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Date: Sun, 9 Mar 2014 01:43:32 -0500 From: Ming Chen <v.mingchen@...il.com> To: Eric Dumazet <eric.dumazet@...il.com>, John Fastabend <john.r.fastabend@...el.com> Cc: 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 Sat, Mar 8, 2014 at 10:29 PM, Eric Dumazet <eric.dumazet@...il.com> wrote: > > You do not need multiqueue to send traffic for few TCP flows, because > packets will reach 64KB size very fast. 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 fairness, then multiqueue wont do it, unless you add some > kind of shaper. > > TCP is handling one flow, not an arbitrary number of flows. > > If you need fairness, then you need an AQM like FQ. > Yeah. You are right. However, if we really want fairness while using mq, then should AQM and FQ be aware of mq or even the scheduling of the queues? Best, Ming -- 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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