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


  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Tue, 18 Nov 2008 23:02:54 +1100
  • Delivery-date: Tue, 18 Nov 2008 04:03:25 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AclJdZaq6OGodxhGRNi3MA0h9mpWyQ==
  • Thread-topic: theoretical network rx performance of Windows with PV drivers

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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