Date: Sun, 2 Jan 2011 12:20:12 GMT From: Greg Holmberg <fbsd-9.0-aws-ec2-1293964000@holmberg.to> To: freebsd-xen@FreeBSD.org Subject: Re: kern/153620: Xen guest system clock drifts in AWS EC2 (FreeBSD 9.0-CURRENT i386 T1-micro) Message-ID: <201101021220.p02CKCg1041380@freefall.freebsd.org>
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The following reply was made to PR kern/153620; it has been noted by GNATS.
From: Greg Holmberg <fbsd-9.0-aws-ec2-1293964000@holmberg.to>
To: bug-followup@FreeBSD.org
Cc:
Subject: Re: kern/153620: Xen guest system clock drifts in AWS EC2 (FreeBSD
9.0-CURRENT i386 T1-micro)
Date: Sun, 2 Jan 2011 12:51:33 +0100
On Sun, Jan 02, 2011 at 03:16:52AM -0800, Colin Percival wrote:
>
> Can you tell me:
> 1. Did the clock run ahead, or behind?
The NTP adjustment is a positive number (see below). Does this mean the
clock is running slow?
> 2. Can you reproduce this?
>
Yes. In the existing AMI, I just reset the clock again. Since I filed
the PR, it had drifted "offset 0.124360 sec". While writing this email,
it has drifted another "offset 0.009534 sec". I will let it go without
correction for a while now.
> 3. Did the clock _drift_, or _jump_?
>
Good question. Based on a handful of invocations of ntpdate, I would
say that it drifts. The offset is different each time. ...
Regards,
Greg
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