From: Luca Boccassi <bluca@debian.org>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com>,
dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 2/2] build: establish an invariant machine type
Date: Wed, 14 Nov 2018 12:05:20 +0000 [thread overview]
Message-ID: <1542197120.11515.11.camel@debian.org> (raw)
In-Reply-To: <20181114115256.GB17424@bricha3-MOBL.ger.corp.intel.com>
On Wed, 2018-11-14 at 11:52 +0000, Bruce Richardson wrote:
> On Wed, Nov 14, 2018 at 11:40:11AM +0000, Luca Boccassi wrote:
> > On Wed, 2018-11-14 at 12:34 +0100, Christian Ehrhardt wrote:
> > > Add the machine definition 'baseline' which is special compared
> > > to 'native' (most optimized for current system) or any explicit
> > > type (external entity has to decide on the type).
> > >
> > > It defaults to the per arch agreed common minimal baseline
> > > needed for DPDK to reasonable work.
> > >
> > > That might not be the most optimized, but the most portable
> > > version while still being able to support the CPU features
> > > required for DPDK.
> > >
> > > Going forward this can be bumped up by the DPDK project, but it
> > > can never be an invariant like 'native'.
> > >
> > > Distributions and other needing portable code are expected to
> > > define the machine as 'baseline'.
> > >
> > > Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.c
> > > om>
> > > ---
> > > config/meson.build | 21 +++++++++++++++++++++
> > > 1 file changed, 21 insertions(+)
> > >
> > > diff --git a/config/meson.build b/config/meson.build
> > > index 1af305f46..23f612457 100644
> > > --- a/config/meson.build
> > > +++ b/config/meson.build
> > > @@ -7,6 +7,27 @@ if meson.is_cross_build()
> > > else
> > > machine = get_option('machine')
> > > endif
> > > +
> > > +# machine type 'baseline' is special, it defaults to the per
> > > arch
> > > agreed common
> > > +# minimal baseline needed for DPDK.
> > > +# That might not be the most optimized, but the most portable
> > > version while
> > > +# still being able to support the CPU features required for
> > > DPDK.
> > > +# This can be bumped up by the DPDK project, but it can never be
> > > an
> > > +# invariant like 'native'
> > > +if machine == 'baseline'
> > > + if host_machine.cpu_family().startswith('x86')
> > > + # matches the old pre-meson build systems
> > > default
> > > + machine = 'corei7'
> > > + elif host_machine.cpu_family().startswith('arm')
> > > + machine = 'armv7a'
> > > + elif host_machine.cpu_family().startswith('aarch')
> > > + # arm64 manages defaults in
> > > config/arm/meson.build
> > > + machine = 'default'
> > > + elif host_machine.cpu_family().startswith('ppc')
> > > + machine = 'power8'
> > > + endif
> > > +endif
> > > +
> > > dpdk_conf.set('RTE_MACHINE', machine)
> > > machine_args = []
> >
> > Acked-by: Luca Boccassi <bluca@debian.org>
> >
>
> No objection in principle, but, for alignment with make build system,
> do we
> want to call this "default" instead? Given a clean slate, "baseline"
> is more
> descriptive, but make already uses "default" for this. Perhaps
> support
> both?
>
> /Bruce
I'm fine with both - but if make already has default, it makes sense to
keep it consistent.
--
Kind regards,
Luca Boccassi
next prev parent reply other threads:[~2018-11-14 12:05 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-14 11:34 [dpdk-dev] [PATCH 1/2] build: avoid non supported -march on ppc (meson) Christian Ehrhardt
2018-11-14 11:34 ` [dpdk-dev] [PATCH 2/2] build: establish an invariant machine type Christian Ehrhardt
2018-11-14 11:40 ` Luca Boccassi
2018-11-14 11:52 ` Bruce Richardson
2018-11-14 12:05 ` Luca Boccassi [this message]
2018-11-14 13:09 ` Christian Ehrhardt
2018-11-14 13:18 ` [dpdk-dev] [PATCH] " Christian Ehrhardt
2018-11-14 13:54 ` Bruce Richardson
2018-11-14 14:33 ` [dpdk-dev] [PATCH v3] " Christian Ehrhardt
2018-11-14 19:39 ` Christian Ehrhardt
2018-11-18 13:24 ` Thomas Monjalon
2018-11-14 19:40 ` [dpdk-dev] [PATCH v4 1/2] build: avoid non supported -march on ppc (meson) Christian Ehrhardt
2018-11-14 19:40 ` [dpdk-dev] [PATCH v4 2/2] build: establish an invariant machine type Christian Ehrhardt
2018-11-18 14:24 ` [dpdk-dev] [PATCH v4 1/2] build: avoid non supported -march on ppc (meson) Thomas Monjalon
2018-11-14 13:06 ` [dpdk-dev] [PATCH 2/2] build: establish an invariant machine type Luca Boccassi
2018-11-14 13:08 ` Christian Ehrhardt
2018-11-14 11:39 ` [dpdk-dev] [PATCH 1/2] build: avoid non supported -march on ppc (meson) Luca Boccassi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1542197120.11515.11.camel@debian.org \
--to=bluca@debian.org \
--cc=bruce.richardson@intel.com \
--cc=christian.ehrhardt@canonical.com \
--cc=dev@dpdk.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).