Hi *, this message appeared in the KVM guest kern.log last night: Mar 27 22:35:30 guest kernel: [260041.559462] Clocksource tsc unstable (delta = -4398046474878 ns) The guest is running a 2.6.31-20-generic-pae ubuntu kernel with hrtimer-tune-hrtimer_interrupt-hang-logic.patch applied. If I understand things correct, in kernel/time/clocksource.c clocksource_watchdog() checks all the /sys/devices/system/clocksource/clocksource0/available_clocksource every 0.5sec for an delta of more than 0.0625s. So the tsc must have changed more than one hour within two subsequent calls of clocksource_watchdog. No event in the host nor anything in the guest gives reasonable cause for this step. However, the number 4398046474878 is only 36226 ns away from 4*1024*1024*1024*1024 The guest is an 32 bit system running in a 64 bit host. Is this an possible cause of this strange message? Any other idea what is going wrong here? Maybe this is a hardware bug? Best regards, Sebastian -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
