netdev - Re: 10GBE performance drop with net.ipv4.tcp

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Message-ID: <4FE1881B.7030800@profihost.ag>
Date:	Wed, 20 Jun 2012 10:21:47 +0200
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0

Am 20.06.2012 09:22, schrieb Eric Dumazet:
> On Wed, 2012-06-20 at 09:00 +0200, Stefan Priebe - Profihost AG wrote:
>> Am 19.06.2012 23:31, schrieb Eric Dumazet:
>> Before:
>> http://pastebin.com/raw.php?i=1gVraWVc
>>
>> After:
>> http://pastebin.com/raw.php?i=NSh8Y29s
>
> You have a lot of packet losses
But this ONLY happens with tcp_timestamps=0.


> add "tc -s -d qdisc" , "ifconfig -a " and "ethtool -S ethX" outputs for
> both servers

eth2 is the 10Gb device on both systems
server a has kernel 3.5 server b has rhel 6 kernel

Server A:
# tc -s -d qdisc
RTNETLINK answers: Operation not supported
Dump terminated

Server B (eth2 is the 10GB/s device):
# tc -s -d qdisc
qdisc mq 0: dev eth0 root
  Sent 55151 bytes 555 pkt (dropped 0, overlimits 0 requeues 0)
  rate 0bit 0pps backlog 0b 0p requeues 0
qdisc mq 0: dev eth2 root
  Sent 38374148475 bytes 2774405 pkt (dropped 0, overlimits 0 requeues 4)
  rate 0bit 0pps backlog 0b 0p requeues 4

ifconfig -a:
http://pastebin.com/raw.php?i=M3QHQjSU

ethtool -S:
http://pastebin.com/raw.php?i=Eap05xKc

Thanks again,
Stefan
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