From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from resqmta-po-07v.sys.comcast.net (resqmta-po-07v.sys.comcast.net [IPv6:2001:558:fe16:19:96:114:154:166]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 7DAE83B2A4 for ; Thu, 27 May 2021 18:17:50 -0400 (EDT) Received: from resomta-po-16v.sys.comcast.net ([96.114.154.240]) by resqmta-po-07v.sys.comcast.net with ESMTP id mOBnlAXaKiCWImOK5lbPW6; Thu, 27 May 2021 22:17:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcastmailservice.net; s=20180828_2048; t=1622153869; bh=GXR6ij6JXkx74RbPz9hVpoQ553nho4drNrCcmX0fXUo=; h=Received:Received:Received:Subject:To:From:Message-ID:Date: MIME-Version:Content-Type; b=VNRCkgJxaoSMfvYiMCUHbYG23u8kfXBI09zUlSI4Xl5WXKzzLLn0LnL1xWc+yPqQ9 0ifOwaIfmtDV7YrOcP7mZz/1pPfkh/4PoExFQip3RTtsyOUtHqAhSqgkCqflSC8CR/ W82YXdjeqpbJjsaXEOW3M+y/qNvi4GgfzEEI2qgrXkEvGFDMBJyTb4UW9O3sTlV4DY GYshri2JPEa/RBf7XdKJli6cty7/lBB6OUabKiTZAnkEB81Dhwz0WNfsi+/iVL1Zkc j1iuoiXkyXueY9EPuuVl59IZgbiVOBsH0LUiqyUBMJVikBuy2efkIhq3PLwtFRBazs ujgn6/W7OvuIA== Received: from home.sewingwitch.com ([IPv6:2601:644:881:42b0::3f1]) by resomta-po-16v.sys.comcast.net with ESMTPA id mOK4lJQSUtZBamOK5l06QD; Thu, 27 May 2021 22:17:49 +0000 X-Xfinity-VMeta: sc=0.00;st=legit Received: from [10.96.7.39] ([10.96.7.39]) (authenticated bits=0) by home.sewingwitch.com (8.14.7/8.14.7) with ESMTP id 14RMHfck029682 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Thu, 27 May 2021 15:17:42 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 home.sewingwitch.com 14RMHfck029682 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sewingwitch.com; s=default; t=1622153863; bh=GXR6ij6JXkx74RbPz9hVpoQ553nho4drNrCcmX0fXUo=; h=Subject:To:References:From:Date:In-Reply-To:From; b=Zq+obkOPWBGSjZ8cgZD6RmCdN9woEruVgIjLEUohfXMrbRc42SdpyFJag9/0m8KHj mV5qPqYQypz5lm+v3Kd4i+ENzG6Xa4frmqLQ/3YhzmlOV6w1yo6efxHC9HnaTltFQW ERbZvr2em/OXVtQHgYFpsIkpkWS0r65B5FGuTuog= To: bloat@lists.bufferbloat.net References: <20210527074250.E8D8740605C@ip-64-139-1-69.sjc.megapath.net> From: Kenneth Porter Message-ID: <167c73ae-19b0-1b9d-0d89-44a903dfafbd@sewingwitch.com> Date: Thu, 27 May 2021 15:17:41 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: <20210527074250.E8D8740605C@ip-64-139-1-69.sjc.megapath.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-GB X-Scanned-By: MIMEDefang 2.84 on 10.96.0.132 Subject: Re: [Bloat] Educate colleges on tcp vs udp X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 May 2021 22:17:50 -0000 On 5/27/2021 12:42 AM, Hal Murray wrote: > TCP is for things like FTP and web browsing - transferring large chunks of > data. UDP is for simple things like NTP or DNS. TCP is generally implemented > in the kernel. UDP retransmissions are generally implemented by user code. UDP is also for unicast where late is just as bad as never. I've got an IoT sensor that unicasts readings to a PC that uses UDP in a 2-host network. Compare to FireWire's isochronous connections that send unicast packets at a regular rate, intended for streaming media and commonly used for cameras.