From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-x12b.google.com (mail-lf1-x12b.google.com [IPv6:2a00:1450:4864:20::12b]) (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 13FDA3B29E for ; Wed, 3 Jun 2020 18:30:04 -0400 (EDT) Received: by mail-lf1-x12b.google.com with SMTP id x22so2350325lfd.4 for ; Wed, 03 Jun 2020 15:30:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=Gqs1rfQIEcASultX9fjnOa7OQkLBuQT2kRpj9c/rF9Q=; b=BpsJXKfRghk0xwgX/NqsWvnrhOsY2mbF6XdK+z3JFOS04rF27EACPZj1uIhCmvQCsM fAe/K9ehgkzXjWiKuuQZBNd1cEJTA0I0rBY06ya1EVDbYk71yzwQdXiPL9I/s8qv+/sR 5JQNHTM5BbpAXg2fZFni3KEImZ22RfTz4/X2dQavMPDavQTH0Po/rrT/dCY8lbSB5HKU EuOCzY3+pfFC4e75YhCIb4UYF5mtTYNATY44MSuaGBQyyQipcXB+T7m8ZNNULJk4R63g XsEdZNdJzqElmN+0+gIG5ubyCoz64diAAsUePpO5q2Ql+4QrD6P4zXatQg1s0xWzeyum sOXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=Gqs1rfQIEcASultX9fjnOa7OQkLBuQT2kRpj9c/rF9Q=; b=a8Czn5/OnLUevkXAEAec7ZvbvCBZ6eh3ThOWG1KXaHSaA7RbX7ESAkgJyg2Ft3/yxg +WtSQoGtsXeA+9w/KUyKzoXJlFBb3hiTOF9iAwo7jWc/G6+5/mOKkb7t8qHUFUkSS+62 LE97+5vt+YK22IWURW/MQW/jae8HcwOD0uoDl9lfJhIFawRRl0HEnzXJhYOSMM1mhanL FhsayCHcBM/670qfXFwHe2rvUPYRgh6Y19CRpCBHfrJza5YoYQiP0OL5rWDqZT/h3RGJ J9TFPdC5+3mqHpaIi1n+1i3XjFt8YH1gCCiAEDGB+IX6XRHp/zHvyWfhGlNEjQ9Uilu9 BQJw== X-Gm-Message-State: AOAM533+SXOCNVUJyNvaGDeC66HPLP38w/dGAAqj7V1QutgAmBae7w1i nx9tA/S2YKd5lIzzvbC5nq0= X-Google-Smtp-Source: ABdhPJyMS7g93ZjWgWy3x3BnXP8guTRHy7Zhgs8D/gM6mcaKouT4GClxm1o/pi7Wea+sqgxrKLehXg== X-Received: by 2002:a19:550e:: with SMTP id n14mr846252lfe.81.1591223402978; Wed, 03 Jun 2020 15:30:02 -0700 (PDT) Received: from jonathartonsmbp.lan (83-245-237-14-nat-p.elisa-mobile.fi. [83.245.237.14]) by smtp.gmail.com with ESMTPSA id y17sm1004703lfa.77.2020.06.03.15.30.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Jun 2020 15:30:02 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.5\)) From: Jonathan Morton In-Reply-To: Date: Thu, 4 Jun 2020 01:30:01 +0300 Cc: bloat Content-Transfer-Encoding: quoted-printable Message-Id: References: To: dave.collier-brown@indexexchange.com X-Mailer: Apple Mail (2.3445.9.5) Subject: Re: [Bloat] What's a good non-intrusive way to look at bloat (and perhaps things like gout (:-)) 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: Wed, 03 Jun 2020 22:30:04 -0000 > On 4 Jun, 2020, at 1:21 am, Dave Collier-Brown = wrote: >=20 > We've good tools to measure network performance under stress, by the = simple expedient of stressing it, but is there a good approach I could = recommend to my company to monitor a bunch of reasonably modern links, = without the measurement significantly affecting their state? >=20 > I don't mind increasing bandwidth usage, but I'm downright grumpy = about adding to the service time: I have a transaction that times out = for gross slowness if it takes much more that an tenth of a second, and = it involves a scatter-gather interaction with at least 10 customers in = that time. >=20 > I'm topically interested in bloat, but really we should understand = "everything" about our links. If they can get the bloats like cattle, = they can probably get the gout, like King Henry the Eighth (;-)) >=20 > My platform is Centos 8, and I have lots of Smarter Colleagues to = help. My first advice would be to browse pollere.net for tools - like pping = (passive ping), which monitors the latency of flows in transit. That = should give you some interesting information without adding any load at = all. There is also connmon (https://github.com/pollere/connmon). - Jonathan Morton=