Am Thu, 13 Dec 2018 07:46:36 -0700
schrieb "Jan Beulich" :
> >>> On 13.12.18 at 14:25, wrote:
> > The question is, how much drift can be tolerated even without my patch.
> This depends on what a system is used for. A few seconds off may
> be fine for one purpose, but a significant problem for
>>> On 13.12.18 at 14:25, wrote:
> The question is, how much drift can be tolerated even without my patch.
This depends on what a system is used for. A few seconds off may
be fine for one purpose, but a significant problem for another.
Similarly a sudden (however small) change to the TSC tick rat
Am Thu, 13 Dec 2018 03:41:44 -0700
schrieb "Jan Beulich" :
> And further argumentation that everyone is using NTP anyway
> doesn't make it any better, when it's no-where written down that
> Xen is unusable with NTP running in all guests (I'm exaggerating
> here just to get the point over). Don't f
Am Thu, 13 Dec 2018 03:41:44 -0700
schrieb "Jan Beulich" :
> In a second step, let's consider what impact errors in calibration have.
> Between two systems with exactly the same hardware crystal
> frequency there of course is going to be some drift. The problem
> though is - between the two calibr
>>> On 13.12.18 at 10:04, wrote:
> Am Thu, 13 Dec 2018 01:45:39 -0700
> schrieb "Jan Beulich" :
>
>> >>> On 13.12.18 at 09:18, wrote:
>> > Am Wed, 12 Dec 2018 09:39:25 -0700
>> > schrieb "Jan Beulich" :
>> >
>> >> >>> On 12.12.18 at 16:20, wrote:
>> >> > If a domU uses TSC as clocksour
Am Thu, 13 Dec 2018 01:45:39 -0700
schrieb "Jan Beulich" :
> >>> On 13.12.18 at 09:18, wrote:
> > Am Wed, 12 Dec 2018 09:39:25 -0700
> > schrieb "Jan Beulich" :
> >
> >> >>> On 12.12.18 at 16:20, wrote:
> >> > If a domU uses TSC as clocksoure it also must run NTP in some way to
> >> > a
>>> On 13.12.18 at 09:18, wrote:
> Am Wed, 12 Dec 2018 09:39:25 -0700
> schrieb "Jan Beulich" :
>
>> >>> On 12.12.18 at 16:20, wrote:
>> > If a domU uses TSC as clocksoure it also must run NTP in some way to
>> > avoid the potential drift what will most likely happen, independent of
>> > any m
Am Wed, 12 Dec 2018 09:39:25 -0700
schrieb "Jan Beulich" :
> >>> On 12.12.18 at 16:20, wrote:
> > If a domU uses TSC as clocksoure it also must run NTP in some way to
> > avoid the potential drift what will most likely happen, independent of
> > any migration.
> Which drift? While anyone's we
>>> On 12.12.18 at 16:20, wrote:
> Improve decision when vTSC emulation will be activated for a domU with
> tsc_mode=default. The current approach is to compare the cpu_khz value
> from two physical hosts. Since this value is not accurate, it can not be
> used verbatim to decide if vTSC emulation
Improve decision when vTSC emulation will be activated for a domU with
tsc_mode=default. The current approach is to compare the cpu_khz value
from two physical hosts. Since this value is not accurate, it can not be
used verbatim to decide if vTSC emulation needs to be enabled. Without
this change e
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