From owner-freebsd-stable@FreeBSD.ORG Fri Apr 10 00:14:22 2009 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 463A5106566C for ; Fri, 10 Apr 2009 00:14:22 +0000 (UTC) (envelope-from pyunyh@gmail.com) Received: from ti-out-0910.google.com (ti-out-0910.google.com [209.85.142.185]) by mx1.freebsd.org (Postfix) with ESMTP id CE59F8FC16 for ; Fri, 10 Apr 2009 00:14:21 +0000 (UTC) (envelope-from pyunyh@gmail.com) Received: by ti-out-0910.google.com with SMTP id u5so757996tia.3 for ; Thu, 09 Apr 2009 17:14:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:received:from:date:to:cc :subject:message-id:reply-to:references:mime-version:content-type :content-disposition:in-reply-to:user-agent; bh=yl2r5vB6U7eaLY+H2Y/vdBSchidYVUQxR4iR4jM5NB8=; b=l6pqLPzrKk+x2xHy+Flsn40p9eM49T38xlwAbhptfTtP0qTqz1fxDzxG/yV6+LPLQ1 dGhahLLez5OUBdi8/Es9JycSgzIlcqhmIUONyIF5gBxU2scWAwHrzjJNQQ8PPq0f4oFv i7qoeQ/QjP/b8JIRGyovTaRR43heEfgThzT4c= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:date:to:cc:subject:message-id:reply-to:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=euZWX6qB3aR9IR+Vq+oNkJUoFDUl6AZmrsdaXLpvlFjqR+C1Rtk1IWLw22VkleCeHA q0XB5y9xWj9CdhFgz7Ii1dBIUlBRwIdZ2HRU5MlZwmjSiaB3xkhMoIrAvZ8uVt993DRT bJNpnq1kZbkGfY5rf0m/RAb4/XgHUPlBY3EhM= Received: by 10.110.68.10 with SMTP id q10mr1089539tia.30.1239322460078; Thu, 09 Apr 2009 17:14:20 -0700 (PDT) Received: from michelle.cdnetworks.co.kr ([114.111.62.249]) by mx.google.com with ESMTPS id a4sm2980189tib.11.2009.04.09.17.14.17 (version=SSLv3 cipher=RC4-MD5); Thu, 09 Apr 2009 17:14:18 -0700 (PDT) Received: by michelle.cdnetworks.co.kr (sSMTP sendmail emulation); Fri, 10 Apr 2009 09:15:36 +0900 From: Pyun YongHyeon Date: Fri, 10 Apr 2009 09:15:36 +0900 To: Bjoern Koenig Message-ID: <20090410001536.GH37714@michelle.cdnetworks.co.kr> References: <70ba25e4f1a5e43ab8d99b361235dda2.squirrel@webmail.alpha-tierchen.de> <20090409000427.GD37714@michelle.cdnetworks.co.kr> <2f68678165f20f2e1dae10cb0e63761d.squirrel@webmail.alpha-tierchen.de> <20090409072309.GF37714@michelle.cdnetworks.co.kr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i Cc: stable@freebsd.org Subject: Re: fxp: stalled transfers X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: pyunyh@gmail.com List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Apr 2009 00:14:22 -0000 On Thu, Apr 09, 2009 at 11:02:06AM +0200, Bjoern Koenig wrote: > pyunyh@gmail.com wrote: > > > If you can easily reproduce the issue, can you capture stalled TCP > > session with tcpdump on receiving host?(Make sure to disable Rx > > checksum offload prior to capturing the session.) > > I transferred a 256 kiB file and these are the tcpdumps: > > http://www.alpha-tierchen.de/~bkoenig/fxp0-with-tso.txt > http://www.alpha-tierchen.de/~bkoenig/fxp0-without-tso.txt > > Actually the transfer doesn't stall although ftp and scp told me so. It > becomes incredibly slow. It seems like that the chunks are too large and a > smaller packet will be resent. I decreased the MTU from 1500 to 1492 and > it works fine with TSO enabled. > > I also captured the traffic on my router: > > http://www.alpha-tierchen.de/~bkoenig/fxp0-with-tso-router.txt > http://www.alpha-tierchen.de/~bkoenig/fxp0-without-tso-router.txt > > It reveals a suspect information: "truncated-ip - 8 bytes missing!" > > I almost suppose that this is a PPPoE-related configuration issue and the > fxp driver is not necessarily the problem since decreasing the MTU of the > LAN host solves it. > I think you're right. Thanks a lot!