From: Florian Weimer <fw@deneb.enyo.de>
To: Da Shi Cao <dscao999@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-x86_64@vger.kernel.org
Subject: Re: [BUG]Uncalibrated TSC is not accurate enough as a time keeper
Date: Thu, 27 Dec 2018 18:35:13 +0100 [thread overview]
Message-ID: <874layvpny.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <CAG3POBnGPabdLQ2wvJc9HTKeHszf+RytV6t+hPyh0k=hjGd+8g@mail.gmail.com> (Da Shi Cao's message of "Sun, 23 Dec 2018 14:56:01 +0800")
* Da Shi Cao:
> The cpu_khz and tsc_khz are now read directly by the cpuid
> instruction, and they are deemed to be very accurate. But this is not
> the case in our situation. The OS time lags behind about 8 seconds per
> hour. The CPU information is as follows:
Is virtualization involved? Do you use a vendor kernel?
Note that <linux-x86_64@vger.kernel.org> is more or less dead, and
your message to linux-kernel might get lost in the flood.
prev parent reply other threads:[~2018-12-27 17:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-23 6:56 [BUG]Uncalibrated TSC is not accurate enough as a time keeper Da Shi Cao
2018-12-27 17:35 ` Florian Weimer [this message]
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=874layvpny.fsf@mid.deneb.enyo.de \
--to=fw@deneb.enyo.de \
--cc=dscao999@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-x86_64@vger.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