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Hello,

In dnsmasq file in neutron will be ok. It will then force option 26 on vm.
You can also manually change it on vms to tests.

Slawek Kaplonski

W dniu 22.01.2015 o 17:06, Pedro Sousa pisze:
> Hi Slawek,
>
> I'll test this, did you change the mtu on dnsmasq file in /etc/neutron/?
> Or do you need to change on other places too?
>
> Thanks,
> Pedro Sousa
>
> On Wed, Jan 21, 2015 at 4:26 PM, Sławek Kapłoński <slawek at kaplonski.pl
> <mailto:slawek at kaplonski.pl>> wrote:
>
>     I have similar and I also got something like 2-2,5Gbps between vms.
>     When I
>     change it to 8950 on vms (so in neutron conf) (50 less then on
>     hosts) then it
>     is much better.
>     You can check that probably when You make test between vms on host
>     there is
>     process called "vhost-net" (or something like that) and it uses 100%
>     of one cpu
>     core and that is imho bottleneck
>
>     Slawek Kaplonski
>
>     On Wed, Jan 21, 2015 at 04:12:02PM +0000, Pedro Sousa wrote:
>      > Hi Slawek,
>      >
>      > I have dhcp-option-force=26,1400 in neutron-dnsmasq.conf and
>     MTU=9000 on
>      > network-interfaces in the operating system.
>      >
>      > Do I need to change somewhere else?
>      >
>      > Thanks,
>      > Pedro Sousa
>      >
>      > On Wed, Jan 21, 2015 at 4:07 PM, Sławek Kapłoński
>     <slawek at kaplonski.pl <mailto:slawek at kaplonski.pl>>
>      > wrote:
>      >
>      > > Hello,
>      > >
>      > > Try to set bigger jumbo framse on hosts and vms. For example on
>     hosts You
>      > > can
>      > > set 9000 and then 8950 and check then. It helps me with similar
>     problem.
>      > >
>      > > Slawek Kaplonski
>      > >
>      > > On Wed, Jan 21, 2015 at 03:22:50PM +0000, Pedro Sousa wrote:
>      > > > Hi all,
>      > > >
>      > > > is there a way to improve network performance on my instances
>     with
>      > > VXLAN? I
>      > > > changed the MTU on physical interfaces to 1600, still
>     performance it's
>      > > > lower than in baremetal hosts:
>      > > >
>      > > > *On Instance:*
>      > > >
>      > > > [root at vms6-149a71e8-1f2a-4d6e-bba4-e70dfa42b289 ~]# iperf3 -s
>      > > > -----------------------------------------------------------
>      > > > Server listening on 5201
>      > > > -----------------------------------------------------------
>      > > > Accepted connection from 10.0.66.35, port 42900
>      > > > [  5] local 10.0.66.38 port 5201 connected to 10.0.66.35 port
>     42901
>      > > > [ ID] Interval           Transfer     Bandwidth
>      > > > [  5]   0.00-1.00   sec   189 MBytes  1.59 Gbits/sec
>      > > > [  5]   1.00-2.00   sec   245 MBytes  2.06 Gbits/sec
>      > > > [  5]   2.00-3.00   sec   213 MBytes  1.78 Gbits/sec
>      > > > [  5]   3.00-4.00   sec   227 MBytes  1.91 Gbits/sec
>      > > > [  5]   4.00-5.00   sec   235 MBytes  1.97 Gbits/sec
>      > > > [  5]   5.00-6.00   sec   235 MBytes  1.97 Gbits/sec
>      > > > [  5]   6.00-7.00   sec   234 MBytes  1.96 Gbits/sec
>      > > > [  5]   7.00-8.00   sec   235 MBytes  1.97 Gbits/sec
>      > > > [  5]   8.00-9.00   sec   244 MBytes  2.05 Gbits/sec
>      > > > [  5]   9.00-10.00  sec   234 MBytes  1.97 Gbits/sec
>      > > > [  5]  10.00-10.04  sec  9.30 MBytes  1.97 Gbits/sec
>      > > > - - - - - - - - - - - - - - - - - - - - - - - - -
>      > > > [ ID] Interval           Transfer     Bandwidth       Retr
>      > > > [  5]   0.00-10.04  sec  2.25 GBytes  1.92 Gbits/sec   43
>      > >  sender
>      > > > [  5]   0.00-10.04  sec  2.25 GBytes  1.92 Gbits/sec
>      > > >  receiver
>      > > >
>      > > >
>      > > > *On baremetal:*
>      > > > iperf3 -s
>      > > > warning: this system does not seem to support IPv6 - trying IPv4
>      > > > -----------------------------------------------------------
>      > > > Server listening on 5201
>      > > > -----------------------------------------------------------
>      > > > Accepted connection from 172.16.21.4, port 51408
>      > > > [  5] local 172.16.21.5 port 5201 connected to 172.16.21.4
>     port 51409
>      > > > [ ID] Interval           Transfer     Bandwidth
>      > > > [  5]   0.00-1.00   sec  1.02 GBytes  8.76 Gbits/sec
>      > > > [  5]   1.00-2.00   sec  1.07 GBytes  9.23 Gbits/sec
>      > > > [  5]   2.00-3.00   sec  1.08 GBytes  9.29 Gbits/sec
>      > > > [  5]   3.00-4.00   sec  1.08 GBytes  9.27 Gbits/sec
>      > > > [  5]   4.00-5.00   sec  1.08 GBytes  9.27 Gbits/sec
>      > > > [  5]   5.00-6.00   sec  1.08 GBytes  9.28 Gbits/sec
>      > > > [  5]   6.00-7.00   sec  1.08 GBytes  9.28 Gbits/sec
>      > > > [  5]   7.00-8.00   sec  1.08 GBytes  9.29 Gbits/sec
>      > > > [  5]   8.00-9.00   sec  1.08 GBytes  9.28 Gbits/sec
>      > > > [  5]   9.00-10.00  sec  1.08 GBytes  9.29 Gbits/sec
>      > > > [  5]  10.00-10.04  sec  42.8 MBytes  9.31 Gbits/sec
>      > > > - - - - - - - - - - - - - - - - - - - - - - - - -
>      > > > [ ID] Interval           Transfer     Bandwidth       Retr
>      > > > [  5]   0.00-10.04  sec  10.8 GBytes  9.23 Gbits/sec   95
>      > >  sender
>      > > > [  5]   0.00-10.04  sec  10.8 GBytes  9.22 Gbits/sec
>      > > >  receiver
>      > > >
>      > > >
>      > > > Thanks,
>      > > > Pedro Sousa
>      > >
>      > > > _______________________________________________
>      > > > OpenStack-operators mailing list
>      > > > OpenStack-operators at lists.openstack.org
>     <mailto:OpenStack-operators at lists.openstack.org>
>      > > >
>     http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>      > >
>      > >
>
>

-- 
Pozdrawiam
Sławek Kapłonski
slawek at kaplonski.pl