[Rdo-list] Slow network performance on Kilo?

[Attila Fazekas]

My first wild guess,
it is something not OK around VLAN splinters.

It can be both config or driver related issue.

Just for the record, can you share these info
- kernel version
- ovs version (build)
- nic (lspci -nn | grep Eth)

Do you use some kind of bonding ?


----- Original Message -----
> From: "Boris Derzhavets" <bderzhavets at hotmail.com>
> To: "Erich Weiler" <weiler at soe.ucsc.edu>, rdo-list at redhat.com
> Sent: Wednesday, January 27, 2016 10:22:04 PM
> Subject: Re: [Rdo-list] Slow network performance on Kilo?
> 
> 
> 
> ________________________________________
> 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.
> 
>   Boris.
> 
> 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,
> erich
> 
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