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]
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