netdev - Re: [PATCH net] tcp: avoid multiple ssthresh reductions in on retransmit window

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Message-ID: <1403144937.1225.1.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 18 Jun 2014 19:28:57 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jay Vosburgh <jay.vosburgh@...onical.com>
Cc:	Neal Cardwell <ncardwell@...gle.com>,
	Michal Kubecek <mkubecek@...e.cz>,
	Yuchung Cheng <ycheng@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net] tcp: avoid multiple ssthresh reductions in on
 retransmit window

On Wed, 2014-06-18 at 18:52 -0700, Jay Vosburgh wrote:
> 	The test involves adding 40 ms of delay in and out from machine
> A with netem, then running iperf from A to B.  Once the iperf reaches a
> steady cwnd, on B, I add an iptables rule to drop 1 packet out of every
> 1000 coming from A, then remove the rule after 10 seconds.  The behavior
> resulting from this closely matches what I see on the real systems.

Please share the netem setup. Are you sure you do not drop frames on
netem ? (considering you disable GSO/TSO netem has to be able to store a
lot of packets)




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