netdev - Re: [net-next-2.6 PATCH] net: netif_set_real_num_rx_queues may cap num_rx

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Date:	Wed, 06 Oct 2010 16:31:45 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Matt Carlson <mcarlson@...adcom.com>
Cc:	John Fastabend <john.r.fastabend@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"therbert@...gle.com" <therbert@...gle.com>
Subject: Re: [net-next-2.6 PATCH] net: netif_set_real_num_rx_queues may cap
 num_rx_queues at init time

On Wed, 2010-10-06 at 17:23 +0200, Eric Dumazet wrote:
> Le mercredi 06 octobre 2010 à 16:07 +0100, Ben Hutchings a écrit :
> 
> > The waste of memory is minimal now that we only allocate kobjects for
> > real_num_rx_queues.
> 
> Thats strange, here with tg3 (and mono queue device) :
> 
> 0a:04.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S
> Gigabit Ethernet (rev a3)
> 
> grep . /sys/class/net/eth2/queues/rx-*/rps_cpus
> /sys/class/net/eth2/queues/rx-0/rps_cpus:00000000
> /sys/class/net/eth2/queues/rx-1/rps_cpus:00000000
> /sys/class/net/eth2/queues/rx-2/rps_cpus:00000000
> /sys/class/net/eth2/queues/rx-3/rps_cpus:00000000
> /sys/class/net/eth2/queues/rx-4/rps_cpus:00000000

It looks like I missed a necessary call to
netif_set_real_num_rx_queues() in tg3.  I suggest that Matt should check
and correct this since I got the numbers wrong last time.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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