Re: [dpdk-dev] [PATCH v3] examples/vhost: change the default value of NIC's max queues

[Maxime Coquelin <maxime.coquelin@redhat.com>]

On 10/15/21 18:48, Wenwu Ma wrote:
> vswitch can't launch with a 40G i40e port due to device start fails
> if NIC’s max queues > the default number of 128, so, we changed
> the default value from 128 to 512.
> 
> Fixes: 4796ad63ba1f ("examples/vhost: import userspace vhost application")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Wenwu Ma <wenwux.ma@intel.com>
> ---
>   examples/vhost/main.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/examples/vhost/main.c b/examples/vhost/main.c
> index bc3d71c898..36969a4de5 100644
> --- a/examples/vhost/main.c
> +++ b/examples/vhost/main.c
> @@ -29,7 +29,7 @@
>   #include "main.h"
>   
>   #ifndef MAX_QUEUES
> -#define MAX_QUEUES 128
> +#define MAX_QUEUES 512
>   #endif
>   
>   /* the maximum number of external ports supported */
> 

As discussed, this is far from ideal, but let's use our time to remove
gaps in Vhost testing with testpmd so that we can remove this example
later.

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime