Re: [dpdk-dev] [PATCH v4 3/3] build: add option to enable wait until equal

[Jerin Jacob <jerinjacobk@gmail.com>]

On Wed, Jul 7, 2021 at 5:57 PM Bruce Richardson
<bruce.richardson@intel.com> wrote:
>
> On Wed, Jul 07, 2021 at 06:46:33AM +0000, Ruifeng Wang wrote:
> > > -----Original Message-----
> > > From: Thomas Monjalon <thomas@monjalon.net>
> > > Sent: Wednesday, July 7, 2021 2:32 PM
> > > To: Ruifeng Wang <Ruifeng.Wang@arm.com>
> > > Cc: Jan Viktorin <viktorin@rehivetech.com>; jerinj@marvell.com; Bruce
> > > Richardson <bruce.richardson@intel.com>; dev@dpdk.org;
> > > david.marchand@redhat.com; nd <nd@arm.com>; Honnappa Nagarahalli
> > > <Honnappa.Nagarahalli@arm.com>
> > > Subject: Re: [PATCH v4 3/3] build: add option to enable wait until equal
> > >
> > > 07/07/2021 07:48, Ruifeng Wang:
> > > > Introduce a meson option 'use_wfe' to select wait until equal method.
> > > > The default is disable. Traditional polling loop is used.
> > > > When enabled, architecture specific mechanism is relied on to do the
> > > > wait.
> > >
> > > Why do we need an option?
> > > Can it be automatic to enable it when supported?
> > >
> > The problem is inconsistency in performance on different Arm platforms. We had decided that each platform needs to enable it after some testing.
> >
> Can that not be done via variables in the cross-file for the builds, or via
> automatic detection if it's a native build? Is it likely that individual
> users of DPDK will be knowledgable enough to use this option correctly?

+1 to add this in cross-file instead of the top of config option as
scope if is only for arm64 builds.