On Wed, Jul 07, 2021 at 06:46:33AM +0000, Ruifeng Wang wrote:
> > -----Original Message-----
> > From: Thomas Monjalon <tho...@monjalon.net>
> > Sent: Wednesday, July 7, 2021 2:32 PM
> > To: Ruifeng Wang <ruifeng.w...@arm.com>
> > Cc: Jan Viktorin <vikto...@rehivetech.com>; jer...@marvell.com; Bruce
> > Richardson <bruce.richard...@intel.com>; dev@dpdk.org;
> > david.march...@redhat.com; nd <n...@arm.com>; Honnappa Nagarahalli
> > <honnappa.nagaraha...@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?
