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Message-ID: <20231007155957.aPo0ImuG@linutronix.de> Date: Sat, 7 Oct 2023 17:59:57 +0200 From: Sebastian Andrzej Siewior <bigeasy@...utronix.de> To: Jakub Kicinski <kuba@...nel.org> Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Wander Lairson Costa <hawk@...nel.org> Subject: Re: [PATCH net-next 0/2] net: Use SMP threads for backlog NAPI (or optional). On 2023-10-04 15:46:09 [-0700], Jakub Kicinski wrote: > On Fri, 29 Sep 2023 18:20:18 +0200 Sebastian Andrzej Siewior wrote: > > - Patch #2 has been removed. Removing the warning is still an option. > > > > - There are two patches in the series: > > - Patch #1 always creates backlog threads > > - Patch #2 creates the backlog threads if requested at boot time, > > mandatory on PREEMPT_RT. > > So it is either or and I wanted to show how both look like. > > > > - The kernel test robot reported a performance regression with > > loopback (stress-ng --udp X --udp-ops Y) against the RFC version. > > The regression is now avoided by using local-NAPI if backlog > > processing is requested on the local CPU. > > Not what we asked for, and it doesn't apply. 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. Sebastian
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