Re: [kvm-devel] still seeing network freezes with rtl8139 nic

[Avi K. <av...@qu...>]

david ahern wrote:
> david ahern wrote:
>   
>> Avi Kivity wrote:
>>     
>>> - the in-kernel ioapic is buggy and needs the extra kicking the
>>> optimization prevents.  Can be checked by re-adding the optimization to
>>> kvm_ioapic_set_irq() (keeping it removed in qemu).  If it works, the
>>> problem is in userspace.  If it fails, the problem is in the kernel.
>>>
>>> Something like
>>>
>>>  static int old_level[16];
>>>
>>>  if (level == old_level[irq])
>>>     return;
>>>  old_level[irq] = level;
>>>
>>>       
>
> With the "if (!change) return;" taken out of pci_set_irq() and the above code
> added to kvm_ioapic_set_irq() networking froze.
>   

That points the finger at the kernel ioapic.

I saw from the /proc/interrupts dump that it's an smp guest.  Does it 
freeze on uniprocessor as well?  Maybe it's bad locking in the kernel.

-- 
error compiling committee.c: too many arguments to function