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

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Message-ID: <alpine.LSU.2.20.1504091127310.24030@nerf40.vanv.qr>
Date:	Thu, 9 Apr 2015 12:26:32 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Linux Networking Developer Mailing List <netdev@...r.kernel.org>
Subject: Re: TSO on veth device slows transmission to a crawl


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 :)

>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.
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