From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by mail.toke.dk (Postfix) with ESMTPS id C82159DEB2B for ; Mon, 16 Jan 2023 17:28:30 +0100 (CET) Authentication-Results: mail.toke.dk; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=e3B951zW Received: by mail-wr1-x433.google.com with SMTP id k8so13504065wrc.9 for ; Mon, 16 Jan 2023 08:28:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=vlHtmkHeLIWp55Vm5ls7Yr939r9kKHYZ98cXRg+lOys=; b=e3B951zWgf1L8s7ZF8eDL3IKggwa7bVb699bZUCE7EdnC9xS8+f62MrfcLeskNIizS sx+zSyHL1Mk0mAl9cOlCySeGB2J61Rk4ZtkiKCZMxMbxTfSMiX9lEpbUawtMgsTq4WcJ Yrs/at5xTUjggqFO9rMgCBD+yiZkAHUTUOtEzGamYxiSYBF25sNTcyqpBeVOo4D0yQ3T oCpHGYGtEI1a+ywt981BZpZeUbxWVGOyfxvUbrGIIK5OA5yEDZlStEjVjjQQXtv2Kr9j EQdUecwIbrCfwlj3zEMiMj3RcUXwEoag3lQJyh3OITggyxjpTFkAwkwYBEPs+wM1JDrd k4SA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=vlHtmkHeLIWp55Vm5ls7Yr939r9kKHYZ98cXRg+lOys=; b=1w8/UoecIxfD1+Vjh4A7c8huK2EO/ZZXJgqGlC+kk1/C8r4TGslL7vuD+dkBB2dPmD MVQa/7RsYu7VJ6clHgO7MZURrsZmE+HfaGaaiNA12bqbgiNs6IvgmGDF/XpllQusuRGy M1DdKhyjMHDMBYPUEhlXv3y5PH0sSQTPAweEVwUC97MNbdBTVnKvdCKIYLyisaakhRzr wLZInsd/oO5QD2wrCpwyjUnikLfeWxfj0MTsWR/kA/W2ga8WIl3UR4YWtE+OIgsvIOml nC3YCYhOyavydLMLDL43cnO5zmMJ2y75s3lyTL1mlhyqVciycuAc/sXrZ8ZKLK4pjpd7 oiqQ== X-Gm-Message-State: AFqh2kq0GWzpN9GOPilppOH5D6nwnnToQleQGnSzzEpdCwMk61MNn1S5 +YJfE/13YLe8+B68CJSnBUtWubRyo6FcIg1Ivic= X-Google-Smtp-Source: AMrXdXs875HwQezKjLnIQImapHmdfKk/Y05G+pd39jYXgdwRyMJGC5LYaLMCL7v73Oh3kKAWeTKoM8jnrE7y9ujt7dA= X-Received: by 2002:a05:6000:1242:b0:242:82f5:fe65 with SMTP id j2-20020a056000124200b0024282f5fe65mr1502wrx.688.1673886509086; Mon, 16 Jan 2023 08:28:29 -0800 (PST) MIME-Version: 1.0 References: <1D4C239D-C890-4FFA-9256-090D964F36C0@gmx.de> In-Reply-To: <1D4C239D-C890-4FFA-9256-090D964F36C0@gmx.de> From: Dave Taht Date: Mon, 16 Jan 2023 08:28:17 -0800 Message-ID: To: Sebastian Moeller Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Message-ID-Hash: UIW6DSVBRKZCBAUDOI7GZZCMOKGHSXSB X-Message-ID-Hash: UIW6DSVBRKZCBAUDOI7GZZCMOKGHSXSB X-MailFrom: dave.taht@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: flent-users X-Mailman-Version: 3.3.7 Precedence: list Subject: [Flent-users] Re: flaws and features of flent List-Id: Flent discussion list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Sun, Jan 15, 2023 at 11:14 PM Sebastian Moeller wrote: > > Hi Dave, > > On 16 January 2023 02:52:45 CET, Dave Taht wrote: > >A rather long, meandering piece: > > > >https://blog.cerowrt.org/post/flaws_in_flent/ > > I think 'Flent=E2=80=99s default sampling rate is too low' has a conceptu= ally simple solution, record dats at high sample rates and optionally downs= ample before plotting... However with the range of network speeds flent cov= ers picking a sane default is going to be a challenge. With almost all endh= osts sporting gigabit ethernet interfaces and beyond I am unsure whether ba= sing the sample rate on to-be-detected interface rate would help (it might = serve to give an upper bound for sampling rate). The real problem is we run out of cpu when polling ss too fast. I haven't played with google labs' sampler as yet, it's here: A righter answer, long term, is to start wedging a lag meter, and sampling TCP_INFO, directly into more utilities and libraries. Adding a lag meter to git, for example, would get some eyeballs on bufferbloat quickly. Something that worked within a web browser, passively, would be good also. Getting TCP_INFO sampling into rust and go has been on my mind. https://github.com/rust-lang/socket2/issues/362 And thank you for reading. I am loving having emacs in front of me again. I hope to move more of my workload back into that, including email, and to add a grammar checker, in the hope that more of what I write in the future is more accessible. Assuming I can keep pounding out text at this rate, and continue to improve my workflow, the bufferbloat.net site will improve rapidly. > > regards > Sebastian > > > > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. --=20 This song goes out to all the folk that thought Stadia would work: https://www.linkedin.com/posts/dtaht_the-mushroom-song-activity-69813666656= 07352320-FXtz Dave T=C3=A4ht CEO, TekLibre, LLC