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Date: Sun, 9 Mar 2014 01:47:27 -0500 From: Ming Chen <v.mingchen@...il.com> To: Eric Dumazet <eric.dumazet@...il.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 10:37 PM, Eric Dumazet <eric.dumazet@...il.com> wrote: > > The feedback loop you mention should be solved by the patch I sent > today : TCP Small queue make sure that you have no more than 2 packets > per flow on qdisc / TX queues. So on 'fast' flow cannot have 90% of the > packets in the qdisc. cwnd is maintained to very small values, assuming > receiver is behaving normally. > Thanks for the patch. I forgot to mention that excessively big cwnd (or bufferbloat) does play a part in Hash-Cast. We found that using TCP Vegas does not show unfairness even in the presence of hash collision among TCP flows. Comparing Vegas and Cubic, we found that Vegas has a much smaller cwnd. 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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