[Xen-devel] theoretical network rx performance of Windows with PV drivers

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

I'm finding some odd things during development of the GPLPV and am
wondering if I'm just expecting too much of a HVM Windows DomU.

I'm using iperf for testing, and the most I can get on a 1.8GHz AMD1210
out of a Dom0->DomU network performance is about 500MBits, and that's
with Dom0 sending packets at close to 1GBit, with about 50% of packets
being lost. But it's not consistent... things seem to stall at strange
times (some of that may be a driver or a windows problem - the time
between scheduling a Dpc and the Dpc being executed is up to 3 seconds
sometimes when this happens...)

How much overhead is introduced in the event channel -> HVM IRQ path, as
compared to the normal interdomain event channels? I think that the
delay there might be bringing me down, but maybe I'm looking in the
wrong place?

Thanks

James

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