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[204.195.123.141]) by smtp.gmail.com with ESMTPSA id i124-20020a636d82000000b005dc1edf7371sm2164209pgc.9.2024.02.15.19.05.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Feb 2024 19:05:03 -0800 (PST) Date: Thu, 15 Feb 2024 19:05:01 -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: <20240215190501.582b30f8@hermes.local> In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35E9F132@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> 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 Thu, 11 Jan 2024 23:38:07 +0100 Morten Br=C3=B8rup wrote: > > From: Stephen Hemminger [mailto:stephen@networkplumber.org] > > Sent: Thursday, 11 January 2024 20.55 > >=20 > > On Thu, 11 Jan 2024 20:26:56 +0100 > > Morten Br=C3=B8rup wrote: > > =20 > > > > > > > > > When the documentation specifies a minimum required kernel 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 with > > the mentioned kernel version, and list the kernel versions actually > > tested. > >=20 > > It is much less of an issue than it used to be since there should be no > > need for > > DPDK specific kernel components. The kernel API/ABI is stable across > > releases > > (with the notable exception of BPF). Therefore the DPDK kernel version > > dependency > > is much less than it used to be. =20 There are three issues here: 1. Supporting out of date kernel also means supporting out of date build en= vironments that maybe missing headers. The recent example was the TAP device requir= ing (or cloning which is worse) the headers to the FLOWER classifier. If we move the ke= rnel version to current LTS, then FLOWER is always present. 2. Supporting out of date kernel means more test infrastructure. Some CI ne= eds to build test on older environments. 3. The place it impacts current CI is the building on CentOS7. CentOS7 is e= nd of life do we have to keep it? The compiler also lack good C11 support so not su= re how CI keeps working. 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.