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Re: [Xen-devel] HVM dropped packets

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] HVM dropped packets
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Wed, 26 Aug 2009 10:29:50 +0100
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Nathan Stratton <nathan@xxxxxxxxxxxx>
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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

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