netdev - virtio-net zero-copy

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Date:	Mon, 18 May 2009 21:19:47 +0800
From:	Raju Srivastava <raju.s.linux@...il.com>
To:	netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: virtio-net zero-copy

Greetings,

Could someone let me know if current virtio-net supports zero-copy? I
see some discussion here:
http://thread.gmane.org/gmane.comp.emulators.kvm.devel/28061/
(copyless virtio net thoughts) and it looks like the copyless
virtio-net is not supported by KVM yet. If this is true, then is there
any plan to add the zero copy to the virtio-net?

I use KVM in 10G network environment and found the CPU usage is
saturated when network traffic becomes heavy. The native Linux under
the same load only consumes less than 10% CPU.

Thanks in advance,
Raju
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