2019-01-09 16:07                       ` Ladislav Michl
2019-01-09 16:07                         ` Ladislav Michl
2019-01-09 16:32                         ` Vincent Guittot
2019-01-09 16:32                           ` Vincent Guittot
2019-01-09 17:26                           ` Ladislav Michl
2019-01-09 17:26                             ` Ladislav Michl
2019-01-09 18:04                             ` Vincent Guittot
2019-01-09 18:04                               ` Vincent Guittot
2019-01-09 22:06                               ` Rafael J. Wysocki
2019-01-09 22:06                                 ` Rafael J. Wysocki
2019-01-10  7:45                                 ` Ladislav Michl
2019-01-10  7:45                                   ` Ladislav Michl
2019-01-10  7:50                                   ` Vincent Guittot
2019-01-10  7:50                                     ` Vincent Guittot
2019-01-10  7:54                                     ` Ladislav Michl
2019-01-10  7:54                                       ` Ladislav Michl

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