Re: [PATCH net v2] xen-netback: bookkeep number of active queues in our own module

[David Miller <davem@davemloft.net>]

From: Wei Liu <wei.liu2@citrix.com>
Date: Mon, 23 Jun 2014 09:40:32 +0100

> On Sun, Jun 22, 2014 at 05:21:05PM -0700, David Miller wrote:
>> From: Wei Liu <wei.liu2@citrix.com>
>> Date: Sun, 22 Jun 2014 14:31:41 +0100
>> 
>> >  
>> > +	/* Initialisation completed, tell core driver the number of
>> > +	 * active queues.
>> > +	 */
>> > +	rtnl_lock();
>> > +	netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues);
>> > +	netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues);
>> > +	rtnl_unlock();
>> > +
>> >  	xenvif_carrier_on(be->vif);
>> 
>> This function _NEVER_ set the number of RX queues beforehand,
>> therefore why are you adding an RX queue adjustment now?
>> 
> 
> As I went through the core driver code I found this to be a missing call
> in previous code.
> 
> "In current Xen multiqueue design, the number of TX queues and RX queues
> are in fact the same. So we need to set the numbers of TX and RX queues
> to the same value."
> 
> Does the above paragraph answers your question? If so, I will add it to
> commit message and resend this patch.

Yes.