Re: [dpdk-dev] [PATCH] examples/vhost: fix extend MAX_QUEUES to resolve startup failure

["Yang, Zhiyong" <zhiyong.yang@intel.com>]

Yuanhan,

> -----Original Message-----
> From: Yuanhan Liu [mailto:yliu@fridaylinux.org]
> Sent: Tuesday, January 9, 2018 9:24 PM
> To: Yang, Zhiyong <zhiyong.yang@intel.com>
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] examples/vhost: fix extend MAX_QUEUES
> to resolve startup failure
> 
> On Thu, Jan 04, 2018 at 02:33:32PM +0800, Zhiyong Yang wrote:
> > When binding X710 NIC (i40e driver) to DPDK, vhost sample startups
> > failure.
> > The sample requires that MAX_QUEUES should be defined no less than 320.
> > So, the patch redefines MAX_QUEUES 320 to fix the issue.
> 
> It just makes the issue disappear. It doesn't really fix the issue.
> And I belive we have tried to fix this kind of issues in this way many times.
> (just check the git history). As you known, none of them really worked. You
> just added one more try, which is very likely will be broken again when Intel
> has one more new NIC.
> 
> The error comes from:
> 
>         if (dev_info.max_rx_queues > MAX_QUEUES) {
>                 rte_exit(EXIT_FAILURE,
>                         "please define MAX_QUEUES no less than %u in %s\n",
>                         dev_info.max_rx_queues, __FILE__);
>         }
> 
> I think such check is overkill and we don't really need that. Could you just
> remove such check and do some validations on few difference nics?
> 

Agreed, Such check doesn't help anything, Let me send V2 to remove it if nothing  can be affected.

Thanks
Zhiyong

> Thanks.
> 
> 	--yliu