From mboxrd@z Thu Jan  1 00:00:00 1970
From: gmate.amit@gmail.com (Kumar amit mehta)
Date: Tue, 26 Mar 2013 11:54:56 -0700
Subject: relationship between cpu_affinity and Packet RX Processing
In-Reply-To: <20130326184555.GA23561@worldash.org>
References: <20130326183133.GA6146@gmail.com>
	<20130326184555.GA23561@worldash.org>
Message-ID: <20130326185456.GA6868@gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Tue, Mar 26, 2013 at 11:45:55AM -0700, Arlie Stephens wrote:
> I don't know for sure what linux does, but the NICs I've seen with
> multiple queues tend to select queues by hashing incoming packets
> based on source IP, sourse port, destination IP, destination port and
> (if TCP) protocol.  
> 
> This is done because you generally want all packets for a given
> connection in the same queue. 
> 
> For a single ping, always to the same destination, all packets will
> hash the same, and so wind up in the same queue. 
>

I think what you are referring to is called RSS(Recieve side scalling), which
I think is a different feature. IIRC, windows ndis driver implements this
feature.