Hi, thanks for your reply:
Am Dienstag 09 Oktober 2007 01:55:16 schrieb Dong, Eddie: > 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 have just installed KVM 46 into my Ubuntu 7.04 kernel (2.6.22 based) and it seems to work with the old KVM 22 user space. Strangely I still get no "kvm" binary installed to my --prefix/bin, only qemu stuff, so I tried to run it from the directory, but grub won't boot for some reason. That 0.1% kills me though. do you mean, that every 1 second, 1 will be 1ms off? And for every second thereafter, leaving me with 1 second drift after only 1000 seconds? With the KVM 22 userspace and KVM 46 kernelspace I am 20 seconds off, after uptime of 33 minutes. That uptime is wrong by 20 seconds I take, but it's around 0.1% (relatively exactly even), so it's not what you consider a bug? I am looking for an absolute value for time difference between guest and host that is supposed to be small over longer periods. Is that not achievable for a paravirtual guest?! I really need gettimeofday() calls to be near exactly the same value for applications in guest and host even after months. To give a bit background: We are maintainers of an air traffic management system that receives UTC dated input from the outside, and makes estimates about flight positions based on that information. In order to make correct estimates about current position, the current time and the observation time must be compared, and errors in the current time easily will lead to an error in the range of miles. Best regards, Kay Hayen ------------------------------------------------------------------------- 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
