From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 803EE3B29E for ; Fri, 5 Apr 2019 03:42:37 -0400 (EDT) Received: by mail-qt1-x82f.google.com with SMTP id k14so6382552qtb.0 for ; Fri, 05 Apr 2019 00:42:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to :content-transfer-encoding; bh=KoPHtRdAUnxzvGKDY/6QwhAqymCDY8nPI5pp7xE1pYI=; b=g7au0z0SlMnJz+gw5Gdh5WYmoj3HYdaS5HkamYYpX1IwSAB/T3fzm7dNehM/Bk5phh upTGaU7k00+qd0czClroubCtTzOJPzovui5+aPQiMZwo5EwAq+h2y9lTrYS2poDMsn+9 VPhzBLVXBLvnpjyYAmPplkW2Hi/ywbHvQi1469l2lBvG3YcQ+zbHRDYU20Sqh7d+TkSW 3PfiDMayJaWn+fMojGVHCGfPadCF1YHqj9No/iI5pmSVSG4XIvCaocl6jAGWGVGQbUTc QTXKWNZVyRvu7NlHOMs1AY30Ol2X5s/wg8ugGWjdIsi97nnex2g8I8zIH7Blh7D1vdUk lTsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to :content-transfer-encoding; bh=KoPHtRdAUnxzvGKDY/6QwhAqymCDY8nPI5pp7xE1pYI=; b=WBfUo8I+8enkWsywT4uTAZGXqIK8z4aFdTANz6CCokdc5XAiXE0IGEGEdbyjDHqBeZ XDBye62FprqBp5SpVDQBD3WbGGc3lC/qI+SS0Ur8xMfZHrWWlcZ+9dbCOxhHuTSNcubL xHsr3Q/KlM9PSoK4JPBM2GPNAMUazD3+3PTdqFHkK75EzF+xcBITw/p+IIprhnSgBPRw Rmn8AthH3ZPS9+9rivOA1PLl9OQsmT75C7J0AmtAx2+fhoYxv9dSiOTEq2c4R/oe/QSK PVSSkH7AXmwvWw243I2MCMFqYrhcfVRdAoRaE5s2eAG+wvrVjvH9gOjUFY3CvVzdKDUd B94Q== X-Gm-Message-State: APjAAAV0ZpN6TvB5Q485ulv2zV1uNmPx2grsM5IV6ci3gJkQOr/Ko416 A/lfCXRbiP/KhGc8R/avncMLGhT1q1OBpoRBppZlxvzq X-Google-Smtp-Source: APXvYqwGBJ7TrAWOYnRuuCPkMYpV3OXL1LvOv04BpN1FjQ3hPQ+VXOlfMTmVGFeg6SRQjhsDFZ9qyl3Gxg+NI9Xze7Y= X-Received: by 2002:ac8:2368:: with SMTP id b37mr9636971qtb.50.1554450156325; Fri, 05 Apr 2019 00:42:36 -0700 (PDT) MIME-Version: 1.0 From: Dave Taht Date: Fri, 5 Apr 2019 09:42:24 +0200 Message-ID: To: ECN-Sane , BBR Development , flent-users Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: [Ecn-sane] duplicating the BBRv2 tests at iccrg in flent? X-BeenThere: ecn-sane@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussion of explicit congestion notification's impact on the Internet List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Apr 2019 07:42:37 -0000 I see from the iccrg preso at 7 minutes 55 s in, that there is a test described as: 20 BBRv2 flows starting each 100ms, 1G, 1ms Linux codel with ECN ce_threshold at 242us sojurn time. I interpret this as 20 flows, starting 100ms apart on a 1G link with a 1ms transit time and linux codel with ce_threshold 242us 0) This is iperf? There is no crypto? 1) "sojourn time" not as as setting the codel target to 242us? I tend to mentally tie the concept of sojourn time to the target variable, not ce_threshold 2) In our current SCE work we have repurposed ce_threshold to do sce instead (to save on cpu and also to make it possible to fiddle without making a userspace api change). Should we instead create a separate sce_threshold option to allow for backward compatible usage? 3) Transit time on your typical 1G link is actually 13us for a big packet, why 1ms? is that 1ms from netem? 4) What is the topology here? host -> qdisc -> wire -> host? host -> qdisc -> wire -> router -> host? 5) What was the result with fq_codel instead? --=20 Dave T=C3=A4ht CTO, TekLibre, LLC http://www.teklibre.com Tel: 1-831-205-9740