Re: Clock has stopped (time/date looping over 5 seconds), things

[devzero]

>The looping ~5seconds sounds like nanosecond overflows. Might it be
>that vmware isn't delivering timer interrupts? 

seems so - at least i don`t see LOC (local timer interrupts) increase in /proc/interrupts - the only value increasing there is

1:  <value> IO-APIC-EDGE  i8042

>Could this be an interaction w/ hrt or no_hz?
don`t know - not sure what hrt or no_hz is all about in detail, so please you may tell me what i can check - i will happily deliver all input you need or do any test for you.

btw - since i thought that problem was vmware only, i didn`t put it in bugzilla - but we have at least two reports that similar behaviour has also also been seen on real hardware, so i have created a bugzilla entry at http://bugzilla.kernel.org/show_bug.cgi?id=10446

regards
roland




List:       linux-kernel
Subject:    Re: Clock has stopped (time/date looping over 5 secon
From:       "john stultz" <johnstul () us ! ibm ! com>
Date:       2008-04-16 17:20:25
Message-ID: 1f1b08da0804161020x7335e58qae9a237da83cb93b () mail ! gmail ! com
[Download message RAW]

On Tue, Apr 8, 2008 at 2:47 PM, Roland <devzero@xxxxxx> wrote:
> > It _appears_ that there is a race in the kernel that can be triggered by
> > any number of hardware issues. There's another thread by Gregory Stark
> > with the same symptoms - he thinks his was fixed by replacing a bad
> > DIMM.
> >
>
>  i`d like to mention that we may have a repro-case (if it`s the same issue i
> hit within vmware):
>
>  see http://communities.vmware.com/message/909403

The looping ~5seconds sounds like nanosecond overflows. Might it be
that vmware isn't delivering timer interrupts? Could this be an
interaction w/ hrt or no_hz?

thanks
-john
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