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Re: [Xen-users] Release 0.8.9 of GPL PV drivers for Windows

To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Release 0.8.9 of GPL PV drivers for Windows
From: "Emre ERENOGLU" <erenoglu@xxxxxxxxx>
Date: Sat, 26 Apr 2008 13:31:53 +0300
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Hi James, great news. As I'm in vacation, I won't be able to test it but hope it works well.

Did you consider sending an email to the kernel dev guys to inform them about this issue? maybe it's by design, maybe there's something that can be improved.


On Sat, Apr 26, 2008 at 9:49 AM, James Harper <james.harper@xxxxxxxxxxxxxxxx> wrote:
Here's the latest version. Took me ages to get to the bottom of what
turned out to be a pretty simple problem - windows can give us more
pages in a packet than Linux can handle but Linux (netback) doesn't
complain about it, it just creates corrupt packets :(

Download from http://www.meadowcourt.org/WindowsXenPV-0.8.9.zip

I'll probably do another release very shortly, mainly to reduce memory
consumption on the tx side so that more interfaces can run at once.

>From the testing I've done, on a UP windows DomU, with iperf options '-l
1M -w 1M', with the iperf server running in Dom0, I get TX throughput of
about 1.5Gbits/second and RX throughput of about 0.5Gbits/second. When I
tried it under SMP it worked, but the performance was horrible. Probably
best if you don't run it under SMP for the moment :)

I did have a test performance of 2.5Gbits/second, but now that I have to
copy the windows buffers into my own buffers to reduce page usage, I
seem to only be able to get about 1.5Gbits/second out of it... This kind
of makes sense given that DomU to Dom0 network performance is going to
be CPU and Memory bandwidth bound.


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Emre Erenoglu
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