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> >
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