[Rdo-list] Slow network performance on Kilo?

[Chris Clark (chrclark)]

You might also test by lowering the VM MTU to 1400 to avoid possible fragmentation issues somewhere? Just as a test to see what happens.

-----Original Message-----
From: rdo-list-bounces at redhat.com [mailto:rdo-list-bounces at redhat.com] On Behalf Of Attila Fazekas
Sent: Thursday, January 28, 2016 8:51 AM
To: Boris Derzhavets <bderzhavets at hotmail.com>
Cc: rdo-list at redhat.com
Subject: Re: [Rdo-list] Slow network performance on Kilo?

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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