Re: [PATCH] app/dma_perf: skip case if worker maps to main lcore

[Bruce Richardson <bruce.richardson@intel.com>]

On Tue, Jun 23, 2026 at 10:28:41AM +0530, Rupesh Chiluka wrote:
> Refuse to run DMA/CPU mem-copy cases when any worker is bound to the
> EAL main lcore.
> 

Can you explain a bit more why?

> Signed-off-by: Rupesh Chiluka <rchiluka@marvell.com>
> ---
>  app/test-dma-perf/main.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/app/test-dma-perf/main.c b/app/test-dma-perf/main.c
> index 4249dcfd3d..b6aa5b8401 100644
> --- a/app/test-dma-perf/main.c
> +++ b/app/test-dma-perf/main.c
> @@ -109,6 +109,7 @@ run_test_case(struct test_configure *case_cfg)
>  static void
>  run_test(uint32_t case_id, struct test_configure *case_cfg)
>  {
> +	uint32_t main_lcore = rte_get_main_lcore();
>  	uint32_t nb_lcores = rte_lcore_count();
>  	struct test_configure_entry *mem_size = &case_cfg->mem_size;
>  	struct test_configure_entry *buf_size = &case_cfg->buf_size;
> @@ -122,6 +123,14 @@ run_test(uint32_t case_id, struct test_configure *case_cfg)
>  		return;
>  	}
>  
> +	for (uint32_t i = 0; i < case_cfg->num_worker; i++) {
> +		if (case_cfg->dma_config[i].lcore_dma_map.lcore == main_lcore) {
> +			printf("Case %u: worker %u cannot run on the EAL main lcore (%u).\n",
> +			       case_id, i, main_lcore);
> +			return;
> +		}
> +	}
> +
>  	printf("Number of used lcores: %u.\n", nb_lcores);
>  
>  	if (mem_size->incr != 0)
> -- 
> 2.48.1
>