On 12/16/2014 09:38 AM, Adrián Norte Fernández wrote:
Disable offloading on the nodes with: ethtool -K interfaceName gro off
gso off tso off
And then try it again
That should only make things better if there was some sort of actual
functional problem no?
When diagnosing "network" performance issues I like to get other things
out of the way - so get rid of filesystems, encryption, etc. To that
end I would suggest running a basic network benchmark. I have a natural
bias towards netperf of course :) http://www.netperf.org/ but even
iperf would suffice.
I've also found (based on some ancient work back in the whatever the "D"
release was called time frame that emulated NICs (in my case the
realtek) are much slower than the virt_io "NIC." In the case of the
realteck emulation at least, my recollection was the maximum I got out
of an instance was on the order of about 250ish Mbit/s as it happens...
happy benchmarking,
rick jones
El 16/12/2014 18:36, "Georgios Dimitrakakis" <gior...@acmac.uoc.gr
<mailto:gior...@acmac.uoc.gr>> escribió:
Hi all!
In my OpenStack installation (Icehouse and use nova legacy
networking) the VMs are talking to each other over a 1Gbps network link.
My issue is that although file transfers between physical
(hypervisor) nodes can saturate that link transfers between VMs
reach very lower speeds e.g. 30MB/s (approx. 240Mbps).
My tests are performed by scp'ing a large image file (approx. 4GB)
between the nodes and between the VMs.
I have updated my images to use e1000 nic driver but the results
remain the same.
What are any other limiting factors?
Does it has to do with the disk driver I am using? Does it play
significant role the filesystem of the hypervisor node?
Any ideas on how to approach the saturation of the 1Gbps link?
Best regards,
George
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