On Tue, Sep 14, 2010 at 12:36:23PM -0700, Shirley Ma wrote:

On Tue, 2010-09-14 at 21:01 +0200, Michael S. Tsirkin wrote:

quoted

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I think that you should be able to simply combine
the two drivers together, add an ioctl to
enable/disable zero copy mode of operation. 

That could work. But what's the purpose to have two drivers if one
driver can handle it?

Thanks
Shirley

This was just an idea: I thought it's a good way for people interested
in this zero copy thing to combine forces and avoid making
the same mistakes, but it's not a must of course. 

Ok, I will make a simple patch by reusing Xiaohui's some vhost code on
handling vhost_add_used_and_signal() to see any performance changes.

The interesting thing here when I run 32 instances netperf/netserver I
didn't see any issue w/i this patch.

Thanks
Shirley

Yes, I agree this patch is useful for demo purposes:
simple, and shows what kind of performance gains
we can expect for TX.

-- 
MST