From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from COL004-OMC2S9.hotmail.com (col004-omc2s9.hotmail.com [65.55.34.83]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id E00193B2A3 for ; Thu, 2 Mar 2017 23:31:25 -0500 (EST) Received: from NAM01-SN1-obe.outbound.protection.outlook.com ([65.55.34.73]) by COL004-OMC2S9.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.23008); Thu, 2 Mar 2017 20:31:25 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hotmail.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=/3/y644CHalgC+Z4yiSio6THgCYLBtMbTwY8poC7JaI=; b=nh0bbpscUVGaUwAJ12AQ5jbW6GRz18nwAWJtP8MyenwfNFio8nHyIp32xGlXBJcdTy/pMEkfNF8B+Bt8b/+5MwPgjoW24vBDiVYNGtbh4zcO/jFUOg9HjAnUxCA4BCbadntnwRG9IIfg41myQMlTIL69ZKEZHzK1O2fVRGM5qsTPjDkSsYQrbN+Xhr627D0x3889VV5WEU3SQF8LXa5OmFt+nZhItWCTnbFhZw/4buV/9pTl027HwjaDN/roBLpViBS+Hbwvee5BC6mc7MXFsChJMHy/uKSVVEwKgRQWbLH7rxm+v1yf8//TaaGogZp/eCc9UQXJJFKJ/+SFVFYesw== Received: from SN1NAM01FT055.eop-nam01.prod.protection.outlook.com (10.152.64.53) by SN1NAM01HT121.eop-nam01.prod.protection.outlook.com (10.152.64.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.933.11; Fri, 3 Mar 2017 04:31:24 +0000 Received: from DM5PR11MB1564.namprd11.prod.outlook.com (10.152.64.58) by SN1NAM01FT055.mail.protection.outlook.com (10.152.65.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.933.11 via Frontend Transport; Fri, 3 Mar 2017 04:31:24 +0000 Received: from DM5PR11MB1564.namprd11.prod.outlook.com ([10.172.37.20]) by DM5PR11MB1564.namprd11.prod.outlook.com ([10.172.37.20]) with mapi id 15.01.0947.015; Fri, 3 Mar 2017 04:31:23 +0000 From: Eric Luehrsen To: Jonathan Morton , John Yates CC: "cake@lists.bufferbloat.net" , "lede-dev@lists.infradead.org" , =?Windows-1252?Q?Dave_T=E4ht?= Thread-Topic: [LEDE-DEV] [Cake] Cake SQM killing my DIR-860L - was: [17.01] Kernel: bump to 4.4.51 Thread-Index: AQHSk7CcSJePnm8gj0qe+T+KkDHBD6GCO56AgABLAQA= Date: Fri, 3 Mar 2017 04:31:23 +0000 Message-ID: References: <07479F0A-40DD-44E5-B67E-28117C7CF228@gmx.de> <1488400107.3610.1@smtp.autistici.org> <2B251BF1-C965-444D-A831-9981861E453E@gmx.de> <1488484262.16753.0@smtp.autistici.org> <98E899EF-5E66-42CC-88AA-79FA80A4F228@gmail.com> In-Reply-To: <98E899EF-5E66-42CC-88AA-79FA80A4F228@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; 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SFV:NSPM; SFS:(10019020)(98900014); DIR:OUT; SFP:1102; SCL:1; SRVR:SN1NAM01HT121; H:DM5PR11MB1564.namprd11.prod.outlook.com; FPR:; SPF:None; LANG:en; x-ms-office365-filtering-correlation-id: 26550498-9734-442d-e4b3-08d461ee2585 x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(22001)(201702061074)(5061506573)(5061507331)(1603103135)(1601125254)(1603101448)(1701031045); SRVR:SN1NAM01HT121; x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(432015087)(444000031); SRVR:SN1NAM01HT121; BCL:0; PCL:0; RULEID:; SRVR:SN1NAM01HT121; x-forefront-prvs: 0235CBE7D0 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: hotmail.com X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2017 04:31:23.6013 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1NAM01HT121 X-OriginalArrivalTime: 03 Mar 2017 04:31:25.0324 (UTC) FILETIME=[04B2BCC0:01D293D7] X-Mailman-Approved-At: Mon, 06 Mar 2017 05:33:25 -0500 Subject: Re: [Cake] [LEDE-DEV] Cake SQM killing my DIR-860L - was: [17.01] Kernel: bump to 4.4.51 X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Mar 2017 04:31:26 -0000 On 03/02/2017 07:02 PM, Jonathan Morton wrote: >> On 3 Mar, 2017, at 01:55, John Yates wrote: >> >> The virtue of a prime number of buckets is that when you mod >> your 32-bit hash value to get a bucket index you harvest _all_ >> of the entropy in the hash, not just the entropy in the bits you >> preserve. > True, but you incur the cost of a division, which is very much non-trivia= l on ARM CPUs, which are increasingly common in CPE. > > - Jonathan Morton Also with SQM you may not what idealized entropy in your queue=20 distribution. It is desired by some to have host-connection fairness,=20 and not so much interest in stream-type fairness. So overlap in a few=20 hash "tags" may not be always such a bad thing depending on how it works=20 itself out.