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

[Ruifeng Wang]

> -----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.