[ovs-discuss] Maximum number of Patch port between bridges

[Levente Csikor]

Yepp, Ben has right.

There are a bunch of performance analyses on the Internet that presents 
the throughput of software based switches, like OVS, using multiple cores.
If your traffic is really simple (like a packet generator's simple 
pattern, i.e., when all header information are the same for all the 
packets), and your OVS is also in some kind of simple setup (e.g., 
portforwarding), then you can realize around 15Gbps throughput on one 
core (newer Intel Xeon or Core architectures and DPDK driver).

Just try to assign more cores to OVS! In case of kernel space driver, 
OVS automatically do this for you, i.e., not merely OVS itself but the 
scheduler of your OS, or use user-space drivers like Intel's DPDK, where 
you can explicitly assign specific cores to the OVS system (vswitchd per 
se).

You can also achieve similar performance with more complex traffic 
patterns but the same OVS setup (portforward), when RSS (receive side 
scaling) becomes enabled, i.e., when L3 and above header information is 
changing in each packet.



On 07/04/2016 11:30 PM, Ben Pfaff wrote:
> On Mon, Jul 04, 2016 at 08:52:15PM +0530, Kapil Adhikesavalu wrote:
>> I believe, at any of point time, only one flow can be processed in a
>> bridge. We can't do multiprocessing here within a bridge. Correct me if am
>> wrong.
> This is wrong.

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