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[85.204.121.218]) by smtp.gmail.com with ESMTPSA id k10sm2684829lfo.76.2019.11.14.07.12.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2019 07:12:55 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 1E4D01803C7; Thu, 14 Nov 2019 16:12:55 +0100 (CET) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= Cc: Daniel Borkmann , Netdev , Alexei Starovoitov , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , bpf , Magnus Karlsson , "Karlsson\, Magnus" , Jonathan Lemon Subject: Re: [RFC PATCH bpf-next 2/4] bpf: introduce BPF dispatcher In-Reply-To: References: <20191113204737.31623-1-bjorn.topel@gmail.com> <20191113204737.31623-3-bjorn.topel@gmail.com> <87o8xeod0s.fsf@toke.dk> <7893c97d-3d3f-35cc-4ea0-ac34d3d84dbc@iogearbox.net> <874kz6o6bs.fsf@toke.dk> X-Clacks-Overhead: GNU Terry Pratchett Date: Thu, 14 Nov 2019 16:12:55 +0100 Message-ID: <87zhgymqyw.fsf@toke.dk> MIME-Version: 1.0 X-MC-Unique: D_WJjrzEM-i4ibaeei32QQ-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Bj=C3=B6rn T=C3=B6pel writes: > On Thu, 14 Nov 2019 at 15:55, Toke H=C3=B8iland-J=C3=B8rgensen wrote: >> > [...] >> I don't really have anything to back it up, but my hunch is that only 4 >> entries will end up being a limit that people are going to end up >> hitting. And since the performance falls off quite the cliff after >> hitting that limit, I do fear that this is something we will hear about >> quite emphatically :) >> > > Hmm, maybe. I have 8 i40e netdevs on my test machine, all running XDP, > but I don't think that's normal for deployments. ;-) Well, the fact that products like this exist kinda indicates that this is something people are doing, no? https://small-tree.net/products/10gbe-switches/p3e10g-6-sr/ -Toke