[Voyage-linux] Clock Drift

[Michael Fung]

You may try to add "clocksource=tsc" to the kernel boot paramters. 
Together with ntpd this workaround worked well for me.

Rgds,
Michael Fung


On 2010-08-27 12:15 AM, Robert wrote:
> Hi Michael,
>
> Thanks for your input. We too have seen some strange issues in the past
> where boxes become unresponsive all of a sudden, there do seem to be
> quite a few issues.
>
> I always seem to feel like I’m trying to hack together patches for very
> simple things which should just work.
>
> I know a few people do have working solution for the clock issues,
> here’s hoping one of them can offer some advice.
>
> Thanks,
>
> Robert
>
>
> On 26/08/2010 17:06, "Michael Cohen" <scudette at gmail.com> wrote:
>
>     2010/8/26 Robert <Robert at supporttime.com>:
>     >  Hello Guys,
>
>     Hi Robert,
>
>     >  I cannot use the ‘nomfgpt’ work around as we rely on the watchdog
>     and doing
>     >  so breaks it.
>
>     We found that sometimes the boards lock up and do not recover even
>     with the watchdog. The problem seems to be that the software watchdog
>     is not activated until the kernel loads the module and runs the
>     service. If the CPU locks up during POST or early boot the box remains
>     US. We are looking at solutions based on a hardware watchdog instead
>     now.
>
>     >  I have installed adjtimex and ntp:
>     >
>     >  apt-get install adjtimex
>     >  apt-get install ntp
>     >
>     >  Which I thought may solve the issue as some others have suggested
>     but even
>     >  with this the clock still drifts wildly, and after just a couple
>     of hours
>     >  the clock is already several minutes out of sync.
>
>     Thats the same behaviour I have found. For some unexplained reason, I
>     found that older voyage linux (0.5) work much better but 0.6 and on do
>     not. We are currently using an old image for this reason.
>
>     >  Can anyone offer any other advice? I could always schedule a cron
>     task to
>     >  correct the clock but that seems so hacky.
>
>     The hardware is hacky too so this is probably the best workaround. The
>     clock quality on the Alixes seems to be very poor.
>
>     Michael
>
>
>
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