netdev - Re: One way TCP bottleneck over 6 x Gbit tecl aggregated link // Kernel issue

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Date:	Mon, 23 Mar 2015 01:57:44 +0100
From:	Wolfgang Rosner <wrosner@...net.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: One way TCP bottleneck over 6 x Gbit tecl aggregated link // Kernel issue

Hello, Eric,

It's the kernel, stupid me....

I can't belive it:

I just bootet my gatway into a debian kernel, and it works right away:
	5.93 Gbits/sec	over a single TCP connection :-)))

root@...ncher:~# cat /proc/version
Linux version 3.16.0-0.bpo.4-amd64 (debian-kernel@...ts.debian.org) (gcc 
version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.16.7-ckt4-3~bpo70+1 
(2015-02-12)

as opposed to vanilla 3.19, which was running in the previous tests.

=====================
the sad thing is, that I had to remove the "udba=notify" option from my 
aufs-layered nfsroots mimics.
So anytime I make config-Changes or add packages to the blade setup, I have to 
run a script to remount all nfs roots, to get the blade known of the change.
(this was the reason why I went for 3.19)
======================

Therefore, I would be glad to get it working with 3.19, too.
And I hope that you, too, were eager to rule out the possibility of a 
regression bug :-)

So, what could had have happend:
- regression bug somewhere in the kernel
- broken compatibility between 3.16 and 3.19 (maybe the iproute2 tools?)
- broken compatibility between Vanilla and Debian
- ????

Are you ready to assist me on this track?

Wolfgang Rosner

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