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The gist is, that at least in the after_idle cong_func for cubic, the state= s for ssthresh and cubic epoch time are not reset, leading to excessive cwn= d values (overflows even) and self-inflicted drops due to dramatic burst tr= ansmissions. Bug Report, or Patch directly to Phabricator (when it is fully qualified)? Best regards,=20 Richard From owner-freebsd-transport@freebsd.org Wed Jan 23 20:41:24 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 7503614B2404; Wed, 23 Jan 2019 20:41:24 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com [IPv6:2a00:1450:4864:20::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1B1078A56A; Wed, 23 Jan 2019 20:41:23 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: by mail-lj1-x234.google.com with SMTP id u89-v6so3224601lje.1; Wed, 23 Jan 2019 12:41:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; 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Wed, 23 Jan 2019 12:41:21 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Freddie Cash Date: Wed, 23 Jan 2019 12:41:09 -0800 Message-ID: Subject: Re: RFC8312 Cubic To: "Scheffenegger, Richard" Cc: "freebsd-transport@freebsd.org" , "freebsd-net@freebsd.org" X-Rspamd-Queue-Id: 1B1078A56A X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=qRViNEHn; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of fjwcash@gmail.com designates 2a00:1450:4864:20::234 as permitted sender) smtp.mailfrom=fjwcash@gmail.com X-Spamd-Result: default: False [-6.60 / 15.00]; ARC_NA(0.00)[]; TO_DN_EQ_ADDR_SOME(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; RCVD_TLS_LAST(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[4.3.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; IP_SCORE(-2.62)[ip: (-8.91), ipnet: 2a00:1450::/32(-2.20), asn: 15169(-1.90), country: US(-0.08)]; NEURAL_HAM_SHORT(-0.97)[-0.973,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0] X-Mailman-Approved-At: Wed, 23 Jan 2019 20:45:24 +0000 Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 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: Wed, 23 Jan 2019 20:41:24 -0000 On Wed, Jan 23, 2019 at 12:34 PM Scheffenegger, Richard < Richard.Scheffenegger@netapp.com> wrote: > Hi, > > we encounted an issue with the BSD11 cubic implementation during testing, > when dealing with app-stalled and app-limited traffic patterns. > > The gist is, that at least in the after_idle cong_func for cubic, the > states for ssthresh and cubic epoch time are not reset, leading to > excessive cwnd values (overflows even) and self-inflicted drops due to > dramatic burst transmissions. > > Bug Report, or Patch directly to Phabricator (when it is fully qualified)? > Search the freebsd-stable mailing list archives for the thread with subject line: HEADS UP: TCP CUBIC Broken on 12.0-RELEASE/STABLE https://lists.freebsd.org/pipermail/freebsd-stable/2018-December/090255.html An Errata Notice should be going out sometime this month-ish. -- Freddie Cash fjwcash@gmail.com From owner-freebsd-transport@freebsd.org Thu Jan 24 00:11:09 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 AAD4614B6C9A; 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