linux-3.2.1 + KVM: TSC unstable on Core i5-2400S / H67

[Johannes Stezenbach]

Hi,

I just got the following in dmesg with linux-3.2.1:

[23379.612251] usb 2-1.2: new high-speed USB device number 6 using ehci_hcd
[    0.006666] Marking TSC unstable due to KVM discovered backwards TSC
[23421.511167] Switching to clocksource hpet

The mainboard is an Asus P8H67-V, BIOS 0806 10/26/2011 with Core i5-2400S.
The kvm instance was running for a day already, and there was an overnight
suspend-to-disk cycle in between, but the above happened ~1 hour after resume.
(I don't think the usb message has anything to do with it, it's just
the last message before the TSC message.)

Hm, checking /var/log/kern.* it seems this also happened with
linux-3.1.* without me noticing.

Should I be worried?  I thought Core-i5 processors have a stable TSC?


Johannes
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/