2015-01-22 16:12-0200, Marcelo Tosatti: > On Thu, Jan 22, 2015 at 02:59:28PM +0100, Radim Krčmář wrote: > > I don't understand what the guest wants to achieve with the delta. > > Neither do I. It seems to assume that TSC delta is unreliable, while > system_timestamp is reliable. > > Therefore if TSC delta is large, request a system_timestamp update, > which keeps TSC delta small. I was wondering how they do that ... kvm clock has like 1 MSR interface; multiple registrations are supposed to work? > > I thought that checking this only made sense if the guest didn't believe > > that PV clock works with large delta. And they only want precision. > > (What else is there on a clock?) > > Ok right they assumed TSC was not reliable? Most likely. (And that doing complicated magic is going to help it -- doesn't VMENTRY do pretty much everyting that can be done with unreliable TSC?) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
