netdev - Re: virtio-net zero-copy

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Message-ID: <4A1169EE.3050603@redhat.com>
Date:	Mon, 18 May 2009 17:00:14 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Raju Srivastava <raju.s.linux@...il.com>
CC:	netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: virtio-net zero-copy

Raju Srivastava wrote:
> 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. 

That is correct.

> If this is true, then is there
> any plan to add the zero copy to the virtio-net?
>   

Yes, but it will be a difficult journey.

> 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.
>   

Running the latest guest and host software (both qemu and kernel) will 
improve things somewhat.


-- 
error compiling committee.c: too many arguments to function

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