AKASHI Takahiro takahiro.akashi@linaro.org writes:
On Wed, Nov 24, 2021 at 05:49:59AM +0000, Alex Benn??e wrote:
Alex Bennée alex.bennee@linaro.org writes:
Hi Ilias/Akashi-san,
So after the call earlier this week Mike asked me to write-up a EPIC for the measurement work. I think this covers the deployments we want to measure but any feedback is welcome. The Xen documentation talks rather euphemistically about Open vSwitch but I don't know if that is just the management name for using the same network routing internals as the other ePPF ones.
Anyway any thoughts?
Ilias/Akashi,
Any comments before I put this into JIRA cards?
- Do we learn any lessons from the past study like: https://connect.linaro.org/resources/bkk19/bkk19-504/ "BKK19-504 XDP Offload for OPC UA" either on test methods/scenario or performance results?
I think the main takeaway from that is XDP is a useful optimisation. While we want to test the XDP paths we are mainly interested in what effect the virtualisation has.
- You expect that the measurement will be done on the network between a guest VM and a outer (physical) machine (or sensor/camera?). What about vm-vm performance?
For the latency tests I'm suggesting a fixed master machine running Linux directly and a second machine with various configurations as the reflector.
vm-vm performance could be an interesting number but for trying to identify where the bottlenecks are having one of the test connection unchanging will hopefully give more solid numbers.
- If the network between vm and a outside machine does matter, we should also evaluate the case where multiple guests are running and accessing the same (physical) NIC (at least,
virtually).
That would certainly be a good additional test case.
- Should we take TSN switch on the system into consideration?
Wouldn't we need support we don't yet have for that?
-Takahiro Akashi
-- Alex Bennée