netdev - Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are enabled

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Message-ID: <1394372662.20149.92.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 09 Mar 2014 06:44:22 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ming Chen <v.mingchen@...il.com>
Cc:	John Fastabend <john.r.fastabend@...el.com>,
	netdev@...r.kernel.org, Erez Zadok <ezk@....cs.sunysb.edu>,
	Dean Hildebrand <dhildeb@...ibm.com>,
	Geoff Kuenning <geoff@...hmc.edu>
Subject: Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are
 enabled

On Sun, 2014-03-09 at 01:43 -0500, Ming Chen wrote:

> I am trying to experiment using only one queue for all the TCP flows.
> But, how do we force that. I was thinking about XPS. But I just
> realized that /sys/class/net/p3p1/queues/tx-n/xps_cpus only set which
> CPUs can use them. How to let all CPUs choose one single tx queue? Or,
> should I use mqprio and assign all flows to one tc that contains only
> one tx queue?

If you want to use a single queue, just declare a single queue on your
NIC...

ethtool -L eth0 rx 1 tx 1

Multiqueue is not a requirement in your case. You can easily reach line
rate with a single queue on a 10Gbe NIC.




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