From mboxrd@z Thu Jan  1 00:00:00 1970
From: david ahern <daahern@cisco.com>
Subject: Re: still seeing network freezes with rtl8139 nic
Date: Mon, 25 Feb 2008 21:57:00 -0700
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Cc: kvm-devel <kvm-devel@lists.sourceforge.net>
To: Avi Kivity <avi@qumranet.com>
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Almost 7 hours and the uniprocessor case is still chugging along.

david


Avi Kivity wrote:
> 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.
> 

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