From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0 Date: Wed, 20 Jun 2012 10:21:47 +0200 Message-ID: <4FE1881B.7030800@profihost.ag> References: <4FE0EA33.1000309@profihost.ag> <1340141493.4604.773.camel@edumazet-glaptop> <4FE17522.5050005@profihost.ag> <1340176940.4604.801.camel@edumazet-glaptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Linux Netdev List To: Eric Dumazet Return-path: Received: from mail.profihost.ag ([85.158.179.208]:37742 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753019Ab2FTIVy (ORCPT ); Wed, 20 Jun 2012 04:21:54 -0400 In-Reply-To: <1340176940.4604.801.camel@edumazet-glaptop> Sender: netdev-owner@vger.kernel.org List-ID: 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