Re: [9fans] odd clock behaviour

[David Presotto <presotto@closedmind.org>]

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Timesync could be pushing your time up faster than it should.  Are you
running it?

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From: Sam <sah@softcardsystems.com>
To: <9fans@cse.psu.edu>
Subject: Re: [9fans] odd clock behaviour
Date: Thu, 13 Mar 2003 11:22:57 -0500 (EST)
Message-ID: <Pine.LNX.4.30.0303131122030.10504-100000@athena>

I've noticed a clock drift on my 600E.

On Thu, 13 Mar 2003
rog@vitanuova.com wrote:

> has anyone else experienced odd clock behaviour on their plan 9
> system?
>
> i'm running on an IBM Thinkpad (T22), and occasionally (not always) i
> get the clock running much faster than it should (#r/rtc still gives
> the correct time)
>
> as an example (i ran this a few minutes ago):
> % echo `{cat '#r/rtc'; cat /dev/time; }; sleep 100; echo `{cat '#r/rtc'; cat /dev/time; }
> 1047563747 1047629025 1047629025597639124 41354973397504 305454592
> 1047563792 1047629508 1047629508199623282 41502386389760 305454592
> % % echo `{cat '#r/rtc'; cat /dev/time; }; sleep 100; echo `{cat '#r/rtc'; cat /dev/time; }
> 1047563991 1047632392 1047632392826308124 42383508857344 305454592
> 1047564039 1047632728 1047632728118785531 42485925484288 305454592
> % % % echo `{cat '#r/rtc'; cat /dev/time; }; sleep 100; echo `{cat '#r/rtc'; cat /dev/time; }
> 1047564093 1047633210 1047633210610709377 42633304858112 305454592
> 1047564136 1047633742 1047633742398391924 42795741847808 305454592
> %
>
> i.e.  /dev/time advanced by 483, 336 and 532 seconds respectively,
> while #r/rtc advanced by 45, 48 and 43 seconds respectively,
> all for a nominally 100 second sleep!
>
> the power has been plugged in continuously (i.e.  it shouldn't have
> invoked any funny power-saving clock changing).
>
> this leads to some odd effects on the user interface, not to mention
> the fact that date(1) now thinks it's 11:18am tomorrow...
>
>   cheers,
>     rog.
>