[ovs-discuss] Basic Questions about Queues in OVS

Ben Pfaff blp at nicira.com
Fri Oct 3 17:49:40 UTC 2014


On Fri, Oct 03, 2014 at 01:55:56PM +0200, Peter Nase wrote:
> i have a basic question about queue(s) in ovs.
> 
> My Mininet-Network consists of one switch (s1) and three hosts (h1, h2, h3).
> The links between the hosts and the switch are configured as 10000
> Mbps and communication works fine. I started iperf in server mode on
> h3 and use h1, h2 as clients at the same time. Both clients send
> with full speed (2x times 10000 Mbps) to h3, but the link of h3 can
> only process 10000 Mbps.
> 
> For my understandig there must exist a queue that fills, because
> host 3 can handle only 10000 Mbps. Am i'm right?
> 
> Where is this queue exactly located?

There is undoubtedly a queue but it is probably not an OVS queue.  For
established flows, the OVS kernel module doesn't queue packets
internally but just passes them directly onward to the operating
system network stack output driver.



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