Messages in this thread | | | Date | Mon, 16 Oct 2023 11:53:21 +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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Sorry, getting back that late, I was traveling the last two weeks…
On 2023-10-09 18:09:37 [-0700], Jakub Kicinski wrote: > On Sat, 7 Oct 2023 17:59:57 +0200 Sebastian Andrzej Siewior wrote: > > Apologies if I misunderstood. You said to make it optional which I did > > with the static key in the second patch of this series. The first patch > > is indeed not what we talked about I just to show what it would look > > like now that there is no "delay" for backlog-NAPI on the local CPU. > > > > If the optional part is okay then I can repost only that patch against > > current net-next. > > 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.
Sebastian
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