DragonFly BSD
DragonFly bugs List (threaded) for 2004-07
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Re: text screen saver movement stops

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 9 Jul 2004 10:28:47 -0700 (PDT)

:How about some suggestions to debug the previously
:mentioned problem? and the following?
:I have two identical PR400FX intel MB's connected via ethernet
:one DFly 1.0-RC2 , the other FreeBSD 5.1-p6. 
:I have noticed that the date command on the dfly machine will give
:a different time than the date command on another system (FreeBSD 5.1)
:that is acting as a ntp server for it.
:The time difference has been greater than 6 hours.
:When the dfly system gets some activity on it, and perhaps gets
:the appropriate thread scheduled, the ntpd program will
:slew the clock back to being correct.
:I have ran FreeBSD 4.10 on this hardware, over the weekend,
:and do not believe that there is a hardware problem.

    Hmm.  This is going to be 8254 related.  I don't think we are going 
    to be able to fix it for the first release but we know there are 
    timebase issues.  FreeBSD-5 is probably using a different timer for
    its timebase (look for 'Timecounter' lines in FreeBSD-5's dmesg
    output).  Right now we are only using the 8254 and some motherboards
    have drift issues the the startup calibration does not appear to
    handle well.

					Matthew Dillon 

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