From owner-freebsd-net@freebsd.org Thu Feb 25 14:19:36 2021 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 67A36564C70 for ; Thu, 25 Feb 2021 14:19:36 +0000 (UTC) (envelope-from zarychtam@plan-b.pwste.edu.pl) Received: from plan-b.pwste.edu.pl (plan-b.pwste.edu.pl [IPv6:2001:678:618::40]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "plan-b.pwste.edu.pl", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DmZfw1GDnz4nhr; Thu, 25 Feb 2021 14:19:35 +0000 (UTC) (envelope-from zarychtam@plan-b.pwste.edu.pl) Received: from fomalhaut.potoki.eu ([IPv6:2001:470:71:d47:b8a9:64d5:f95b:191d]) (authenticated bits=0) by plan-b.pwste.edu.pl (8.16.1/8.16.1) with ESMTPSA id 11PEJPVI011803 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO); Thu, 25 Feb 2021 15:19:26 +0100 (CET) (envelope-from zarychtam@plan-b.pwste.edu.pl) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=plan-b.pwste.edu.pl; s=plan-b-mailer; t=1614262766; bh=aU4RbBY+fqqBqBV+k2+DIKyTZRyxWXwQV/f5omWhF3I=; h=To:Cc:References:From:Subject:Date:In-Reply-To; b=tkZ02GnkFtWcsGWOjlOsaBiutiXpysuXnUOLy3VysHyPnxaRqqwC5BM/H/ic3MtyV 0vEMJnUQ9JK64Vh7LpkjRRbSzBpmRvbrty2SfD8l9DBMUw1NzCuD812Kmf7pnwvoWb dgjiPiTsaz5OpPnmw94BEuZ5tNOF4LhaKLalVSPgZCWC4XRRaYJ9ELyR39wJnolJUl uMJrxDgVvRK54UIo7t0N30sfJOZqr0NynIq+Oqr7/a4CSLTBQO2Z9WOW/xK/zMw48E ShgEoiUmbqXV0vh5deA3d75zxh7004jV5F5EOstMxFxIbw3PjDvGT1ACCI2lBky0Jj hlonYfCH/6eyQ== X-Authentication-Warning: plan-b.pwste.edu.pl: Host [IPv6:2001:470:71:d47:b8a9:64d5:f95b:191d] claimed to be fomalhaut.potoki.eu To: "Alexander V. Chernikov" , =?UTF-8?Q?Olivier_Cochard-Labb=c3=a9?= Cc: "freebsd-net@freebsd.org" References: <5670cd9a-cd10-2b89-1347-97a6c817c50f@sentex.net> <8696072a-dc25-8eff-04fa-4d1db13bf5cc@plan-b.pwste.edu.pl> <3588111612809020@mail.yandex.ru> <53ef5715-42ce-aad0-9a8b-11d91a9891e3@plan-b.pwste.edu.pl> <301391612827263@mail.yandex.ru> <2642181612914660@mail.yandex.ru> <2951613086198@mail.yandex.ru> <7121614026888@mail.yandex.ru> <7056db64-2e7f-6ad8-54a3-59ff406061cf@plan-b.pwste.edu.pl> <2892341614202492@mail.yandex.ru> From: Marek Zarychta Subject: Re: option FIB_ALGO and dpdk_lpm4 Message-ID: Date: Thu, 25 Feb 2021 15:19:25 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <2892341614202492@mail.yandex.ru> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="beuqgqRGvSuEE2EsikduAmrEVwPyuMFJb" X-Rspamd-Queue-Id: 4DmZfw1GDnz4nhr X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Feb 2021 14:19:36 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --beuqgqRGvSuEE2EsikduAmrEVwPyuMFJb Content-Type: multipart/mixed; boundary="wjnz7aDMutqNcT4VtydCvwW26jRjkv5s9"; protected-headers="v1" From: Marek Zarychta To: "Alexander V. Chernikov" , =?UTF-8?Q?Olivier_Cochard-Labb=c3=a9?= Cc: "freebsd-net@freebsd.org" Message-ID: Subject: Re: option FIB_ALGO and dpdk_lpm4 References: <5670cd9a-cd10-2b89-1347-97a6c817c50f@sentex.net> <8696072a-dc25-8eff-04fa-4d1db13bf5cc@plan-b.pwste.edu.pl> <3588111612809020@mail.yandex.ru> <53ef5715-42ce-aad0-9a8b-11d91a9891e3@plan-b.pwste.edu.pl> <301391612827263@mail.yandex.ru> <2642181612914660@mail.yandex.ru> <2951613086198@mail.yandex.ru> <7121614026888@mail.yandex.ru> <7056db64-2e7f-6ad8-54a3-59ff406061cf@plan-b.pwste.edu.pl> <2892341614202492@mail.yandex.ru> In-Reply-To: <2892341614202492@mail.yandex.ru> --wjnz7aDMutqNcT4VtydCvwW26jRjkv5s9 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable W dniu 24.02.2021 o=C2=A022:40, Alexander V. Chernikov pisze: > 24.02.2021, 10:50, "Olivier Cochard-Labb=C3=A9" : >> On Wed, Feb 24, 2021 at 1:22 AM Marek Zarychta < >> zarychtam@plan-b.pwste.edu.pl> wrote: >> >>> =C2=A0> >>> >>> =C2=A0Please let me ask only one final question. Does adding: >>> >>> =C2=A0net.route.algo.inet.algo=3Ddpdk_lpm4 >>> =C2=A0net.route.algo.inet6.algo=3Ddpdk_lpm6 >>> >>> =C2=A0to /etc/sysctl.conf make any sense? I see that right FIB_ALGO i= s >>> =C2=A0automatically picked up when the module is available. >> >> My understanding is the network stack will switch to the optimum algor= ithm >> regarding the number of routes installed. >> cf "Automatic algorithm selection" chapter here: >> https://reviews.freebsd.org/D27401 >> >> So you don't need to set this sysctl. > To add some points to Olivier's explanation: > indeed, algorithm selection SHOULD happen automatically. > Some things to keep in mind: when the BGP sessions flaps kernel routes = may go from the full-view to near-zero and vice versa. > In that case, automatic selection will switch to lockless_radix for the= range between 10..1000 routes (or similar). Lockless radix schedules reb= uild for every change, so the speed of deleting/adding first 1k routes ma= y be slower than expected. Hello Olivier and Alexander, thank you for explaining this. As far as I have tested setting this from sysctl.conf works for current fib. So to avoid early switching of route algorithms and speed up initial filling of route tables with 850k+ ip routes and 100k+ ip6 routes I'll keep both those setting in /etc/sysctl.conf. --=20 Marek Zarychta --wjnz7aDMutqNcT4VtydCvwW26jRjkv5s9-- --beuqgqRGvSuEE2EsikduAmrEVwPyuMFJb Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEEMOqvKm6wKvS1/ZeCdZ/s//1SjSwFAmA3se0FAwAAAAAACgkQdZ/s//1SjSyV Ugf/RR4hRg5o3K+yCqr9nXBkfYJL7FqRtUOr51pJbW6GPEsNb9Vml7TIpBrOw03F6WoayHXuV+D1 DVaagW9U6NHuhJUa3vj0dJrbBy/wbkW/toawgsXwVEubbiRiBmJJZSNkfZnnmnLPUZdRYzzAOJRe yScdv6EkPpTm6WzCbiHl4BFIoZk9IelwqNZOd8htprIjDkGDqUPCOa8DliOEecvEhiabveiJdLRz vdsw3WltRnkcm8KrWPYI8gq+Z81W/r9o1yyrT3/MRqzUSM9rN8XFgKThx+g0OgPPVVRWEoQtLMNF otel0E3LKZgkyB0rtvB7Rs1k+Ec6Dk3erWpwJA9nYw== =5222 -----END PGP SIGNATURE----- --beuqgqRGvSuEE2EsikduAmrEVwPyuMFJb--