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[204.195.123.141]) by smtp.gmail.com with ESMTPSA id kq10-20020a056a004b0a00b006d9c0dd1b26sm208695pfb.15.2024.02.16.09.22.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Feb 2024 09:22:03 -0800 (PST) Date: Fri, 16 Feb 2024 09:22:01 -0800 From: Stephen Hemminger To: Morten =?UTF-8?B?QnLDuHJ1cA==?= Cc: "Patrick Robb" , "Aaron Conole" , Subject: Re: [PATCH] doc: update minimum Linux kernel version Message-ID: <20240216092201.530fb1af@hermes.local> In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35E9F223@smartserver.smartshare.dk> References: <20240110165751.26569-1-stephen@networkplumber.org> <98CBD80474FA8B44BF855DF32C47DC35E9F124@smartserver.smartshare.dk> <98CBD80474FA8B44BF855DF32C47DC35E9F130@smartserver.smartshare.dk> <20240111115450.3777aea5@hermes.local> <98CBD80474FA8B44BF855DF32C47DC35E9F132@smartserver.smartshare.dk> <20240215190501.582b30f8@hermes.local> <98CBD80474FA8B44BF855DF32C47DC35E9F223@smartserver.smartshare.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On Fri, 16 Feb 2024 09:29:47 +0100 Morten Br=C3=B8rup wrote: > > From: Stephen Hemminger [mailto:stephen@networkplumber.org] > > Sent: Friday, 16 February 2024 04.05 > >=20 > > On Thu, 11 Jan 2024 23:38:07 +0100 > > Morten Br=C3=B8rup wrote: > > =20 > > > > From: Stephen Hemminger [mailto:stephen@networkplumber.org] > > > > Sent: Thursday, 11 January 2024 20.55 > > > > > > > > On Thu, 11 Jan 2024 20:26:56 +0100 > > > > Morten Br=C3=B8rup wrote: > > > > =20 > > > > > > > > > > > > > > > When the documentation specifies a minimum required kernel =20 > > version, =20 > > > > it implicitly claims that DPDK works with that kernel version. =20 > > > > > > > > > > So we should either test with the specified kernel version (which= =20 > > > > requires significant effort to set up, so I=E2=80=99m not going to = ask for > > > > it!), or add a big fat disclaimer/warning that DPDK is not tested = =20 > > with =20 > > > > the mentioned kernel version, and list the kernel versions actually > > > > tested. > > > > > > > > It is much less of an issue than it used to be since there should = =20 > > be no =20 > > > > need for > > > > DPDK specific kernel components. The kernel API/ABI is stable =20 > > across =20 > > > > releases > > > > (with the notable exception of BPF). Therefore the DPDK kernel =20 > > version =20 > > > > dependency > > > > is much less than it used to be. =20 > >=20 > > There are three issues here: > >=20 > > 1. Supporting out of date kernel also means supporting out of date > > build environments > > that maybe missing headers. The recent example was the TAP device > > requiring (or cloning > > which is worse) the headers to the FLOWER classifier. If we move > > the kernel version > > to current LTS, then FLOWER is always present. > > 2. Supporting out of date kernel means more test infrastructure. Some > > CI needs to build > > test on older environments. > > 3. The place it impacts current CI is the building on CentOS7. CentOS7 > > is end of life > > do we have to keep it? The compiler also lack good C11 support so > > not sure how CI keeps working. > >=20 > > The way I view it, if you are on an old system, then stick to old DPDK > > LTS version. > > We don't want to here about regressions on end of life systems. =20 >=20 > The system requirements in the Getting Started Guide [1] says: >=20 > Kernel version >=3D 4.14 > The kernel version required is based on the oldest long term stable kerne= l available at kernel.org when the DPDK version is in development. > Compatibility for recent distribution kernels will be kept, notably RHEL/= CentOS 7. We need to drop CentOS 7 soon. https://www.redhat.com/en/topics/linux/centos-linux-eol CentOS Linux 7 will reach end of life (EOL) on June 30, 2024.=20