From: Dave Winchell <dwinchell@virtualiron.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: Dave Winchell <dwinchell@virtualiron.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Ian Pratt <Ian.Pratt@eu.citrix.com>,
"dan.magenheimer@oracle.com" <dan.magenheimer@oracle.com>
Subject: Re: Re: Fix for get_s_time()
Date: Thu, 24 Apr 2008 14:32:39 -0400 [thread overview]
Message-ID: <4810D247.7040400@virtualiron.com> (raw)
In-Reply-To: <C43675C0.1FEDC%keir.fraser@eu.citrix.com>
Keir Fraser wrote:
>On 24/4/08 17:04, "Dave Winchell" <dwinchell@virtualiron.com> wrote:
>
>
>
>>yes, this is the issue. What you suggest should be fine and I am trying
>>it now.
>>With the locking version (and a fix to a bug I introduced) I got .0012%
>>error
>>on an overnight run with hpet layered on get_s_time_mono(), which is the
>>max(prev, cur) layer on get_s_time we discussed.
>>
>>
>
>12 parts per million is pretty good. Is that cumulative deviation from 'wall
>time' over ~12 hours?
>
yes, deviation between the guest's time and an ntp reference.
> That could easily be explained by the fact that Xen
>system time is not sync'ed with ntp.
>
>
That's true. And, as we have discussed, this error seems to vary quite a bit
platform to platform for some reason. I will verify that this still is
the case.
-Dave
> -- Keir
>
>
>
>
next prev parent reply other threads:[~2008-04-24 18:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <47FFC37A.4060402@virtualiron.com>
2008-04-11 21:20 ` System time monotonicity Keir Fraser
2008-04-11 21:41 ` Keir Fraser
2008-04-11 22:58 ` Dave Winchell
2008-04-12 7:09 ` Keir Fraser
2008-04-21 19:26 ` Dan Magenheimer
2008-04-21 19:31 ` Keir Fraser
2008-04-21 20:32 ` Fix for get_s_time() Dave Winchell
2008-04-21 22:55 ` Keir Fraser
2008-04-21 23:10 ` Keir Fraser
2008-04-22 14:09 ` Dave Winchell
2008-04-24 16:04 ` Dave Winchell
2008-04-24 16:37 ` Keir Fraser
2008-04-24 18:32 ` Dave Winchell [this message]
2008-04-25 19:48 ` Dave Winchell
2008-04-25 21:03 ` Dan Magenheimer
2008-04-26 1:54 ` Dave Winchell
2008-04-28 17:39 ` Dan Magenheimer
2008-04-28 18:09 ` Dave Winchell
2008-04-28 18:40 ` Dave Winchell
2008-04-29 7:14 ` Keir Fraser
2008-04-29 14:21 ` Dave Winchell
2008-04-28 20:11 ` Dan Magenheimer
2008-04-28 21:29 ` Dave Winchell
2008-04-11 22:22 ` System time monotonicity Dan Magenheimer
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