From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from emea01-db3-obe.outbound.protection.outlook.com (mail-db3on0081.outbound.protection.outlook.com [157.55.234.81]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client CN "mail.protection.outlook.com", Issuer "MSIT Machine Auth CA 2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 35C6D21F609 for ; Sun, 7 Jun 2015 06:29:39 -0700 (PDT) Authentication-Results: lists.bufferbloat.net; dkim=none (message not signed) header.d=none; Received: from [IPv6:2001:470:183f:da2b::9b1c:6a15] (2001:470:183f:da2b::9b1c:6a15) by DB5PR07MB0935.eurprd07.prod.outlook.com (25.161.200.142) with Microsoft SMTP Server (TLS) id 15.1.184.17; Sun, 7 Jun 2015 13:29:36 +0000 Message-ID: <5574473A.7030106@darbyshire-bryant.me.uk> Date: Sun, 7 Jun 2015 14:29:30 +0100 From: Kevin Darbyshire-Bryant User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Sebastian Moeller References: <5572F7E0.3060602@darbyshire-bryant.me.uk> <0A0D06AB-CC83-4D99-80C6-8E7822C8707C@gmx.de> <557315CC.1060405@darbyshire-bryant.me.uk> <439DCDC5-13C9-4B8E-89A8-90977F90258A@gmx.de> In-Reply-To: <439DCDC5-13C9-4B8E-89A8-90977F90258A@gmx.de> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms060008070604040508080603" X-Originating-IP: [2001:470:183f:da2b::9b1c:6a15] X-ClientProxiedBy: DB4PR02CA0048.eurprd02.prod.outlook.com (10.242.174.176) To DB5PR07MB0935.eurprd07.prod.outlook.com (25.161.200.142) X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:DB5PR07MB0935; X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0; PCL:0; RULEID:(601004)(520003)(5005006)(3002001); SRVR:DB5PR07MB0935; BCL:0; PCL:0; RULEID:; SRVR:DB5PR07MB0935; X-Forefront-PRVS: 0600F93FE1 X-Forefront-Antispam-Report: SFV:NSPM; SFS:(10009020)(6009001)(11905935001)(24454002)(479174004)(5890100001)(36756003)(15975445007)(2950100001)(189998001)(33656002)(46102003)(74482002)(568964001)(92566002)(42186005)(5001960100002)(110136002)(122386002)(86362001)(512944002)(19580395003)(93886004)(65956001)(59896002)(84326002)(83506001)(99136001)(54356999)(87266999)(76176999)(50986999)(65816999)(4001350100001)(87976001)(77156002)(62966003)(7059030)(169013001)(3826002); DIR:OUT; SFP:1101; SCL:1; SRVR:DB5PR07MB0935; H:[IPv6:2001:470:183f:da2b::9b1c:6a15]; FPR:; SPF:None; MLV:sfv; LANG:en; X-OriginatorOrg: darbyshire-bryant.me.uk X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jun 2015 13:29:36.3765 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB5PR07MB0935 Cc: bloat@lists.bufferbloat.net Subject: Re: [Bloat] ADSL, ATM drivers, bloat, education & confusion 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: Sun, 07 Jun 2015 13:30:08 -0000 --------------ms060008070604040508080603 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 06/06/15 19:14, Sebastian Moeller wrote: >> Apparenly it's under my control but I'm fighting my own lack of abilit= ies, trying to sprint a marathon before I can even crawl. Looking at ker= nel sources when I can barely get 'hello world' to compile & run is askin= g for trouble :-) About a day ago I didn't know what an SKB was. https:/= /www.coverfire.com/articles/queueing-in-the-linux-network-stack/ has been= a revelation. > This sounds like you embark on fixing the del driver in your modem; mo= re power to you then. I thank you for your wishes. The reality is that I don't have a clue :-(= I'm looking at package/kernel/lantiq/ltq-atm/src/ltq_atm.c and seeing s= tuff that looks like allocating buffers, setting 'mailboxes' (I'm guessin= g a semaphore type mechanism to tell firmware/hardware that there's a buf= fer waiting and it would be ever so nice if you could put it on the wire = please) but I now doubt that the 'simple 7 lines or so' related to "netde= v_tx_sent_queue" and friends are really as simple as that. I suspect ADSL will be a forgotten technology by the time I understand 'C= ' and Linux kernels well enough to have a chance :-) --------------ms060008070604040508080603 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIINnDCC BjQwggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoT DVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNp Z25pbmcxKTAnBgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3 MTAyNDIxMDE1NVoXDTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1T dGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENs aWVudCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOr 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