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From: Stephen Hemminger <stephen@networkplumber.org>
To: "Morten Brørup" <mb@smartsharesystems.com>
Cc: "Patrick Robb" <probb@iol.unh.edu>,
	"Aaron Conole" <aconole@redhat.com>, <dev@dpdk.org>
Subject: Re: [PATCH] doc: update minimum Linux kernel version
Date: Fri, 16 Feb 2024 09:22:01 -0800	[thread overview]
Message-ID: <20240216092201.530fb1af@hermes.local> (raw)
In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35E9F223@smartserver.smartshare.dk>

On Fri, 16 Feb 2024 09:29:47 +0100
Morten Brørup <mb@smartsharesystems.com> wrote:

> > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > Sent: Friday, 16 February 2024 04.05
> > 
> > On Thu, 11 Jan 2024 23:38:07 +0100
> > Morten Brørup <mb@smartsharesystems.com> wrote:
> >   
> > > > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > > > Sent: Thursday, 11 January 2024 20.55
> > > >
> > > > On Thu, 11 Jan 2024 20:26:56 +0100
> > > > Morten Brørup <mb@smartsharesystems.com> wrote:
> > > >  
> > > > >
> > > > >
> > > > > When the documentation specifies a minimum required kernel  
> > version,  
> > > > it implicitly claims that DPDK works with that kernel version.  
> > > > >
> > > > > So we should either test with the specified kernel version (which  
> > > > requires significant effort to set up, so I’m 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.
> > > >
> > > > 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.  
> > 
> > There are three issues here:
> > 
> > 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 Supporting out of date kernel also means supporting out of date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 Supporting out of date kernel means more test infrastructure.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.
> > 
> > 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.  
> 
> The system requirements in the Getting Started Guide [1] says:
> 
> Kernel version >= 4.14
> The kernel version required is based on the oldest long term stable kernel 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. 

  reply	other threads:[~2024-02-16 17:22 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-10 16:57 Stephen Hemminger
2024-01-11  9:18 ` Morten Brørup
2024-01-11 18:48   ` Aaron Conole
2024-01-11 19:02   ` Patrick Robb
2024-01-11 19:26     ` Morten Brørup
2024-01-11 19:50       ` Patrick Robb
2024-01-11 19:54       ` Stephen Hemminger
2024-01-11 22:38         ` Morten Brørup
2024-02-16  3:05           ` Stephen Hemminger
2024-02-16  8:29             ` Morten Brørup
2024-02-16 17:22               ` Stephen Hemminger [this message]
2024-02-16 17:42               ` Stephen Hemminger
2024-02-17 19:48                 ` Patrick Robb
2024-07-29 20:07                 ` Thomas Monjalon
2024-07-30 23:27                   ` Stephen Hemminger
2024-07-30 23:40                   ` [PATCH] doc: no longer support end of life CentOS versions Stephen Hemminger
2024-11-19 15:34                     ` Thomas Monjalon
2024-11-19 18:40                       ` Stephen Hemminger
2024-11-19 19:38                         ` Thomas Monjalon
2024-11-19 23:09                     ` [PATCH v2] " Stephen Hemminger

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