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

[Ferruh Yigit]

On 10/15/2021 5:48 PM, Wenwu Ma wrote:
> vswitch can't launch with a 40G i40e port due to device start fails

what is 'vswitch' that is referred? I expect what can't launch should
be this sample app but why referring it as 'vswitch'?

Also patch title describes what is done, better to describe why it is done,
like:
examples/vhost: fix init for devices that has big max queue number

btw, why a device with big max queue number causes failure in the sample app?
Can you please provide more detail on the error? What and why fails on
device start?

> 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 at dpdk.org
> 
> Signed-off-by: Wenwu Ma <wenwux.ma at 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 */
>