From: Miroslav Lichvar <mlichvar@redhat.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
John Stultz <john.stultz@linaro.org>,
Prarit Bhargava <prarit@redhat.com>
Subject: Re: [PATCH] rtc: adapt allowed RTC update error
Date: Tue, 1 Dec 2020 18:14:20 +0100 [thread overview]
Message-ID: <20201201171420.GN1900232@localhost> (raw)
In-Reply-To: <20201201161224.GF5487@ziepe.ca>
On Tue, Dec 01, 2020 at 12:12:24PM -0400, Jason Gunthorpe wrote:
> On Tue, Dec 01, 2020 at 03:38:35PM +0100, Miroslav Lichvar wrote:
> > + unsigned long time_set_nsec_fuzz;
> > + static unsigned int attempt;
>
> Adding a static value instide a static inline should not be done
Well, grepping through the other header files in include/linux, this
would not be the first case.
> I'm not sure using a static like this is the best idea anyhow, if you
> want something like this it should be per-rtc, not global
If there are multiple RTCs, are they all updated in this 11-minute
sync?
> Did you look at why time has become so in-accurate in your system? 5
> jiffies is usually a pretty long time?
I found no good explanation. It seems to depend on what system is
doing, if it's idle, etc. I suspect it's a property of the workqueues
that they cannot generally guarantee the jobs to run exactly on time.
I tried switching to the non-power-efficient and high priority
workqueues and it didn't seem to make a big difference.
--
Miroslav Lichvar
next prev parent reply other threads:[~2020-12-01 17:15 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 14:38 [PATCH] rtc: adapt allowed RTC update error Miroslav Lichvar
2020-12-01 16:12 ` Jason Gunthorpe
2020-12-01 17:14 ` Miroslav Lichvar [this message]
2020-12-01 17:35 ` Jason Gunthorpe
2020-12-02 10:01 ` [PATCHv2] " Miroslav Lichvar
2020-12-02 13:44 ` [PATCH] " Thomas Gleixner
2020-12-02 15:07 ` Miroslav Lichvar
2020-12-02 15:36 ` Miroslav Lichvar
2020-12-02 18:36 ` Thomas Gleixner
2020-12-02 16:27 ` Jason Gunthorpe
2020-12-02 19:21 ` Thomas Gleixner
2020-12-02 20:54 ` Jason Gunthorpe
2020-12-02 22:08 ` Thomas Gleixner
2020-12-02 23:03 ` Jason Gunthorpe
2020-12-03 1:14 ` Thomas Gleixner
2020-12-03 2:04 ` Jason Gunthorpe
2020-12-03 2:10 ` Alexandre Belloni
2020-12-03 15:39 ` Thomas Gleixner
2020-12-03 16:16 ` Jason Gunthorpe
2020-12-03 21:05 ` Thomas Gleixner
2020-12-03 21:31 ` Thomas Gleixner
2020-12-03 22:36 ` Jason Gunthorpe
2020-12-04 13:02 ` Thomas Gleixner
2020-12-04 14:08 ` Jason Gunthorpe
2020-12-04 14:37 ` Alexandre Belloni
2020-12-04 14:46 ` Jason Gunthorpe
2020-12-04 15:08 ` Alexandre Belloni
2020-12-04 15:57 ` Jason Gunthorpe
2020-12-04 16:35 ` Alexandre Belloni
2020-12-03 22:00 ` Alexandre Belloni
2020-12-04 9:34 ` Thomas Gleixner
2020-12-04 9:51 ` Alexandre Belloni
2020-12-04 10:44 ` Thomas Gleixner
2020-12-03 17:29 ` Alexandre Belloni
2020-12-03 19:52 ` Thomas Gleixner
2020-12-03 15:52 ` Jason Gunthorpe
2020-12-03 16:07 ` Alexandre Belloni
2020-12-03 20:10 ` Jason Gunthorpe
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