netdev - Re: [RFC net-next (v2) 14/14] ixgbevf: set maximal number of default RSS queues

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Message-ID: <1340639591.2486.25.camel@lb-tlvb-eilong.il.broadcom.com>
Date:	Mon, 25 Jun 2012 18:53:11 +0300
From:	"Eilon Greenstein" <eilong@...adcom.com>
To:	"Alexander Duyck" <alexander.h.duyck@...el.com>
cc:	"Yuval Mintz" <yuvalmin@...adcom.com>, davem@...emloft.net,
	netdev@...r.kernel.org,
	"Jeff Kirsher" <jeffrey.t.kirsher@...el.com>,
	"Greg Rose" <gregory.v.rose@...el.com>
Subject: Re: [RFC net-next (v2) 14/14] ixgbevf: set maximal number of
 default RSS queues

On Mon, 2012-06-25 at 08:45 -0700, Alexander Duyck wrote:
> On 06/25/2012 04:45 AM, Yuval Mintz wrote:
> > Signed-off-by: Yuval Mintz <yuvalmin@...adcom.com>
> > Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
> >
> > Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > Cc: Alexander Duyck <alexander.h.duyck@...el.com>
> > Cc: Greg Rose <gregory.v.rose@...el.com>
> > ---
> >  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> > index f69ec42..7889644 100644
> > --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> > +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> > @@ -2023,7 +2023,7 @@ static int ixgbevf_set_interrupt_capability(struct ixgbevf_adapter *adapter)
> >  	 * (roughly) twice the number of vectors as there are CPU's.
> >  	 */
> >  	v_budget = min(adapter->num_rx_queues + adapter->num_tx_queues,
> > -		       (int)(num_online_cpus() * 2)) + NON_Q_VECTORS;
> > +		       netif_get_num_default_rss_queues() * 2) + NON_Q_VECTORS;
> >  
> >  	/* A failure in MSI-X entry allocation isn't fatal, but it does
> >  	 * mean we disable MSI-X capabilities of the adapter. */
> I'm not even sure why you are bothering to alter this driver since it is
> currently single queue only.

Alex,

Can you please explain the logic behind these lines in the current
implementation?
	v_budget = min(adapter->num_rx_queues + adapter->num_tx_queues,
		       (int)(num_online_cpus() * 2)) + NON_Q_VECTORS;
It looks as if you were trying to be generic and support a future in
which this driver will support more than a single queue - to be future
ready, this RFC is replacing the usage of num_online_cpus with
netif_get_num_default_rss_queues. Are you suggesting to remove these
lines all together? Keeping this minimum function with only the
num_online_cpus does not seem right without considering also the new
default value.

Thanks,
Eilon



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