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

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Date:	Wed, 17 Sep 2014 07:32:39 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <jbrouer@...hat.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: CPU scheduler to TXQ binding? (ixgbe vs. igb)

On Wed, 2014-09-17 at 15:26 +0200, Jesper Dangaard Brouer wrote:
> 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

Have you setup XPS ?

echo 0001 >/sys/class/net/ethX/queues/tx-0/xps_cpus
echo 0002 >/sys/class/net/ethX/queues/tx-1/xps_cpus
echo 0004 >/sys/class/net/ethX/queues/tx-2/xps_cpus
echo 0008 >/sys/class/net/ethX/queues/tx-3/xps_cpus
echo 0010 >/sys/class/net/ethX/queues/tx-4/xps_cpus
echo 0020 >/sys/class/net/ethX/queues/tx-5/xps_cpus
echo 0040 >/sys/class/net/ethX/queues/tx-6/xps_cpus
echo 0080 >/sys/class/net/ethX/queues/tx-7/xps_cpus

Or something like that, depending on number of cpus and TX queues.


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