Re: [Xen-devel] 2.6.37 dom0 under Xen 4.1 clocksource not working

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

On 01/26/2011 10:40 AM, Jeremy Fitzhardinge wrote:
> 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?
> 

Yes, clocksource=xen idle=halt works.

>> 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.
>>

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