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

[Konstantin Ananyev <konstantin.ananyev@huawei.com>]

> -----Original Message-----
> From: Sivaprasad Tummala <sivaprasad.tummala@amd.com>
> Sent: Monday, September 25, 2023 4:10 PM
> To: bruce.richardson@intel.com; konstantin.v.ananyev@yandex.ru
> Cc: dev@dpdk.org; Sivaprasad Tummala <Sivaprasad.Tummala@amd.com>
> Subject: [PATCH] config/x86: config support for AMD EPYC processors
> 
> 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>
> ---
>  config/x86/meson.build | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/config/x86/meson.build b/config/x86/meson.build
> index d8ef50fb40..5355731cef 100644
> --- a/config/x86/meson.build
> +++ b/config/x86/meson.build
> @@ -83,4 +83,21 @@ endif
> 
>  dpdk_conf.set('RTE_CACHE_LINE_SIZE', 64)
>  dpdk_conf.set('RTE_MAX_LCORE', 128)
> +
> +epyc_zen_cores = {
> +    '__znver4__':512,
> +    '__znver3__':256,
> +    '__znver2__':256,
> +    '__znver1__':128
> +    }
> +
> +if get_option('platform') == 'native'
> +    foreach m:epyc_zen_cores.keys()
> +        if cc.get_define(m, args: machine_args) != ''
> +            dpdk_conf.set('RTE_MAX_LCORE', epyc_zen_cores[m])
> +            break
> +        endif
> +    endforeach
> +endif
> +
>  dpdk_conf.set('RTE_MAX_NUMA_NODES', 32)
> --

Acked-by: Konstantin Ananyev <konstantin.ananyev@huawei.com>
 


> 2.34.1