Re: [Xen-users] Re: [Xen-devel] Release 0.8.5 of GPL PV drivers

To:	"James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-users] Re: [Xen-devel] Release 0.8.5 of GPL PV drivers forWindows
From:	"Emre ERENOGLU" <erenoglu@xxxxxxxxx>
Date:	Tue, 18 Mar 2008 13:43:38 +0100
Cc:	Scott McKenzie <scott.xensource@xxxxxxxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
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Hi James,

> Any idea yet about the culprit for the network performance issues?
>

Yes. Windows isn't flexible enough to like what Linux is giving it :)

I think high CPU when testing network between DomU and Dom0 is a bit of a red herring. There is no external NIC involved, performance is all about how fast the CPU can move the bits, so all things being equal, CPU utilization should be high.

When testing between DomU and an external host the CPU utilization should be more respectable though...

James

Isn't these 100 mbps or 1000 mbps speeds funny numbers for today's CPU power? I mean, somewhere in the design, there's something wrong that forces us to make possibly too many context switches between DomU, Hypervisor and Dom0. ???

Emre

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Re: [Xen-users] Re: [Xen-devel] Release 0.8.5 of GPL PV drivers forWindo