[TriLUG] XEN bridging with SLES 11

[David Brain]

Yes, I was wondering about hvm vs paravirt too.  I've not had the 10G
hardware, but I did see this with 1Gbps Xen Dom0 and Windows HVM
guests, where they only saw their NICs as 100Mbps due to the drivers,
I did not see this on the Linux PV guests.  I never felt the need to
try the paravirt windows drivers (especially in production...) but
presumably that would have resolved the issue.

Note also that snmp (on the guest) can get 'confused' about the data
rate of the interface (paravirt) and report it incorrectly, it may
need to be forced in snmpd.conf.

David.

On Thu, Jun 30, 2011 at 8:59 AM, Jack Hill <jackhill at jackhill.us> wrote:
> On Wed, 2011-06-29 at 09:14 -0400, Stephen Boyte wrote:
>> I wondered if anyone could shed some light on a simple way to pipe in a 10GB
>> or even 1GB connection to guest servers on a XEN install of SLES 11.
>> Currently, I only see the default drivers and choices for the connections.
>> I have a 10GB connection to DOM 0 but only seem to get 100Mbs connection
>> through the old Realtek driver.  Any ideas would be greatly appreciated.  If
>> it makes any difference my onboard nics use an Emulex driver.
>>
>> Regards,
>> Stephen
>
> To be clear SLES is the dom0 or domU? What is the other one?
>
> My first thought would be to try running it under paravirtualization
> instead of hardware-supported virtualization. The paravirt hardware is
> more performant than the emulated hardware. As an added bonus you might
> bet better disk performance as well.
>
> One or two years ago I had problems where paravm domU nics came up with
> tcp segmentation offload on (or after migrating between hosts). This
> drastically cut down on performance, but everything was speedy once I
> turned it off. I believe that this has been fixed, but if you're having
> problems with your paravm I would look at the output of ethtool -k.
>
> Hope that helps,
> Jack
>
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