From: John Stultz <john.stultz@linaro.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Feng Tang <feng.tang@intel.com>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
"H. Peter Anvin" <hpa@linux.intel.com>,
x86@kernel.org, Len Brown <lenb@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/5] Add support for S3 non-stop TSC support.
Date: Mon, 01 Apr 2013 13:41:30 -0700 [thread overview]
Message-ID: <5159F0FA.40306@linaro.org> (raw)
In-Reply-To: <20130401203136.GA2543@amd.pavel.ucw.cz>
On 04/01/2013 01:31 PM, Pavel Machek wrote:
>
> Certainly for short sleeps. Is TSC actually precise enough to keep
> precise time for hours? I thought TSC sucked at precision.
Well, we can measure suspend using the ntp corrected frequency, so that
should be ok, assuming the freq doesn't change during suspend.
But yes, the long term accuracy will depend on the actual hardware
implementation, so we'll have to see what the hardware does.
Even so, other boards have similar non-stop clocksources in suspend that
could be used in a similar fashion, so I think this is still the right
appraoch.
thanks
-john
next prev parent reply other threads:[~2013-04-01 20:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-21 6:38 [RFC PATCH 0/5] Add support for S3 non-stop TSC support Feng Tang
2013-01-21 6:38 ` [RFC PATCH 1/5] x86: Add cpu capability flag X86_FEATURE_TSC_S3_NOTSTOP Feng Tang
2013-01-21 7:27 ` Chen Gong
2013-01-21 7:59 ` Feng Tang
2013-01-21 15:58 ` H. Peter Anvin
2013-01-22 14:07 ` Feng Tang
2013-01-21 6:38 ` [RFC PATCH 2/5] clocksource: Add new feature flag CLOCK_SOURCE_SUSPEND_NOTSTOP Feng Tang
2013-01-21 6:38 ` [RFC PATCH 3/5] x86: tsc: Add support for new S3_NOTSTOP feature Feng Tang
2013-01-21 6:38 ` [RFC PATCH 4/5] clocksource: Enlarge the maxim time interval when configuring the scale and shift Feng Tang
2013-01-21 7:25 ` Chen Gong
2013-01-21 6:38 ` [RFC PATCH 5/5] timekeeping: Add support for clocksource which doesn't stop during suspend Feng Tang
2013-01-21 13:55 ` [RFC PATCH 0/5] Add support for S3 non-stop TSC support Rafael J. Wysocki
2013-03-30 18:14 ` Pavel Machek
2013-04-01 17:32 ` John Stultz
2013-04-01 20:31 ` Pavel Machek
2013-04-01 20:41 ` John Stultz [this message]
2013-01-21 18:46 ` John Stultz
2013-01-22 14:55 ` Feng Tang
2013-01-22 21:56 ` John Stultz
2013-01-24 3:37 ` Feng Tang
2013-01-24 18:15 ` Jason Gunthorpe
2013-01-22 19:57 ` Jason Gunthorpe
2013-01-22 20:22 ` John Stultz
2013-01-23 0:26 ` Jason Gunthorpe
2013-01-23 0:41 ` John Stultz
2013-01-23 1:37 ` Jason Gunthorpe
2013-01-23 1:54 ` John Stultz
2013-01-23 2:35 ` Jason Gunthorpe
2013-01-23 3:07 ` John Stultz
2013-01-23 19:23 ` Jason Gunthorpe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5159F0FA.40306@linaro.org \
--to=john.stultz@linaro.org \
--cc=feng.tang@intel.com \
--cc=hpa@linux.intel.com \
--cc=lenb@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=pavel@ucw.cz \
--cc=rafael.j.wysocki@intel.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox