[Rdo-list] Slow network performance on Kilo?

Boris Derzhavets bderzhavets at hotmail.com
Wed Jan 27 21:22:04 UTC 2016

From: rdo-list-bounces at redhat.com <rdo-list-bounces at redhat.com> on behalf of Erich Weiler <weiler at soe.ucsc.edu>
Sent: Wednesday, January 27, 2016 3:30 PM
To: rdo-list at redhat.com
Subject: [Rdo-list] Slow network performance on Kilo?

Hi Y'all,

I've seen several folks on the net with this problem, but I'm still
flailing a bit as to what is really going on.

We are running RHEL 7 with RDO OpenStack Kilo.

We are setting this environment up still, not quite done yet.  But in
our testing, we are experiencing very slow network performance when
downloading or uploading to and from VMs.  We get like 300Kb/s or so.

We are using Neutron, MTU 9000 everywhere.  I've tried disabling GSO,
LRO, TSO, GRO on the neutron interfaces, as well as the VM server
interfaces, still no improvement.  I've tried lowing the VM MTU to 1500,
still no improvement.   It's really strange.  We do get connectivity, I
can ssh to the instances, but the network performance is just really,
really slow.  It appears the instances can talk to each other very
quickly however.  They just get slow network to the internet (i.e. when
packets go through the network node).

We are using VLAN tenant network isolation.

   1. Switch to VXLAN tunneling
   2. Activate DVR . It's already  stable on RDO Kilo.
       It  will result  routing of  North-South && East-West traffic avoiding
       Network Node.


Can anyone point me in the right direction?  I've been beating my head
against a wall and googling without avail for a week...

Many thanks,

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