Re: [Xen-devel] pvops domu soft lockup under load (more logs)

[Pim van Riezen <pi@xxxxxxxxxxxxx>]

On Apr 14, 2010, at 19:48 , Jeremy Fitzhardinge wrote:

> On 04/12/2010 02:44 AM, Pim van Riezen wrote:
>> On Apr 10, 2010, at 9:12 , Pim van Riezen wrote:
>> 
>> 
>>>> When you're getting lockups, could you capture the output of sysrq-t (xm
>>>> sysrq <domain> t, or "Ctrl-O t" on the domain's console)?
>>>> 
>>> This one is going to be a bit tough. I only get the error after the fact. 
>>> The domain has multiple vcpu's, so it's usually not apparent that it's 
>>> hanging, all depending on which process gets stuck. I'll keep poking at it 
>>> and if I manage to catch it in the act I'll follow up with a sysrq-t.
>>> 
>> xm sysrq $vps t doesn't seem to add anything to the console. Am I doing it 
>> wrong?
>> 
> 
> Does it appear on the Xen console (visible with "xm dmesg")?  You may
> need to do a sysrq '9' first to get it to output all messages.

I tried:

        xm sysrq $vps 9
        xm sysrq $vps t

nothing shows up on the guest's console, nor in xm dmesg.

Same for doing ^O-9 ^O-t / ^o-9 / ^o-t on the guest's console. 
CONFIG_MAGIC_SYSRQ is enabled in the domU kernel.

Pi


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