Open Stack

Adam,

If I'm looking in the right place (the redhat virtio ethernet adapter
properties), there is nowhere to specify forcing the speed or duplex.
The only value I see is Init.ConnectionRate (which is 10G). I've been
able to see performance in excess of 2Gb/sec (when running an iperf
against the ubuntu host on which the VM runs) so it doesn't think it's a
1G NIC; the performance is just very poor. The same iperf from a centos
VM to its host gives > 9Gb/sec.

Thanks
JR

On 5/9/2014 1:19 PM, Adam Lawson wrote:
> Is the duplex setting and speed set on each side to force 10ge (since
> auto-neg seems to not work in this scenario)? Still waiting to hear back on
> steps taken in the situation I described earlier.
> 
> Mahalo,
> Adam
> 
> 
> *Adam Lawson*
> AQORN, Inc.
> 427 North Tatnall Street
> Ste. 58461
> Wilmington, Delaware 19801-2230
> Toll-free: (844) 4-AQORN-NOW
> Direct: +1 (302) 268-6914
> 
> 
> 
> On Fri, May 9, 2014 at 9:25 AM, JR <botemout at gmail.com> wrote:
> 
>> I'd be very appreciative to hear how you solved this Adam.  ;-)
>>
>> On 5/9/2014 12:29 AM, Adam Lawson wrote:
>>> Look at the TCP stack within Windows and optimizations recommended by
>>> Microsoft. I don't think it's a KVM or openstack question to be honest.
>> We
>>> ran into similar issues on plain old Win2008 R2 servers that were running
>>> on bare metal. Will update again when I ping someone to find out what
>>> specifically it was back then.
>>>
>>>
>>> *Adam Lawson*
>>> AQORN, Inc.
>>> 427 North Tatnall Street
>>> Ste. 58461
>>> Wilmington, Delaware 19801-2230
>>> Toll-free: (844) 4-AQORN-NOW
>>> Direct: +1 (302) 268-6914
>>>
>>>
>>>
>>> On Thu, May 8, 2014 at 6:59 PM, JR <botemout at gmail.com> wrote:
>>>
>>>> Greetings,
>>>>
>>>> My openstack grizzly cluster runs on ubuntu 12.04 servers with 10G NICs.
>>>> I have ubuntu, centos and windows 2008 R2 guests.  I've noticed that
>>>> while both my linux guests can communicate at some reasonable
>>>> approximation of 10G wire speed (e.g., 7-9Gb/sec on iperf tests), the
>>>> windows guests max out at 2.5G when talking to the host on which they
>>>> run, down to ~1.2G to other hosts.
>>>>
>>>> I've made some modifications as per this doc:
>>>>
>>>> http://www.linux-kvm.org/page/WindowsGuestDrivers/kvmnet/registry
>>>>
>>>> and upgraded my virtio network driver, but it's not helped.  I've also
>>>> done about an hour or two of googling which has revealed little.
>>>>
>>>> I understand that this is not an openstack issue, but, I suspect, others
>>>> have encountered this when bringing 2008 R2 guests into their clusters.
>>>> Anyone?
>>>>
>>>> Thanks much,
>>>> JR
>>>>
>>>>
>>>>
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>>>
>>
>> --
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> 

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