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

["George Dunlap" <George.Dunlap@xxxxxxxxxxxxx>]

A couple of questions:
* You're comparing dom0->domU performance; what about domU to off-box?
 i.e., if it goes overr th enetwork card?
* Have you compared the same test with a PV domU?

  -George

On Tue, Nov 18, 2008 at 12:50 PM, James Harper
<james.harper@xxxxxxxxxxxxxxxx> wrote:
>> On 18/11/08 12:02, "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
> wrote:
>>
>> > 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?
>>
>> I don't think evtchn->IRQ latency is particularly large. But also I
> don't
>> know what else might be causing your erratic behaviour.
>>
>
> That's probably all I needed to know for now. I think it might actually
> be Windows that's the problem...
>
> Thanks
>
> James
>
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