> From: Kevin Traynor [mailto:ktray...@redhat.com] > Sent: Tuesday, 17 October 2023 11.45 > > On 16/10/2023 06:20, Tummala, Sivaprasad wrote: > > [AMD Official Use Only - General] > > > > Hi DPDK Techboard, > > > > Request to add this topic for discussion in the next techboard > meeting. > > > > Hi Sivaprasad, > > Are you or a representative (Ferruh?) able to attend the techboard > meeting (3pm UTC Wednesday) to discuss this item? > > thanks, > Kevin. > > > Thanks & Regards, > > Sivaprasad > > > >> From: Tummala, Sivaprasad <sivaprasad.tumm...@amd.com> > >> Sent: Monday, October 16, 2023 10:44 AM > >> > >>> From: David Marchand <david.march...@redhat.com> > >>> Sent: Friday, October 6, 2023 1:21 PM > >>> > >>> On Mon, Sep 25, 2023 at 5:11 PM Sivaprasad Tummala > >>> <sivaprasad.tumm...@amd.com> wrote: > >>>> > >>>> From: Sivaprasad Tummala <sivaprasad.tumm...@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.tumm...@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.
Here are the minutes from the previous techboard discussions: [1]: http://inbox.dpdk.org/dev/YZ43U36bFWHYClAi@platinum/ [2]: http://inbox.dpdk.org/dev/20211202112506.68acaa1a@hermes.local/ AFAIK, there has been no progress with dynamic max_lcores, so I guess the techboard's conclusion still stands: There is no identified use-case where a single application requires more than 128 lcores. If a case a use-case exists for a single application that uses more than 128 lcores, the TB is ok to update the default config value. > >>> > >>> 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. This is done on native ARM builds, so why not on native X86 builds too? > >> > >> 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 > >
