From owner-freebsd-net@FreeBSD.ORG Sun Aug 24 05:55:48 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3F9761065681 for ; Sun, 24 Aug 2008 05:55:48 +0000 (UTC) (envelope-from mat.macy@gmail.com) Received: from rv-out-0506.google.com (rv-out-0506.google.com [209.85.198.233]) by mx1.freebsd.org (Postfix) with ESMTP id 0A2D68FC3A for ; Sun, 24 Aug 2008 05:55:47 +0000 (UTC) (envelope-from mat.macy@gmail.com) Received: by rv-out-0506.google.com with SMTP id b25so1859967rvf.43 for ; Sat, 23 Aug 2008 22:55:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender :to:subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references :x-google-sender-auth; bh=xKTWfneHZ2P/qlVKwKkepEXVqxGO3YQOVdlElPO+pxY=; b=G9NcXSnYwe0C3yGbqFiPmccupmWnGRP3+x5K6GeLKgBh9kzZw0BLo57WTU/votPIeP ckUpEy4V5Y1Fps3S4MEHuOvV2q4cKRLrjNyRCZnr2Oe5hNTvQBVfdbW8fy9uq6RYeU4W ufbzSJDRnL2R9wS6j73ZFkQIeE3fPjE45gSe8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references:x-google-sender-auth; b=Aun0fTIkEwfYCnwpoTzIwGnfjiQ+PXrbrXlt8h4eHm7zjYyoH57mGSmXMTsBUAl+wx wfT+a0xcdBaftIopQ8ddruLgnNp3Gn3cOAsl9Js0WaGSRxUjUq5qTw1e8VRP+OtbkVDI V/tfssTWZuB7Ya7g3mWtzF0zl443RZDGmSG/Q= Received: by 10.141.49.6 with SMTP id b6mr1439908rvk.89.1219557347164; Sat, 23 Aug 2008 22:55:47 -0700 (PDT) Received: by 10.141.101.21 with HTTP; Sat, 23 Aug 2008 22:55:47 -0700 (PDT) Message-ID: <3c1674c90808232255s30a6fce7ma8e081e935a6adbc@mail.gmail.com> Date: Sat, 23 Aug 2008 22:55:47 -0700 From: "Kip Macy" Sender: mat.macy@gmail.com To: "Julian Elischer" In-Reply-To: <48B0F722.3050005@elischer.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <200808221719.m7MHJY25090566@lava.sentex.ca> <20080822191146.T66593@maildrop.int.zabbadoz.net> <200808221922.m7MJMcUN091064@lava.sentex.ca> <3c1674c90808231916l2c92a8e4sae0f191af31b5870@mail.gmail.com> <200808240312.m7O3CZS0098145@lava.sentex.ca> <48B0F722.3050005@elischer.org> X-Google-Sender-Auth: 2fc70bd142617819 Cc: "Bjoern A. Zeeb" , freebsd-net@freebsd.org, Mike Tancsa Subject: Re: strange TCP issue on RELENG_7 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 Aug 2008 05:55:48 -0000 On Sat, Aug 23, 2008 at 10:52 PM, Julian Elischer wrote: > Mike Tancsa wrote: >> >> At 10:16 PM 8/23/2008, Kip Macy wrote: >>> >>> Can you help me out a bit with your workload? >>> >>> tcp_offload_connect(...) needs to determine which interface an address >>> corresponds to see if that interface supports TCP offload. The code >>> does the exact same thing as ip_output does except it doesn't have the >>> inpcb locked (which isn't used as part of the route lookup). >> >> This is the only RELENG_7 box that I have where it routes tcp packets >> asymmetrically, so that sounds like it might be the portion that is badly >> interacting. The server has just one default gateway, which is out em0, but >> clients all over the net will connect to IP addresses aliased on lo0 and to >> the one IP on em1. But all connections exit out em0 other than connected >> routes of course. >> >> ---Mike >> >>> Julian has worked in this code most recently, maybe he has some idea >>> what is going on. >>> > > huh? wha? I haven't been following this thread.. what's up? > Julian - see previous e-mails, the arp cache gets messed up as a result of calling rtalloc in tcp_offload.c - which is done to determine which interface will be used for connection. Any thoughts on why it may end up with dozens of bogus entries? -Kip