Kay Hayen wrote: > Hello Dong and others, > > thanks for the replies. I was trying to get KVM up with latest > kernel, but didn't immediately succeed. I have it built with the > instructions from a previous reply and it seemed OK, but I haven't > had a chance to try it out yet. > > As for testing the time shift: To us the virtual machine would be > like another hardware baseline to verify. So we will have to do that > to test the time correctness. What to do? > > Sending time stamped broadcast or multicast messages may well do the > trick, I have yet to look on how the network stack or the guest and > host work together in paravirtualization with KVM. > > Also I would not be sure what a 0.1% shift would be. From what do you > mean the percentage? Or is that a typo and you would mean 0.1 ms ? > > Best regards, > Kay Hayen > >>> So in FAQ and Wiki I didn't find how to make the guest use host >>> time. Is that possible at all? For VMWare it is said that clock=pit >>> would help, but that seemed to be no change. >>> >>> Can you please point me to what to do? >>> >>> Best regards, >>> Kay Hayen >> >> If you can get latest KVM up + clock=pit, I bet you will get a much >> much accurate guest time. If you still see > 0.1% shift, please file >> a bug. thx,eddie
I mean wall clock shift will be <0.1%. For network packet, it is different with that in native since a VCPU may be descheduled. But it is same even in native when you compare a fast box vs. slow box. thx,eddie ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
