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Date:	Sun, 9 Mar 2014 01:47:27 -0500
From:	Ming Chen <>
To:	Eric Dumazet <>
Cc:, Erez Zadok <>,
	Dean Hildebrand <>,
	Geoff Kuenning <>
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 <> 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.

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