Re: still seeing network freezes with rtl8139 nic

Avi Kivity
2008-02-25T17:19:57Z

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