Re: [Xen-users] XCP Linux Para virtualization 10 GigE interfaces

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, May 06, 2011 at 03:11:35PM -0400, Hoot Thompson wrote:
> Dustin,
> 
> I'm back. In the interim I've secured two loaner NICs from Intel that
> support SR-IOV. Problem I'm now having is that my VM dies right after the
> interfaces are brought up when I enable the technology. My VM is CentOS 5.5.
> Have you or do you know someone that has gotten SR-IOV working on an XCP
> base and if so, what was used for the guest OS?
> 

You should update to CentOS 5.6. It has fixes for VF drivers in the kernel.

-- Pasi

> Thanks!
> 
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Dustin Marquess
> Sent: Tuesday, April 19, 2011 12:33 PM
> To: Hoot Thompson
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] XCP Linux Para virtualization 10 GigE interfaces
> 
> First step is to run the script under "Disable CheckSum Offload" @
> http://www.xenappblog.com/2010/citrix-xenserver-slow-network-performance/
> 
> Second step is to tweak your TCP stack for 10 GigE.  Something like:
> http://staff.psc.edu/benninge/networking/10GbE/parameters.html
> 
> This will help.  But to get near native speeds you're going to have to
> go SR-IOV.  That's really the only way to get high speed networking in
> a VM setup.
> 
> -Dustin
> 
> On Tue, Apr 19, 2011 at 7:04 AM, Hoot Thompson <hoot@xxxxxxxxxx> wrote:
> > My test system consists of two XCP 1.0 nodes plus an Ubuntu frontend
> running
> > OpenXenManager. The two XCP 1.0 nodes have both GigE and 10 GigE
> interfaces
> > but of interest is the 10 GigE.  My goal is to get wire speed on the 10
> GigE
> > from guests running on each of the nodes. So far I have built CentOS 5.6
> > guests on both the nodes and I have brought up the 10 GigE interface
> between
> > the two. Performance is around 20% of wire. My assumption is that I need
> to
> > run para virtualized drivers. So that's my question, how do I set it up?
> So
> > far on each of the CentOS guests I've installed kmod-xenpv (yum install
> > kmod-xenpv*). Good so far? What next?
> >
> > Thanks in advance!
> >
> >
> >
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> >
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