Re: 2.6.37 dom0 under Xen 4.1 clocksource not working

[Jeremy Fitzhardinge <jeremy@goop.org>]

On 01/10/2011 07:06 AM, Daniel De Graaf wrote:
> When booting 2.6.37 (from kernel.org) under Xen 4.1, there are
> apparently issues with timer interrupts being delivered to the dom0.
> Repeatedly causing an interrupt (for example, the ACPI power button) will
> allow the system to boot, as does adding "clocksource=jiffies" to the
> kernel command line. This is only present under Xen, not when booting the
> same kernel on real hardware.

Ah, yes.  This is from the cpuidle stuff, I think.  Does booting with
"idle=halt" work?

> When boot with clocksource=jiffies, the system will sometimes freeze
> for about 30 seconds and then continue; however, this could be related
> to kernel debugging that I have enabled.
>
> The only clock-related message in dmesg is:
> [  153.483813] Clocksource tsc unstable (delta = -77312555973 ns)
>
> /sys/devices/system/clocksource/clocksource0/available_clocksource:
>   xen jiffies tsc
>
> I can attach kernel config or other information as required. I have
> observed this on at least two platforms; the 2.6.32.x xen kernels do not
> exhibit this behavior.
>

    J