Re: Xen paravirt frontend block hang

[Jeremy Fitzhardinge <jeremy@goop.org>]

Christopher S. Aker wrote:
> Jeremy Fitzhardinge wrote:
>> I've been running this all night without seeing any problem.  I'm 
>> using current x86.git#testing with a few local patches, but nothing 
>> especially relevent-looking.
>
> Meh .. what backend are you using?  We're using LVM volumes exported 
> directly into the domUs like so:
>
> disk =[ 'phy:vg1/xencaker-56392,xvda,w', ... ]
>
>> Could you try the attached patch to see if it makes any difference?
>
> Unfortunately we're still in the same place... pv_ops kernels are 
> still hanging after heavy disk IO:
>
> works - 2.6.18.x (from xen-unstable)
> hangs - 2.6.25-rc3-git3
> hangs - 2.6.25-rc3-git3 + your patch
>
> Any other suggestions or debugging I can provide that would be useful 
> to squash this? 

Are you running an SMP or UP domain?  I found I could get hangs very 
easily with UP (but I need confirm it isn't a result of some other very 
experimental patches).

    J