netdev - Re: bnx2/BCM5709: why 5 interrupts on a 4 core system (2.6.33.3)

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Date:	Sun, 16 May 2010 21:24:10 +0200
From:	Krzysztof Olędzki <ole@....pl>
To:	Michael Chan <mchan@...adcom.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bnx2/BCM5709: why 5 interrupts on a 4 core system (2.6.33.3)

On 2010-05-16 20:51, Michael Chan wrote:
> Krzysztof Oledzki wrote:
> 
>>
>> Why the driver registers 5 interrupts instead of 4? How to
>> limit it to 4?
>>
> 
> The first vector (eth0-0) handles link interrupt and other slow
> path events.  It also has an RX ring for non-IP packets that are
> not hashed by the RSS hash.  The majority of the rx packets should
> be hashed to the rx rings eth0-1 - eth0-4, so I would assign these
> vectors to different CPUs.

Thank you for your prompt response.

In my case the first vector must be handling something more:
 - "ping -f 192.168.0.1" increases interrupts on both eth1-0 and eth1-4
 - "ping -f 192.168.0.2" increases interrupts on both eth1-0 and eth1-3
 - "ping -f 192.168.0.3" increases interrupts on both eth1-0 and eth1-1
 - "ping -f 192.168.0.7" increases interrupts on both eth1-0 and eth1-2

            CPU0       CPU1       CPU2       CPU3
  67:    1563979          0          0          0   PCI-MSI-edge      eth1-0
  68:    1072869          0          0          0   PCI-MSI-edge      eth1-1
  69:     137905          0          0          0   PCI-MSI-edge      eth1-2
  70:     259246          0          0          0   PCI-MSI-edge      eth1-3
  71:     760252          0          0          0   PCI-MSI-edge      eth1-4

As you can see, eth1-1 + eth1-2 + eth1-3 + eth1-4 ~= eth1-0.

So, it seems that TX or RX is always handled by the first vector.
I'll try to find if it is TX or RX.

BTW: I'm using .1Q vlans over bonding, does it change anything?

Best regards,

			Krzysztof Olędzki
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