> -----Original Message----- > From: Richard Cochran [mailto:richardcoch...@gmail.com] > Sent: Tuesday, October 14, 2014 9:20 PM > To: Thomas Shao > Cc: t...@linutronix.de; gre...@linuxfoundation.org; linux- > ker...@vger.kernel.org; de...@linuxdriverproject.org; o...@aepfle.de; > a...@canonical.com; jasow...@redhat.com; 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 de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
