Messages in this thread | | | Date | Mon, 16 Oct 2023 16:53:37 +0200 | From | Sebastian Andrzej Siewior <> | Subject | Re: [PATCH net-next 0/2] net: Use SMP threads for backlog NAPI (or optional). |
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On 2023-10-16 07:17:56 [-0700], Jakub Kicinski wrote: > 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.
Understood.
Wandere/ Juri: Do you have any benchmark/ workload where you would see whether RPS with IPI (now) vs RPS (this patch) shows any regression?
Sebastian
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