From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Linux Netdev List <netdev@vger.kernel.org>
Subject: Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0
Date: Wed, 20 Jun 2012 10:21:47 +0200 [thread overview]
Message-ID: <4FE1881B.7030800@profihost.ag> (raw)
In-Reply-To: <1340176940.4604.801.camel@edumazet-glaptop>
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
next prev parent reply other threads:[~2012-06-20 8:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-19 21:08 10GBE performance drop with net.ipv4.tcp_timestamps=0 Stefan Priebe
2012-06-19 21:31 ` Eric Dumazet
2012-06-20 7:00 ` Stefan Priebe - Profihost AG
2012-06-20 7:22 ` Eric Dumazet
2012-06-20 8:21 ` Stefan Priebe - Profihost AG [this message]
2012-06-20 8:41 ` Eric Dumazet
2012-06-20 9:06 ` Stefan Priebe - Profihost AG
2012-06-20 9:12 ` Stefan Priebe - Profihost AG
2012-06-20 9:17 ` Eric Dumazet
2012-06-20 9:25 ` Stefan Priebe - Profihost AG
2012-06-20 9:28 ` Eric Dumazet
2012-06-20 9:33 ` Stefan Priebe - Profihost AG
2012-06-20 9:47 ` Eric Dumazet
2012-06-20 9:50 ` Stefan Priebe - Profihost AG
2012-06-20 10:06 ` Eric Dumazet
2012-06-20 11:08 ` Eric Dumazet
2012-06-20 9:16 ` Eric Dumazet
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