Re: VirtIO vs Emulation Netperf benchmark results

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On Wed, Oct 10, 2012 at 3:04 PM, Alexander Graf <agraf@xxxxxxx> wrote:
>
>
> On 10.10.2012, at 21:02, Peter Maydell <peter.maydell@xxxxxxxxxx> wrote:
>
>> On 10 October 2012 19:50, Alexander Graf <agraf@xxxxxxx> wrote:
>>> Network emulation in QEMU is more than just slow (expected).
>>>
>>>
>>> Why is this expected? This performance drop is quite terrifying.
>>
>> Well, it's pretty poor (and suggests the exit path could
>> be optimised) but the reason that it is insanely slow rather
>> than merely not good is that the lan9118 requires a device
>> register read or write for every word of data transferred to
>> the network...
>
> Ouch. Any way we could fake a PCI controller and emulate some real hardware?
>
if we're doing anything else than the real hardware why not just use
virtio then?

-Christoffer
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