Actually, I didn't test against OpenBsd.
Without this patch, ne2K driver in Linux will complain about "bogus 
packet size" under high load(copy a large file larger than 100M among 
Domain). At the same time, the driver may also drop a large number of 
error packets. It also improve the performance 2 or 3 times in my test. 
The original result is about 700 KB/s. After patching it, the result is 
about 1.8M~2M /s.
What's more important is it could prevent the emulated net card from 
being halted caused by IRQ missing problem. After the device-model 
transfering to event driven model, ne2000 card cannot work stable in 
VMX. Hope this patch could solve this problem!

_______________________________________________________
Best Regards,
hanzhu


Ian Pratt дµÀ:
>>> This small could make ne2000 net card on HVM work stable.
>>> I have submitted the patch to qemu mail list. Actually, they only 
>>> check the second part of it!
>> Does this actually fix any reported bugs or measurably 
>> improve performance? If not then it isn't worth us diverging 
>> from qemu code: 
>> it's up to qemu maintainers whether or not to accept the patch.
> 
> Does it solve the issue that OpenBSD had with the ne2k emulation under
> high load?
> 
> Ian
> 
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