netdev - CPU scheduler to TXQ binding? (ixgbe vs. igb)

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Date:	Wed, 17 Sep 2014 15:26:53 +0200
From:	Jesper Dangaard Brouer <jbrouer@...hat.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	Tom Herbert <therbert@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: CPU scheduler to TXQ binding? (ixgbe vs. igb)

The CPU to TXQ binding behavior of ixgbe vs. igb NIC driver are
somehow different.  Normally I setup NIC IRQ-to-CPU bindings 1-to-1,
with script set_irq_affinity [1].

For forcing use of a specific HW TXQ, I normally force the CPU binding
of the process, either with "taskset" or with "netperf -T lcpu,rcpu".

This works fine with driver ixgbe, but not with driver igb.  That is
with igb, the program forced to specific CPU, can still use another
TXQ. What am I missing?

I'm monitoring this with both:
 1) watch -d sudo tc -s -d q ls dev ethXX
 2) https://github.com/ffainelli/bqlmon

[1] https://github.com/netoptimizer/network-testing/blob/master/bin/set_irq_affinity
-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer
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