From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x233.google.com (mail-qt0-x233.google.com [IPv6:2607:f8b0:400d:c0d::233]) (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 4DC533BA8E for ; Wed, 6 Dec 2017 04:37:05 -0500 (EST) Received: by mail-qt0-x233.google.com with SMTP id r39so7386432qtr.13 for ; Wed, 06 Dec 2017 01:37:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=BurBLBPNmXVhLNQo+8fMgmKrkrRs6jTMszGtz2fNkAQ=; b=Y20wjbgHayN3TJhOML3mr/9NMKHOrZZTEiQ6zEMaENEelJqD6dY0bc+XzV+MJ5c/gM 8q3EOXi1ksj5bAkiCPKd5aY2rdijMgrMD1nSxocdrmzxLD3M37yAxEyyHDblGqQCm9oI DV78ch7xgrXv7gNdPgw1QbT64DSEbmW7nkbC/S3x/1fZC87zmB9YoanrsuQ4VTb7KkxP JttBEIE6Fl+MMCJy3bjF+oBSx5QEi+vyAIubueE1zKP3Snqr0Wm3r7Pkq1fqylbbehdq XFPxFjctkFwGaU4Y8/UCJhNsABFCpgwGp5gUTNnKpNk6X306Lo5N8nL+SHYX2WG+qP22 TREw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=BurBLBPNmXVhLNQo+8fMgmKrkrRs6jTMszGtz2fNkAQ=; b=SYjDvH/f0AU3DBNasQJhrjVqAvk5DpBs1XTSD3Ht6//AQN2dswcNToJNDpF6j71HE0 MMEbNznqaf9/edFKkkTJ9aGISMS5guxcBwvOL/JLpcGs8eBJlEbjQY3gRjimb6tYyH2H IBYaTUB15dLfAAQN/JtUbfiJ6dVwoZHsYLFIs2gmezGqEF6G7WpU2X4TrzanebCOUSKU gtaRX/sTjFdT2Y1vAzabEyzejXi1xhcWdWj0U8iCS6rbZ5QSKjJmIWpWbU+57WdrNLBJ f3derMWBhaY3His0yjyLPgSjeIu1FtgOapaT/nvFlwW7uxSILgFE8U90C0GJ5F07fIVI VJCg== X-Gm-Message-State: AKGB3mKfF2JbUyB7wVlHP7P1Aot/04bPO8Ae9l0loEP7f06omj4sdIRL 7gEicIPOdpUMFPd7fb/w5hR7n/CHdo5HyUnZA7A= X-Google-Smtp-Source: AGs4zMZlw4DSKV2PJpET67T6UeiLWdX+X87z051zlTZnWVKOflGfZmGPZlxWSYCpSFGBwA4A/DthPkq6zDKm6713GRk= X-Received: by 10.200.63.208 with SMTP id v16mr4107086qtk.249.1512553024987; Wed, 06 Dec 2017 01:37:04 -0800 (PST) MIME-Version: 1.0 Received: by 10.140.102.179 with HTTP; Wed, 6 Dec 2017 01:37:04 -0800 (PST) Received: by 10.140.102.179 with HTTP; Wed, 6 Dec 2017 01:37:04 -0800 (PST) In-Reply-To: References: <1512426648.21759.19.camel@gmail.com> <1512436395.8927.10.camel@gmail.com> <1512445837.3088.2.camel@gmail.com> <87vahkdgg0.fsf@nemesis.taht.net> From: Jonathan Morton Date: Wed, 6 Dec 2017 11:37:04 +0200 Message-ID: To: xnor Cc: Cake List Content-Type: multipart/alternative; boundary="94eb2c14988ac22caa055fa8b14b" Subject: Re: [Cake] cake vs fqcodel with 1 client, 4 servers X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Dec 2017 09:37:05 -0000 --94eb2c14988ac22caa055fa8b14b Content-Type: text/plain; charset="UTF-8" At those speeds, you probably still have a large enough BDP per flow that TCP can respond appropriately. I'm testing at 512Kbps, where it's easy to get into single-packet BDPs. A first-pass dynamic target adjustment is now pushed, and running here. It doesn't solve the problem completely, probably because it doesn't guarantee 4xMTU, only 1xMTU, but it looks like it might be beginning to help and I'm pretty sure it's the correct approach. Tuning it from here should be easy. - Jonathan Morton --94eb2c14988ac22caa055fa8b14b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

At those speeds, you probably still have a large enough BDP = per flow that TCP can respond appropriately.=C2=A0 I'm testing at 512Kb= ps, where it's easy to get into single-packet BDPs.

A first-pass dynamic target adjustment is now pushed, and ru= nning here.=C2=A0 It doesn't solve the problem completely, probably bec= ause it doesn't guarantee 4xMTU, only 1xMTU, but it looks like it might= be beginning to help and I'm pretty sure it's the correct approach= .=C2=A0 Tuning it from here should be easy.

- Jonathan Morton

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