Re: [Xen-devel] HVM dropped packets

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 26 Aug 2009, Keir Fraser wrote:
> On 26/08/2009 08:45, "Nathan Stratton" <nathan@xxxxxxxxxxxx> wrote:
> 
> >> I bet the drops are caused by the low performance of Qemu nic _emulation_.
> > 
> > Does one emulate better then the rest?
> 
> e1000 is probably faster than the rest due to a more efficient hardware
> interface better suited to emulation. You may still get receiver overruns
> though (which I think was the source of the drops you were seeing?). That's
> simply the host receiving packets faster than they can get stuffed through
> the emulated interface.

ON this note KVM people stated that the emulated e1000 gives 90% of virtio
performances.


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