Messages in this thread | | | Date | Mon, 16 Oct 2023 07:17:56 -0700 | From | Jakub Kicinski <> | Subject | Re: [PATCH net-next 0/2] net: Use SMP threads for backlog NAPI (or optional). |
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On Mon, 16 Oct 2023 11:53:21 +0200 Sebastian Andrzej Siewior wrote: > > Do we have reason to believe nobody uses RPS? > > Not sure what you relate to. I would assume that RPS is used in general > on actual devices and not on loopback where backlog is used. But it is > just an assumption. > The performance drop, which I observed with RPS and stress-ng --udp, is > within the same range with threads and IPIs (based on memory). I can > re-run the test and provide actual numbers if you want.
I was asking about RPS because with your current series RPS processing is forced into threads. IDK how well you can simulate the kind of workload which requires RPS. I've seen it used mostly on proxyies and gateways. For proxies Meta's experiments with threaded NAPI show regressions across the board. So "force-threading" RPS will most likely also cause regressions.
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