Try this Cisco white paper. *10Ge Connectivity with Windows Servers* http://www.cisco.com/c/dam/en/us/products/collateral/switches/nexus-7000-series-switches/C07-572828-00_10Gb_Conn_Win_DG.pdf
See page 14. *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 11:09 AM, JR <[email protected]> wrote: > Darn. That dropped the performance by ~50% ... > > > On 5/9/2014 1:57 PM, Adam Lawson wrote: > > I just heard back. Within Windows, disable Large File Offload. > > > > Let me know how that goes? > > > > 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 10:54 AM, JR <[email protected]> wrote: > > > >> 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 <[email protected]> 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 <[email protected]> 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 > >>>>>> > >>>>>> > >>>>>> > >>>>>> _______________________________________________ > >>>>>> Mailing list: > >>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > >>>>>> Post to : [email protected] > >>>>>> Unsubscribe : > >>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > >>>>>> > >>>>> > >>>> > >>>> -- > >>>> Your electronic communications are being monitored; strong encryption > is > >>>> an answer. My public key > >>>> <http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4F08C504BD634953 > > > >>>> > >>> > >> > >> -- > >> Your electronic communications are being monitored; strong encryption is > >> an answer. My public key > >> <http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4F08C504BD634953> > >> > > > > -- > Your electronic communications are being monitored; strong encryption is > an answer. My public key > <http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4F08C504BD634953> >
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