Re: [dpdk-dev] [PATCH] config/x86: add support for AMD platform

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

On Tue, Nov 2, 2021 at 3:53 PM Aman Kumar <aman.kumar@vvdntech.in> wrote:
>
> -Dcpu_instruction_set=znverX meson option can be used
> to build dpdk for AMD platforms. Supported options are
> znver1, znver2 and znver3.
>
> Signed-off-by: Aman Kumar <aman.kumar@vvdntech.in>
> ---
>  config/x86/meson.build              | 9 +++++++++
>  doc/guides/linux_gsg/build_dpdk.rst | 2 +-
>  2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/config/x86/meson.build b/config/x86/meson.build
> index 29f3dea181..21cda6fd33 100644
> --- a/config/x86/meson.build
> +++ b/config/x86/meson.build
> @@ -72,3 +72,12 @@ endif
>  dpdk_conf.set('RTE_CACHE_LINE_SIZE', 64)
>  dpdk_conf.set('RTE_MAX_LCORE', 128)
>  dpdk_conf.set('RTE_MAX_NUMA_NODES', 32)
> +
> +# AMD platform support
> +if get_option('cpu_instruction_set') == 'znver1'
> +    dpdk_conf.set('RTE_MAX_LCORE', 256)
> +elif get_option('cpu_instruction_set') == 'znver2'
> +    dpdk_conf.set('RTE_MAX_LCORE', 512)
> +elif get_option('cpu_instruction_set') == 'znver3'
> +    dpdk_conf.set('RTE_MAX_LCORE', 512)
> +endif

I already replied to a similar patch earlier in this release.
https://inbox.dpdk.org/dev/CAJFAV8z-5amvEnr3mazkTqH-7SZX_C6EqCua6UdMXXHgrcmT6g@mail.gmail.com/

So repeating the same: do you actually _need_ more than 128 lcores in
a single DPDK application?


-- 
David Marchand