From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-24-ewr.dyndns.com (mxout-078-ewr.mailhop.org [216.146.33.78]) by lists.bufferbloat.net (Postfix) with ESMTP id 4FB0D2E00B9 for ; Wed, 16 Mar 2011 16:50:17 -0700 (PDT) Received: from scan-22-ewr.mailhop.org (scan-22-ewr.local [10.0.141.244]) by mail-24-ewr.dyndns.com (Postfix) with ESMTP id D6C795CD482 for ; Wed, 16 Mar 2011 23:50:15 +0000 (UTC) X-Spam-Score: -4.0 (----) X-Mail-Handler: MailHop by DynDNS X-Originating-IP: 15.216.28.36 Received: from g1t0029.austin.hp.com (g1t0029.austin.hp.com [15.216.28.36]) by mail-24-ewr.dyndns.com (Postfix) with ESMTP id 88C235CD20E for ; Wed, 16 Mar 2011 23:50:11 +0000 (UTC) Received: from g1t0038.austin.hp.com (g1t0038.austin.hp.com [16.236.32.44]) by g1t0029.austin.hp.com (Postfix) with ESMTP id 99EA038006; Wed, 16 Mar 2011 23:50:10 +0000 (UTC) Received: from [16.89.244.213] (tardy.cup.hp.com [16.89.244.213]) by g1t0038.austin.hp.com (Postfix) with ESMTP id F0C75300B8; Wed, 16 Mar 2011 23:50:09 +0000 (UTC) From: Rick Jones To: richard In-Reply-To: <1300318732.19833.12.camel@amd.pacdat.net> References: <4D7F4121.40307@freedesktop.org> <20110315175942.GA10064@goldfish><1300212877.2087.2155.camel@tardy> <20110315183111.GB2542@tuxdriver.com> <29B06777-CC5F-4802-8727-B04F58CDA9E3@gmail.com> <20110315205146.GF2542@tuxdriver.com> <219C7840-ED79-49EA-929D-96C5A6200401@gmail.com> <20110315151946.31e86b46@nehalam> <1300228592.2087.2191.camel@tardy> <1300229578.2565.29.camel@edumazet-laptop> <87fwqo54n7.fsf@cruithne.co.teklibre.org> <823E2A7B-4F46-4159-8029-BD3B075CC4CE@gmail.com> <87bp1b6fo0.fsf@cruithne.co.teklibre.org> <87bp1b4yh4.fsf@cruithne.co.teklibre.org> <35010A85-C5A4-4133-8707-4E114C65A8C6@gmail.com> <1300318732.19833.12.camel@amd.pacdat.net> Content-Type: text/plain; charset="UTF-8" Date: Wed, 16 Mar 2011 16:50:08 -0700 Message-ID: <1300319408.2087.2281.camel@tardy> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit Cc: bloat Subject: Re: [Bloat] Random idea in reaction to all the discussion of TCPflavours - timestamps? X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list Reply-To: rick.jones2@hp.com List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Mar 2011 23:50:17 -0000 > > Furthermore, I learned that a couple of 10G switch vendors are planning to > > have up to 4 GB of buffer RAM in their next generation of switches. So we > > are not talking about thousands of packets in the buffer, but of millions of > > packets (think of up to 400ms buffering if only a single 10G egress port is > > being loaded in such a switch). Compared to the base RTT of a 10G network (a > > few tens of microseconds, some vendors go even below a microsecond), this is > > even more extreme than the home router / DSLAM scenario... > > > > The stuff for the future involves getting to the designers and getting > them to understand the situation they're putting the rest of the net in > while they play their pissing games with marketing (is there any other > reason for 4 GB of buffer in any switch?), etc. That and getting the > basic research done, measurement facilities in place, and long-term > methodologies to really fix the problem "forever". 4GB shared across N ports no? And 10GBASE-ER can go 40 km. Where might pause and FCoE wedge into this? rick jones