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R_SPF_ALLOW(-0.20)[+ip4:40.107.0.0/17]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[netapp.com]; NEURAL_HAM_LONG(-0.96)[-0.958,0]; RCPT_COUNT_ONE(0.00)[1]; RCVD_COUNT_THREE(0.00)[3]; NEURAL_SPAM_SHORT(0.55)[0.554,0]; MX_GOOD(-0.01)[cached: mx1.netapp.iphmx.com]; DKIM_TRACE(0.00)[netapp.onmicrosoft.com:+]; RCVD_IN_DNSWL_NONE(0.00)[48.78.107.40.list.dnswl.org : 127.0.3.0]; TO_DN_EQ_ADDR_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[] X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Jan 2019 11:29:53 -0000 After some investigation about the most effective course of action, which f= ixes the non-ABC misbehavor and the Special case of the sequence space occupied by the SYN bit, I came up with = the following https://reviews.freebsd.org/D19000 It's also fixing the smaller nuisance of the 1 byte cwnd inflation for SYN = when doing ABC. In case the SYN,ACK or final ACK already contain data, this patch won't cha= nge the processing order. The common case of these segments containing no data is handled by updating= snd_una before additional ACK processing can inflate the initial window, matching previous comments i= n the code about the processing flow again. A couple of reviewers would be highly appreciated in this core area of sess= ion set-up, so that I've not missed any side-effect. Also, I don't know how to bind https://bugs.freebsd.org/bugzilla/show_bug.c= gi?id=3D235256 against this patch. Best regards, Richard -----Original Message----- Hi, Just added this comment to D18940. Would appreciate it, if someone other th= an me can confirm this behavior, which may have been present for some time = already. Also, I found some other oddities around ABC calculation in modular congest= ion control, but want to discuss them internally first; if anyone is having= time and wants to also investigate, please PM. Best regards, Richard Subject: [Differential] D18940: Consolidate Initial Window calculations I was just starting to validate something around RTO, and found, that the= effective IW is now actually 11 SMSS, not 10 MSS, when NOT doing ABC (net.= inet.tcp.rfc3465=3D0). I suspect, the final ACK of the 3WHS is already processed in the normal A= CK path, increasing cwnd at that point by one MSS. Here is the corresponding Packetdrill script (named for what I wanted to = validate, before hitting this). F4175462: newreno-slowstart-after-rto.pkt REPOSITORY rS FreeBSD src repository CHANGES SINCE LAST ACTION https://reviews.freebsd.org/D18940/new/ REVISION DETAIL https://reviews.freebsd.org/D18940 EMAIL PREFERENCES https://reviews.freebsd.org/settings/panel/emailpreferences/ To: rscheff_gmx.at, #transport, tuexen Cc: imp, thj, rscheff_gmx.at _______________________________________________ freebsd-transport@freebsd.org mailing list https://lists.freebsd.org/mailma= n/listinfo/freebsd-transport To unsubscribe, send any mail to "freebsd-transport-unsubscribe@freebsd.org= " From owner-freebsd-transport@freebsd.org Thu Jan 31 18:02:00 2019 Return-Path: Delivered-To: freebsd-transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C681014B1F8B for ; Thu, 31 Jan 2019 18:01:59 +0000 (UTC) (envelope-from Richard.Scheffenegger@netapp.com) Received: from NAM02-CY1-obe.outbound.protection.outlook.com (mail-cys01nam02on062a.outbound.protection.outlook.com [IPv6:2a01:111:f400:fe45::62a]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client CN "mail.protection.outlook.com", Issuer "GlobalSign Organization Validation CA - SHA256 - G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8F1266AFED for ; 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