> -----Original Message----- > From: Richard Cochran [mailto:richardcochran@xxxxxxxxx] > Sent: Tuesday, October 14, 2014 9:20 PM > To: Thomas Shao > Cc: tglx@xxxxxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; > apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx; KY Srinivasan > Subject: Re: [PATCH 2/2] hyperv: Implement Time Synchronization using host > time sample > > On Tue, Oct 14, 2014 at 01:04:35PM +0000, Thomas Shao wrote: > > > > + /* > > > > + * Use the Hyper-V time sample to adjust the guest time. The > > > > + * algorithm is: If the sample offsets exceeds 1 second, we > > > > + * directly set the clock to the server time. If the offset is > > > > > > So the guests will experience random time jumps in the kernel, > > > without any rhyme or reason? > > > > This behavior is designed for some extreme cases. Like manually > > setting guest time to some value. Or the host resumes from a hibernate > > state. Normally, we should not run into this. > > But when it *does* happen, the guest software will have no way of knowing > what happened. That stinks. > > Taking your example, when the guest sets its time, the time will suddenly > jump somewhere else, and for no apparent reason. > > From the guest's point of view, this is really not acceptable. > If the user chooses to sync guest time with host, that's the expected behavior, right? > Thanks, > Richard _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
