From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe Subject: 10GBE performance drop with net.ipv4.tcp_timestamps=0 Date: Tue, 19 Jun 2012 23:08:03 +0200 Message-ID: <4FE0EA33.1000309@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit To: Linux Netdev List Return-path: Received: from mail.profihost.ag ([85.158.179.208]:37187 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752873Ab2FSVIH (ORCPT ); Tue, 19 Jun 2012 17:08:07 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Hello List, i'm testing 10GBE speed with tweo servers. One with 3.5-rc3 nd thoe other one whith RHEL 6 (2.6.32 kernel). I noticed that setting net.ipv4.tcp_timestamps=0 descreased the performance from 9,7 Full Duplex to 3-4Gb/s. Is this bahviour fine? What should / could i tet? Greets Stefan