Re: [dpdk-dev] [PATCH v1 1/2] devtools: allow test-null.sh to run on ppc64le

[David Marchand <david.marchand@redhat.com>]

On Fri, Feb 14, 2020 at 12:22 AM dwilder <dwilder@us.ibm.com> wrote:
>
> On 2020-02-13 14:17, Thomas Monjalon wrote:
> > 13/02/2020 21:58, dwilder:
> >> On 2020-02-13 12:32, Thomas Monjalon wrote:
> >> > 13/02/2020 21:24, David Wilder:
> >> >> - The --no-huge option requires iova-mode=VA.
> >> >>   On ppc64le iova-mode defaults to PA therefor
> >> >>   VA mode must be explicitly set.
> >> >
> >> > Should we make VA mode automatic when using --no-huge?
> >> > Should we log an error message when using --no-huge with PA mode?
> >>
> >> Logging a messages sounds like a good idea.  Ignoring the users
> >> request
> >> of iova-mode=PA (in the case of x86) and just switching modes would be
> >> bad.
> >
> > Yes, I mean for ppc64, if --no-huge is specified,
> > would you like to change the default to VA mode?
>
> OK, that would be better.
> I will switch to VA when --no-huge is set (ppc64 only).

With no-huge, we can't ensure the physical addresses won't change
(might be different if we locked the pages in memory... but not
possible and/or not handled in eal afaics).
This limitation is generic, not arch specific.


> Add log messages if PA is selected with --no-huge (all arches).

-- 
David Marchand