[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Guest time and TSCs since changeset 17716
On 29/12/2008 17:23, "Frank Van Der Linden" <Frank.Vanderlinden@xxxxxxx> wrote: > Changeset 17716 provides monotonically increasing guest time for HVM > domains, by using the per-domain pl_time structure. hvm_get_guest_time > and hvm_set_guest_time were changed to use this. Previously, the guest > time was stored directly in the TSC offset fields of the vmx/smv control > structures. > > Since pt_freeze_time and pt_thaw_time use hvm_get/set_guest_time, they > now no longer freeze TSC time for a guest. So, for timer_mode 0, TSC > time is no longer frozen when a VCPU is not running. Unless you're using > opt_softtsc, in which TSC exactly tracks the per-domain values. > > I have no love for timer_mode 0 (it has serious issues on SMP), but was > this change intentional? Or am I perhaps missing something? It sounds unintentional, but as you say no one really uses timer_mode 0 so I suppose it's gone unnoticed so far. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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