linux-kernel - Re: Time keeping while suspended in the presence of persistent clock drift

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87wnkbuuuz.ffs@tglx>
Date:   Sat, 11 Dec 2021 14:36:04 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Joel Daniels <jdaniels@...t.com>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Time keeping while suspended in the presence of persistent
 clock drift

Joel!

On Thu, Dec 09 2021 at 11:06, Joel Daniels wrote:
> I have an x86 laptop whose CMOS (RTC) clock gains an extra 3.75 seconds
> per day that it is suspended (S3) or off. It keeps time quite accurately
> while awake using the TSC clock source. I use the machine about 1 hour
> per day with the machine in the S3 sleep state for the remaining 23
> hours.
>
> The machine is not usually connected to a network and I do not run an
> NTP daemon (though I do not believe this is relevant). When cold

Believe does not help much for analyzing technical problems. :)

Can you please verify that the problem persists with NTP enabled and
synchronized?

Thanks,

        tglx