From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-x22a.google.com (mail-it0-x22a.google.com [IPv6:2607:f8b0:4001:c0b::22a]) (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 B4BB03B29E for ; Sun, 1 Jul 2018 17:50:08 -0400 (EDT) Received: by mail-it0-x22a.google.com with SMTP id p4-v6so9635418itf.2 for ; Sun, 01 Jul 2018 14:50:08 -0700 (PDT) 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; bh=gEqa/CQFmtwOr8lI71OY2yFzrVGg35EsRRslO1XYzR0=; b=ITH9S7UUuWni0jqRIEUi8t6ro+yyF8gn/aQQdL6BpX3qHwNojqNjJ+pq6pWT33ae+3 I6lCVTjK7dFaGtX3WEg4yy9nMxARdc2GHPlCbjk8bUDw0wYvrpsPwh6+DanDAHrZ6QTJ YbdIjqIXy87ShsvscZEJI0y/PtpoeLqiic+Y/1NUcRXFqFGgT91HnWuqTJ6042q73unn 50zilgQrnyO6eReTtttMoW609ICkZ/MeaYI6i7QCsbgWOP/q7NhAaC+aGSP+1tv+Ziqt XSw7PkckFlggBOmmww3KQNO7xhxuFhv7Lx/CD0hG2g+Xvn0wO2iZGVeORY8YfvL6pz9g UHzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=gEqa/CQFmtwOr8lI71OY2yFzrVGg35EsRRslO1XYzR0=; b=Yqo7vTERllAdW9uUATHMKND1yA4fPeGbzDlIalSHV7PJZ6cDuHjfmz1iJ/XWPwbDyT f//9QFdxR7/ZNsOtNeb78dVdcm23vnJxwXO2MEoZVPlfa2GO1h3U45FRn3QLNX4iKYN5 CBpEIsgal8qdMaH388NuNRMhsq7tGMmV+Vf0+S+faHHpRBJliv9nAP6XTxd+U6g0q/Ab 6OwYKV7lMiSvZTWgHpfCG2SfVRPNaxAvOgpzCmTv4o7nKlzM3vvCEpCAliK3VkH2NFsV TdnK+RqnZjBvGkpdWW2+ki2LcR1QYxp5SNMXsHPKtNXO6LOxDFgio1rtPvAfbP/xtbPe OswA== X-Gm-Message-State: APt69E2M9nJpc0JXYPiDRcV34zCnTOqsEqWT8hKPLK8EIrJJSHQfBEXn KoB0mEVTXPJlBlCtuI172GLj1XbWf9RENupXbc8= X-Google-Smtp-Source: AAOMgpeFy6WUp+dNT6tXH77CYFjcZzo5PeAZPbNHZ+sEKURP/4rrnQAMweOFmgTWXBKLe+yOVNg9P25IHIRdVspxpG4= X-Received: by 2002:a24:46d4:: with SMTP id j203-v6mr4403126itb.93.1530481808125; Sun, 01 Jul 2018 14:50:08 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: =?UTF-8?Q?Jonas_M=C3=A5rtensson?= Date: Sun, 1 Jul 2018 23:49:56 +0200 Message-ID: To: pete@heistp.net Cc: bloat Content-Type: multipart/alternative; boundary="0000000000008236ad056ff710a4" Subject: Re: [Bloat] powerboost and sqm X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Jul 2018 21:50:08 -0000 --0000000000008236ad056ff710a4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, Jun 30, 2018 at 9:46 AM Pete Heist wrote: > > On Jun 30, 2018, at 8:26 AM, Jonas M=C3=A5rtensson > wrote: > >> >> I played around with flent a bit, here are some example plots: > > https://dl.dropbox.com/s/facariwkp5x5dh1/flent.zip?dl=3D1 > > The short spikes are not seen with flent so I'm led to believe these are > just a result of running the "Hi-Res" dslreports test in a browser. In th= e > flent rrul test, up to about 10 ms induced latency can be seen during the > "powerboost" phase but after that it is almost zero. I'm curious about ho= w > this is implemented on the ISP side. If anything, sqm seems to induce a b= it > more latency during the "steady-state" phase. > > > You may also want to try running flent with --socket-stats and making a > tcp_rtt plot. You should see a significant difference in TCP RTT between > sfq and anything that uses CoDel. > In case anyone is curious I tried this and the tcp rtt plot looks very similar to the ping rtt plot, i.e. the latencies are the same. --0000000000008236ad056ff710a4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Sat= , Jun 30, 2018 at 9:46 AM Pete Heist <pete@heistp.net> wrote:

On Jun 30, 2018, at 8:26 AM, Jonas M=C3=A5rtenss= on <mart= ensson.jonas@gmail.com> wrote:

I played aroun= d with flent a bit, here are some example plots:

<= span style=3D"background-color:rgb(255,255,255);text-decoration-style:initi= al;text-decoration-color:initial;float:none;display:inline">ht= tps://dl.dropbox.com/s/facariwkp5x5dh1/flent.zip?dl=3D1

= The short spikes are not seen with flent so I'm led to believe these ar= e just a result of running the "Hi-Res" dslreports test in a brow= ser. In the flent rrul test, up to about 10 ms induced latency can be seen = during the "powerboost" phase but after that it is almost zero. I= 'm curious about how this is implemented on the ISP side. If anything, = sqm seems to induce a bit more latency during the "steady-state" = phase.

You may al= so want to try running flent with --socket-stats and making a tcp_rtt plot.= You should see a significant difference in TCP RTT between sfq and anythin= g that uses CoDel.

In case anyo= ne is curious I tried this and the tcp rtt plot looks very similar to the p= ing rtt plot, i.e. the latencies are the same.
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