From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from oproxy6-pub.bluehost.com (oproxy6-pub.bluehost.com [67.222.54.6]) by huchra.bufferbloat.net (Postfix) with SMTP id E165C201A4B for ; Mon, 16 May 2011 06:06:24 -0700 (PDT) Received: (qmail 23858 invoked by uid 0); 16 May 2011 13:16:00 -0000 Received: from unknown (HELO host291.hostmonster.com) (74.220.215.91) by cpoproxy3.bluehost.com with SMTP; 16 May 2011 13:15:59 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=avanw.com; h=Received:From:To:References:In-Reply-To:Subject:Date:Organization:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:Thread-Index:Content-Language:X-Identified-User; b=bVQQnmNEZNMi1v/QDC6zCxDnPIZLGMyYiyRPW7buD+T1OUKcGr691SrCg7Cc0k7LqxV6Vyg5v+wxlAup2y2XHZh8s2OguncX+eoduH57oEgo1jpjH9ceXTR3CB1nQk2p; Received: from c-76-120-76-232.hsd1.co.comcast.net ([76.120.76.232] helo=AVADesk2) by host291.hostmonster.com with esmtpa (Exim 4.69) (envelope-from ) id 1QLxeR-0000c8-M8 for bloat@lists.bufferbloat.net; Mon, 16 May 2011 07:15:59 -0600 From: "Kevin Gross" To: References: <4DB70FDA.6000507@mti-systems.com> <4DC2C9D2.8040703@freedesktop.org> <20110505091046.3c73e067@nehalam> <6E25D2CF-D0F0-4C41-BABC-4AB0C00862A6@pnsol.com> <35D8AC71C7BF46E29CC3118AACD97FA6@srichardlxp2> <1304964368.8149.202.camel@tardy> <4DD9A464-8845-49AA-ADC4-A0D36D91AAEC@cisco.com> <1305297321.8149.549.camel@tardy><014c01cc11a8$de78ac10$9b6a0430$@gross@avanw.com><8A928839-1D91-4F18-8252-F06BD004E37D@cisco.com><5946BA6B-4E00-43AF-A8A2-17FB3769F37B@cisco.com> <2EEFB9D5-E9CC-4612-8D91-F6B382E3C2FB@gmail.com> <13672E5D-7EAE-446A-A8D8-BA85EF2CE72E@cisco.com> <4DD10938.7020703@freedesktop.o rg> In-Reply-To: <4DD10938.7020703@freedesktop.org> Date: Mon, 16 May 2011 07:15:51 -0600 Organization: AVA Networks Message-ID: <012d01cc13cb$61617ed0$24247c70$@gross@avanw.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcwTu70kIfMX1sZzQAGfVd31On9XSAADdg5w Content-Language: en-us X-Identified-User: {1416:host291.hostmonster.com:avanwcom:avanw.com} {sentby:smtp auth 76.120.76.232 authed with kevin.gross@avanw.com} Subject: Re: [Bloat] Jumbo frames and LAN buffers X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 May 2011 13:06:25 -0000 All the stand-alone switches I've looked at recently either do not support 802.3x or support it in the (desireable) manner described in the last paragraph of the linked blog post. I don't believe Ethernet flow control is a factor in current LANs. I'd be interested to know the specifics if anyone sees it differently. My understanding is that 802.1au, "lossless Ethernet", was designed primarily to allow Fibre Channel to be carried over 10 GbE so that SAN and LAN can share a common infrastructure in datacenters. I don't believe anyone intends for it to be enabled for traffic classes carrying TCP. Kevin Gross -----Original Message----- From: bloat-bounces@lists.bufferbloat.net [mailto:bloat-bounces@lists.bufferbloat.net] On Behalf Of Jim Gettys Sent: Monday, May 16, 2011 5:24 AM To: bloat@lists.bufferbloat.net Subject: Re: [Bloat] Jumbo frames and LAN buffers Not necessarily out of knowledge or desire (since it isn't usually controllable in the small switches you buy for home). It can cause trouble even in small environments as your house. http://virtualthreads.blogspot.com/2006/02/beware-ethernet-flow-control.html I know I'm at least three consumer switches deep, and it's not by choice. - Jim