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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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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