[ovs-dev] [PATCH] ovs-test: A new tool that allows to diagnose connectivity and performance issues

Jesse Gross jesse at nicira.com
Wed Nov 2 22:49:23 UTC 2011


On Mon, Oct 31, 2011 at 5:00 PM, Ansis Atteka <aatteka at nicira.com> wrote:
> UDP performance is currently limited to much lower numbers than for TCP.
> This could be improved in future releases. The cause for UDP performance
> penalty is:
>
> python uses much smaller buffers in sendto() function, and
> UDP-flow control is implemented on events which are timer triggered;

I think this is not that big of a deal.  Since this test is primarily
about vlans and not performance, the absolute number isn't really that
important.  This is particularly true with UDP where for a given size
I would expect it to either work or not.

UDP also almost always has lower performance than TCP anyways because
there are fewer offloads.

I see that you still have a fixed set of sizes to try for UDP packets,
did you look into detecting the MTU?



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