RE: [PATCH] config/x86: config support for AMD EPYC processors

["Tummala, Sivaprasad" <Sivaprasad.Tummala@amd.com>]

[AMD Official Use Only - General]

Hi DPDK Techboard,

Request to add this topic for discussion in the next techboard meeting.

Thanks & Regards,
Sivaprasad

> -----Original Message-----
> From: Tummala, Sivaprasad <Sivaprasad.Tummala@amd.com>
> Sent: Monday, October 16, 2023 10:44 AM
> To: David Marchand <david.marchand@redhat.com>
> Cc: bruce.richardson@intel.com; konstantin.v.ananyev@yandex.ru; dev@dpdk.org;
> dpdk-techboard <techboard@dpdk.org>; Thomas Monjalon
> <thomas@monjalon.net>
> Subject: RE: [PATCH] config/x86: config support for AMD EPYC processors
>
> [AMD Official Use Only - General]
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> [AMD Official Use Only - General]
>
> > -----Original Message-----
> > From: David Marchand <david.marchand@redhat.com>
> > Sent: Friday, October 6, 2023 1:21 PM
> > To: Tummala, Sivaprasad <Sivaprasad.Tummala@amd.com>
> > Cc: bruce.richardson@intel.com; konstantin.v.ananyev@yandex.ru;
> > dev@dpdk.org; dpdk-techboard <techboard@dpdk.org>; Thomas Monjalon
> > <thomas@monjalon.net>
> > Subject: Re: [PATCH] config/x86: config support for AMD EPYC
> > processors
> >
> > Caution: This message originated from an External Source. Use proper
> > caution when opening attachments, clicking links, or responding.
> >
> >
> > On Mon, Sep 25, 2023 at 5:11 PM Sivaprasad Tummala
> > <sivaprasad.tummala@amd.com> wrote:
> > >
> > > From: Sivaprasad Tummala <Sivaprasad.Tummala@amd.com>
> > >
> > > By default, max lcores are limited to 128 for x86 platforms.
> > > On AMD EPYC processors, this limit needs to be increased to leverage
> > > all the cores.
> > >
> > > The patch adjusts the limit specifically for native compilation on
> > > AMD EPYC CPUs.
> > >
> > > Signed-off-by: Sivaprasad Tummala <Sivaprasad.Tummala@amd.com>
> >
> > This patch is a revamp of
> >
> http://inbox.dpdk.org/dev/BY5PR12MB3681C3FC6676BC03F0B42CCC96789@BY5PR
> > 12MB3681.namprd12.prod.outlook.com/
> > for which a discussion at techboard is supposed to have taken place.
> > But I didn't find a trace of it.
> >
> > One option that had been discussed in the previous thread was to
> > increase the max number of cores for x86.
> > I am unclear if this option has been properly evaluated/debatted.
> >
> > Can the topic be brought again at techboard?
>
> Hi David,
>
> The patch is intended to detect AMD platforms and enable all CPU cores by default
> on native builds.
>
> As an optimization for memory footprint, users can override this by specifying "-
> Dmax_lcores" option based on DPDK lcores required for their usecases.
>
> Sure, will request to add this topic for discussion at techboard.
> >
> > Thanks.
> >
> > --
> > David Marchand