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 11:11:53 +0200 Message-ID: <4F83F959.3070302@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> 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-ee0-f46.google.com ([74.125.83.46]:45272 "EHLO mail-ee0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751150Ab2DJJMB (ORCPT ); Tue, 10 Apr 2012 05:12:01 -0400 Received: by eekc41 with SMTP id c41so1254062eek.19 for ; Tue, 10 Apr 2012 02:11:57 -0700 (PDT) In-Reply-To: <1334047544.3126.14.camel@edumazet-glaptop> Sender: netdev-owner@vger.kernel.org List-ID: On 04/10/2012 10:45 AM, Eric Dumazet wrote: > On Tue, 2012-04-10 at 10:37 +0200, Michal Simek wrote: >> On 04/10/2012 10:32 AM, Eric Dumazet wrote: >>> On Tue, 2012-04-10 at 10:27 +0200, Eric Dumazet wrote: >>> >>>> BTW, some NIC drivers are known to provide fat skb in their rx path, and >>>> need to be fixed as well. (Some others just lie about skb->truesize to >>>> avoid the tcp slowdown, see my previous iwlwifi patch) >>>> >>>> >>> >>> What is the driver you currently use on your platform ? >> >> Using Xilinx ll_temac(in mainline) and axi_emac. >> > > OK thanks, could you please give us the content > of /proc/sys/net/ipv4/tcp_rmem ? ~ # cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 130048 Let me know if you want to test anything. Thanks, 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