From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Simek Subject: Re: net: more accurate skb truesize - regression on Microblaze Date: Tue, 10 Apr 2012 11:50:16 +0200 Message-ID: <4F840258.6060103@monstr.eu> References: <4F83EB0E.4020104@monstr.eu> <1334046444.3126.12.camel@edumazet-glaptop> <1334046746.3126.13.camel@edumazet-glaptop> <4F83F166.4010208@monstr.eu> <1334047544.3126.14.camel@edumazet-glaptop> <4F83F959.3070302@monstr.eu> <1334049896.3126.23.camel@edumazet-glaptop> <4F83FD7A.5010602@monstr.eu> <1334050698.3126.30.camel@edumazet-glaptop> Reply-To: monstr@monstr.eu Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, John Williams , David Miller To: Eric Dumazet Return-path: Received: from mail-ey0-f174.google.com ([209.85.215.174]:61361 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753053Ab2DJJuV (ORCPT ); Tue, 10 Apr 2012 05:50:21 -0400 Received: by eaaq12 with SMTP id q12so1241017eaa.19 for ; Tue, 10 Apr 2012 02:50:20 -0700 (PDT) In-Reply-To: <1334050698.3126.30.camel@edumazet-glaptop> Sender: netdev-owner@vger.kernel.org List-ID: On 04/10/2012 11:38 AM, Eric Dumazet wrote: > On Tue, 2012-04-10 at 11:29 +0200, Michal Simek wrote: >> On 04/10/2012 11:24 AM, Eric Dumazet wrote: >>> On Tue, 2012-04-10 at 11:11 +0200, Michal Simek wrote: >>> >>>> ~ # cat /proc/sys/net/ipv4/tcp_rmem >>>> 4096 87380 130048 >>> >>> Are they default values, or tuned by admin ? >>> >>> 130048 bytes isnt enough to let TCP open its rcv window. >> >> yep. Default value after powerup. What's wrong with that? >> >> Michal >> > > I guess your tcp performance is driven by these numbers mostly. > > receive window wont grow above 64K in these case. a tcpdump could > confirm the issue. > > Do you have 130000 pages of memory ? 128MB memory and 4k page which is 32k pages. Michal -- Michal Simek, Ing. (M.Eng) w: www.monstr.eu p: +42-0-721842854 Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/ Microblaze U-BOOT custodian