netdev - localhost network processing on smp machines

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Message-ID: <c565abbb0711051248g76fbd695w2dbb13f0e014087d@mail.gmail.com>
Date:	Mon, 5 Nov 2007 20:48:39 +0000
From:	"Matthew Faulkner" <matthew.faulkner@...il.com>
To:	netdev@...r.kernel.org
Subject: localhost network processing on smp machines

I'm probably being stupid and very confused here. Appologies if it is
a stupid question.

For a particular test I assign a client to core 1 and a server to core
0. My first assumption was all the sending side kernel TCP/IP
processing will be done on core 1 and all the receiving side
processing on core 0. However, having looked at the linux TCP/IP code,
more specifically the loopback device code, when the loopbacks
dev_queue_xmit function gets called it simply passes the skb to the
netif_rx function. Therefore my question is thus, when i assign the
sending / receiving side to different cores is the actual TCP/IP
processing done the assigned sending / receiving cores ? or is TCP/IP
processing done on the sending side only until a certain point? or is
it simply a single core that does all the TCP/IP processing. If it's
the first two and you have any idea, could you point me where in the
kernel the cores the processing swap over.

Thanks for your help
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