From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-x234.google.com (mail-it0-x234.google.com [IPv6:2607:f8b0:4001:c0b::234]) (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 BD0DB3BA8E for ; Sat, 30 Jun 2018 02:26:37 -0400 (EDT) Received: by mail-it0-x234.google.com with SMTP id p4-v6so5767972itf.2 for ; Fri, 29 Jun 2018 23:26:37 -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=wmAiRBWQGD0rYMOslNhqERpCbS545NAMyoLSaexkbnE=; b=YLGS9m8ex+b4kHy6FvCGWWuum7buE8ZU/ULV5jNhH3MOC/BQDYBgNfv5r7nGLq0ZMO M3CXonxpE0CdC+LTaoKP5hLPKwC1hTdei4sgOxLlPz9beGJIAExu2JG5NkNVQtAnDFFi QSthUh+RxOINyvBAUCQfVBKIjDT26yEZWbCgYT5K5G5oKsj8LJCUlg4Nsm8aDi0MwMze 6jtwkk1ZVyIMR9OMzPYJWHI+8kByJwtPkDXbVCXjjg7bZsoCU1mn5Rq7BO7YpbFoPkcw cBMOrYObOba0yUwdJc+o5KZc/31BUEgKfXSQL/Y0ADicncP03B8yFsprxrQqBgfdm208 AU8A== 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=wmAiRBWQGD0rYMOslNhqERpCbS545NAMyoLSaexkbnE=; b=FFL4oyQ3YizyYOmiYelXNVSscBeLeQHme7/vtzwPTyBnvVwgW8Skz5gnu9W8HcHZ1g VUQPc1M54KB06KUfyXKBFHKXtqvD7YulNTwvySX+wxrpEEz7NY0QnWTFgg7LgQxFgWVe UyMMKYrT7nAcSjAp9H1GcQSbNYq34vkysVSOhDq3HHT1XLSlIAhU0sp6ee+e6LwMvd98 g27U+n9tEt/kaaAfQ88bMJEHbCfbGPCLgp3gEfnS4zR9WaDEPVXXG39DPaPCCJlbCsGR reMP8omv4zjvxKjuoaGktkrXCnVtbF+q54Bf+fArvar8Ht8gKN0bBM1z3F2A6wFLy4S/ CwLw== X-Gm-Message-State: APt69E1Ot6pxn+lzTEYNRSnPKfg+fR/43Da7/knp+Uvi6N8LMBytXNIh r8LVl9koyG76b9b3pulAjWSvSmSpxMDsCrOL35Y= X-Google-Smtp-Source: AAOMgpewG4q6Sn3MLlXD8XVU13ujr5K2Or9MAGHH+/I2fwaIXGz+LypVv3Q6swCtojj6Sv2P+dZz1zhqf1+pngN4fOo= X-Received: by 2002:a24:4e8f:: with SMTP id r137-v6mr175614ita.9.1530339997230; Fri, 29 Jun 2018 23:26:37 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: =?UTF-8?Q?Jonas_M=C3=A5rtensson?= Date: Sat, 30 Jun 2018 08:26:25 +0200 Message-ID: To: Sebastian Moeller Cc: bloat Content-Type: multipart/alternative; boundary="000000000000ebb702056fd60b2c" 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: Sat, 30 Jun 2018 06:26:37 -0000 --000000000000ebb702056fd60b2c Content-Type: text/plain; charset="UTF-8" > > > - Are the latency spikes real? > > I believe so, but I would try to use flent's rrul test to see > whether theses also show up outside of a browser-based test. > I played around with flent a bit, here are some example plots: https://dl.dropbox.com/s/facariwkp5x5dh1/flent.zip?dl=1 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 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. /Jonas --000000000000ebb702056fd60b2c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
> - Are the latency spikes real?

=C2=A0 =C2=A0 =C2=A0 =C2=A0 I believe so, but I would try to use flent'= s rrul test to see whether theses also show up outside of a browser-based t= est.

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">https://dl.dropbox.c= om/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 o= f running the "Hi-Res" dslreports test in a browser. 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 ab= out how this is implemented on the ISP side. If anything, sqm seems to indu= ce a bit more latency during the "steady-state" phase.

/Jonas
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