Re: [Virtio-for-kvm] [PATCH 7/7] userspace virtio

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Dor Laor wrote:
>  From f244bcad756c4f761627557bb7f315b1d8f22fb2 Mon Sep 17 00:00:00 2001
> From: Dor Laor <dor.laor-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
> Date: Thu, 20 Dec 2007 13:26:30 +0200
> Subject: [PATCH] [VIRTIO-NET] Rx performance improvement
>  The current performance are not good enough, the problem lies
>  in qemu tap handling code that caused to pass packets one at
>  a time and also to copy them to a temporal buffer.
>
> This patch prevents qemu handlers from reading the tap and instead
> it selects the tap descriptors for virtio devices.
> This eliminates copies and also batch guest notifications (interrupts).
>
> Using this patch the rx performance reaches 800Mbps.
> The patch does not follow qemu's api since the intention is first to have
> a better io in kvm and then to polish it correctly.
>
>   

This breaks -net user, which is one of the motivations for having a qemu 
net device.  We need to maintain the old path for that, and only use the 
new fast path if using -net tap.


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


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