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Re: [Xen-users] Debian + XEN 3.2. + Windows VM || ping problems
| To: | Sebastian Plagemann <sebastian.plagemann@xxxxxx>, xen-users List <xen-users@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-users] Debian + XEN 3.2. + Windows VM || ping problems |
| From: | Andrew Lyon <andrew.lyon@xxxxxxxxx> |
| Date: | Tue, 7 Apr 2009 15:37:36 +0100 |
| Cc: | |
| Delivery-date: | Tue, 07 Apr 2009 07:38:22 -0700 |
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On Tue, Apr 7, 2009 at 3:28 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote: > On Tue, Apr 7, 2009 at 2:37 PM, Sebastian Plagemann > <sebastian.plagemann@xxxxxx> wrote: >> Hi, >> just one question: what does this timer_mode do? >> >> Thanks >> Sebastian > > Details of the bug you hit can be found at > http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=895 , but I've > never found a description of what the difference is between the > available timer modes, I just use mode 1 for windows hvm's. > > Andy > I just found this explanation: Timer_mode 0/1 track exact number of timer interrupt which need be injected to guest. If timer interrupts cannot be injected on time, pending_count++. The difference is that for mode 0, guest TSC is also hold back if there are timer interrupts pending, while for mode 1 guest TSC always equals to (host TSC - constant offset) Time mode 2/3 don't inject each pending time interrupt to guest, hoping guest OS itself can handle time interrupt lost and adjust time using platform timer (e.g. HPET)'s counter. Andy _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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