netdev - Re: TSO on veth device slows transmission to a crawl

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Date:	Thu, 09 Apr 2015 08:08:29 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jan Engelhardt <jengelh@...i.de>
Cc:	Linux Networking Developer Mailing List <netdev@...r.kernel.org>
Subject: Re: TSO on veth device slows transmission to a crawl

On Thu, 2015-04-09 at 12:26 +0200, Jan Engelhardt wrote:
> On Thursday 2015-04-09 11:24, Eric Dumazet wrote:
> >> I was finally able to reproduce it reliably, and with just one 
> >> machine/kernel instance (and a number of containers of course).
> >> 
> >> I have uploaded the script mix to
> >> 	http://inai.de/files/tso-1.tar.xz
> >> There is a demo screencast at
> >> 	http://inai.de/files/tso-1.mkv
> >
> >Thanks for providing these scripts, but they do not work on my host
> >running latest net-next
> >
> >Basic IP routing seems not properly enabled, as even ping does not work
> >to reach 10.10.23.23
> 
> Since I have net.ipv4.conf.all.forwarding,net.ipv4.ip_forward=1
> this probably got inherited into the containers, so I did not
> write it down into the scripts.
> Enable it :)

The thing is : It is enabled.

> 
> >Have you tried net-next as well ?
> 
> I have now - a quick test yields no problem. Next I will do a reverse 
> bisect just for the fun.

Cool ;)

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