netdev - Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s

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Date:	Tue, 12 Nov 2013 11:01:26 +0100
From:	Willy Tarreau <w@....eu>
To:	Arnaud Ebalard <arno@...isbad.org>
Cc:	Cong Wang <xiyou.wangcong@...il.com>, edumazet@...gle.com,
	stable@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org
Subject: Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s

Hi Arnaud,

On Tue, Nov 12, 2013 at 10:14:34AM +0100, Arnaud Ebalard wrote:
> Tests for the rgression were done w/ scp, and were hence limited by the
> crypto (16MB/s using arcfour128). But I also did some tests w/ a simple
> wget for a file served by Apache *before* the regression and I never got
> more than 60MB/s from what I recall. Can you beat that? 

Yes, I finally picked my mirabox out of my bag for a quick test. It boots
off 3.10.0-rc7 and I totally saturate one port (stable 988 Mbps) with even
a single TCP stream.

With two systems, one directly connected (dockstar) and the other one via
a switch, I get 2*650 Mbps (a single TCP stream is enough on each).

I'll have to re-run some tests using a more up to date kernel, but that
will probably not be today though.

Regards,
Willy

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