Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752086AbaBISOh (ORCPT ); Sun, 9 Feb 2014 13:14:37 -0500 Received: from mail-pb0-f42.google.com ([209.85.160.42]:38048 "EHLO mail-pb0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751646AbaBISOg (ORCPT ); Sun, 9 Feb 2014 13:14:36 -0500 Message-ID: <1391969674.10160.134.camel@edumazet-glaptop2.roam.corp.google.com> Subject: Re: Poor network performance x86_64.. also with 3.13 From: Eric Dumazet To: Borislav Petkov Cc: Daniel Exner , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Date: Sun, 09 Feb 2014 10:14:34 -0800 In-Reply-To: <20140209153107.GA8614@pd.tnic> References: <52DAD66F.7080306@dragonslave.de> <20140118195026.GA15543@pd.tnic> <52DB0439.2060905@dragonslave.de> <52DDA2CD.9040001@dragonslave.de> <20140120223752.GA3057@pd.tnic> <20140209160511.2f67866f@Mycroft> <20140209153107.GA8614@pd.tnic> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2014-02-09 at 16:31 +0100, Borislav Petkov wrote: > On Sun, Feb 09, 2014 at 04:05:11PM +0100, Daniel Exner wrote: > > > cat /etc/sysctl.d/net.conf > > > net.ipv4.tcp_window_scaling = 1 > > > net.core.rmem_max = 16777216 > > > net.ipv4.tcp_rmem = 4096 87380 16777 > > > net.ipv4.tcp_wmem = 4096 1638 > > > > After removing those values I finally had sane iperf values. > > No idea how those got there, perhaps they made sense when I first setup > > the box, which is some years ago.. > > The only question that is left to clarify now is why do those values > have effect on 3.12.x and not on 3.10... tcp_rmem[2] = 16777 Come on, the 640KB barrier was broken a long time ago ;) Feel free to investigate, I wont ;) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/