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

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Date:	Thu, 09 Apr 2015 03:01:32 -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 02:24 -0700, Eric Dumazet wrote:

> 
> 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
> 
> ip netns exec vclient /bin/bash
> ping 10.10.23.23
> <no frame is sent>
> 

Same problem if I run pristine 3.19

lpaa23:~/t# ip netns exec vclient /bin/bash
lpaa23:~/t# ip ro get 10.10.23.23
10.10.23.23 via 10.10.40.129 dev veth0  src 10.10.40.1 
    cache 
lpaa23:~/t# nstat
#kernel
lpaa23:~/t# ping 10.10.23.23
PING 10.10.23.23 (10.10.23.23) 56(84) bytes of data.
^C
--- 10.10.23.23 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms

lpaa23:~/t# nstat
#kernel
IcmpOutErrors                   2                  0.0
IcmpOutEchoReps                 2                  0.0
IcmpMsgOutType8                 2                  0.0

lpaa23:~/t# grep . `find /proc/sys/net/ipv4 -name forwarding`
/proc/sys/net/ipv4/conf/all/forwarding:1
/proc/sys/net/ipv4/conf/default/forwarding:1
/proc/sys/net/ipv4/conf/gre0/forwarding:1
/proc/sys/net/ipv4/conf/gretap0/forwarding:1
/proc/sys/net/ipv4/conf/lo/forwarding:1
/proc/sys/net/ipv4/conf/sit0/forwarding:1
/proc/sys/net/ipv4/conf/veth0/forwarding:1



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