Hi Dan, > On Wed, Feb 13, 2008 at 10:41:44AM +0100, Koen Vermeer wrote: >> I'm running an Linux AMD64 guest on an AMD64 host. The host is running a >> 2.6.23 kernel (self compiled), the guest is running a stock >> linux-image-2.6.22-3-amd64 Debian kernel. >> My problem is that the clock on the guest is off (slow), while the clock >> on the host seems to be OK. When doing 'time sleep 10' on the guest, it >> takes about 16 'real' seconds for it to finish. > What is the clock source of your guest? If it is the traditional PIT, > you describe a known problem in busy hosts. You may try to set > clocksource=tsc in the guest kerenl parameters.
Thanks for your reply. I tried looking for PIT in dmesg, which didn't give me anything. Then I tried 'dmesg|grep -i tsc' and I got Time: tsc clocksource has been installed. I then ran 'dmesg|grep -i clock' and got ACPI: PM-Timer IO Port: 0xb008 time.c: Detected 1803.751 MHz processor. Calibrating delay using timer specific routine.. 14442.19 BogoMIPS (lpj=28884398) Using local APIC timer interrupts. Detected 62.628 MHz APIC timer. * Found PM-Timer Bug on the chipset. Due to workarounds for a bug, Time: tsc clocksource has been installed. Real Time Clock Driver v1.12ac PCI: Setting latency timer of device 0000:00:01.1 to 64 PCI: Setting latency timer of device 0000:00:01.2 to 64 The kernel command line is rather simple: root=/dev/hda1 ro quiet Does that answer your question, or should I be looking somewhere else? Thanks! Koen ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
