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RE: [Xen-devel] RE: [PATCH] record max stime skew (was RE: [PATCH] stric

To: "dan.magenheimer@xxxxxxxxxx" <dan.magenheimer@xxxxxxxxxx>, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] RE: [PATCH] record max stime skew (was RE: [PATCH] strictly increasing hvm guest time)
From: "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>
Date: Thu, 3 Jul 2008 10:35:48 -0600
Cc: Dave Winchell <dwinchell@xxxxxxxxxxxxxxx>
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> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx]On Behalf Of Dan
> Magenheimer
> Subject: [Xen-devel] RE: [PATCH] record max stime skew (was 
> 
> > Perhaps this relatively large skew happens at start of day, 
> before the
> > periodic calibration has 'locked on'?
> 
> Indeed you are correct.  This updated patch now reports zero skew
> as expected.
> 
> IMHO, it would be nice to put this patch into the tree as it
> will be good for helping to diagnose time skew problems
> such as the one just reported on the list.

Oops!  Just after I sent the above email, I checked again and
the same machine (no reboots, no guests ever launched) now reports
a max stime skew of 4333ns!!  Methinks there might be some
periodic glitch in the calibration code?

Dan


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