Open Stack

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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