Re: [Xen-devel] [PATCH] xen-netfront: report link speed to ethtool

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> The reported NIC speed in the VM does not mean anything really, because
> it's all virtual "hardware", and the reported speed is not any kind of limit.
> 
> Even if windows VM says it's 10 Mbit/sec NIC you can still talk as fast as 
> your
> system can go.
> 

That's not quite true. Windows or some application might equate 10Mbit == WAN 
and do things a bit differently. BITS certainly scales back throughput but I 
think it does that based on actual tested throughput, although it might use the 
link speed as an indication.

A HVM domain needs to report something because it is emulated hardware. A way 
to pass that through from Dom0 would be nice, but probably a lot of work for 
little gain vs just making up a reasonable figure.

James

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