netdev - Re: [Xen-devel] [PATCH net v3 2/2] xen-netfront: respect user provided max

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Date:	Thu, 10 Sep 2015 14:35:17 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>,
	Xen-devel <xen-devel@...ts.xenproject.org>,
	Netdev <netdev@...r.kernel.org>
CC:	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH net v3 2/2] xen-netfront: respect user provided
 max_queues

On 10/09/15 11:18, Wei Liu wrote:
> Originally that parameter was always reset to num_online_cpus during
> module initialisation, which renders it useless.
> 
> The fix is to only set max_queues to num_online_cpus when user has not
> provided a value.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>
Tested-by: David Vrabel <david.vrabel@...rix.com>

David

> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -2132,8 +2132,11 @@ static int __init netif_init(void)
>  
>  	pr_info("Initialising Xen virtual ethernet driver\n");
>  
> -	/* Allow as many queues as there are CPUs, by default */
> -	xennet_max_queues = num_online_cpus();
> +	/* Allow as many queues as there are CPUs if user has not
> +	 * specified a value.
> +	 */
> +	if (xennet_max_queues == 0)
> +		xennet_max_queues = num_online_cpus();
>  
>  	return xenbus_register_frontend(&netfront_driver);
>  }
> 

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