netdev - Re: bnx2/5709: Strange interrupts spread

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Message-ID: <AANLkTim3_Gge_neL1v5VTWH-k1x6oAqZVNpu7GFs5nGl@mail.gmail.com>
Date:	Thu, 8 Jul 2010 17:06:44 -0300
From:	Christophe Ngo Van Duc <cngovanduc@...il.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bnx2/5709: Strange interrupts spread

Traffic is IP no doubt about that. Lots of TCP and UDP traffic. I can
provide a very short pcap if you want (lots of traffic so pcap can be
big really quickly).

- The 2 interfaces that have this problems are running in promiscuous
mode (without having an assiged IP address to the interface) inside a
linux bridge interface (br0), but the traffic that is bridged is IP.

- The other 2 that works correctly: are not in promiscuous and have an
IP assigned to the network card.

So I am thinking that for some reason the RSS is activating only when
a specific configuration is set on the interface but not just on if it
is IP traffic or not.

Best Regards,
Christophe.

On Mon, Jul 5, 2010 at 7:56 PM, Rick Jones <rick.jones2@...com> wrote:
> Christophe Ngo Van Duc wrote:
>>
>> Is it a requirement that the interface has an IP address for the TX
>> and RX hash to work?
>
> At the risk of typing into Michael's keyboard, chances are, what the NIC
> does is follow Microsoft's specs for RSS, which as far as I can tell,
> discusses hashing either just on the IP addresses (v4 or v6) or the IP
> addresses and TCP port numbers, so unless Broadcom has an
> enhancement/extension, if the traffic arriving is not TCP/IP and not
> multiple connections, it probably does not get spread-out.
>
> rick jones
>
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