RE: [Xen-users] HVM Domain poor network performance

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Ralf Schenk
> Sent: 05 October 2006 21:26
> To: Xen Users
> Subject: [Xen-users] HVM Domain poor network performance
> 
> Hello List !
> 
> After my windows 2003 Server setup under XEN 3.0.3-testing (Changeset
> 11636) I was interested in network performance. Windows 2003 
> Server runs
> fine and feels fast but network performance (measured with netio) is
> really bad.
> 
> I only reach about 5-6 MB/s while the I/O load in DOM0 is 
> high, even if
> I measure Dom0 to HVM communication with no physical network involved.

Since the network is "emulated" through QEMU, I'd expect it to be "not so 
great". Exactly how great/poor depends on several factors - which type of 
network device is being emulated being one of the factors. Which network type 
are you using (the driver supports ne2000, realtek 8139 and one more - it used 
to be an AMD Pcnet, but I think it's a Intel something or other now). Try the 
different models - it's not certain that it will actually make much difference, 
but trying will tell you... 

Also make sure that Dom0 is running on a separate CPU (set your CPU-list in the 
config such that Dom0 has one particular CPU-core, and the HVM domain uses a 
different CPU-core - that way, you don't have to wait for the "other CPU to be 
ready" when it's swithcing between Dom0 and DomU). Again, it's hard to say 
exactly how much you get from this, but it should give you some benefit. 
> 
> Is there any way of increasing network performance for HVM guest ?
> 
> I sometimes heard about "paravirtualized drivers"...

This is definitely the way to go, but as far as I'm aware, there's no PV 
drivers for Windows available yet... 

--
Mats
> 
> -- 
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> 
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