88 lines
3.8 KiB
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88 lines
3.8 KiB
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From ilug-admin@linux.ie Wed Oct 9 10:53:59 2002
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id 17yzgl-0001zv-00 for <ilug@linux.ie>; Tue, 08 Oct 2002 12:06:39 -0700
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To: "'ILUG'" <ilug@linux.ie>
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Subject: Re: [ILUG] Modem question
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Message-Id: <20021008190633.GV11235@linuxmafia.com>
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References: <A3C83F41488BD61195C3000802252FC135BCF1@dubim07742.ie.ml.com>
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X-Mas: Bah humbug.
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From: Rick Moen <rick@linuxmafia.com>
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Date: Tue, 8 Oct 2002 12:06:33 -0700
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Quoting Breathnach, Proinnsias (Dublin) (breatpro@exchange.ie.ml.com):
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> Is there any reliable way to calculate your connection speed if you don't
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> trust what the modem reports?
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Do a wget of a file of known length, in a script that runs "date" before
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and after (or equivalent).
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Be aware that speed between you and your upstream link is one thing;
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speed through countless congested routers to a faraway location may be
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quite another. Remember that hardware-level compression is a factor.
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(The file you wget will probably be precompressed.)
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In the area of the slightly more exotic, be aware that different traffic
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may have higher priority and thus more available bandwidth at various
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points in the transit to/from you -- and that some traffic may go via
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different paths coming vs. going.
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Be aware that raw bulk transfer speed may not be the only thing that
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matters: Depending on what you're doing, the modem's connection latency
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might matter, and this differs widely between modems. (It matters more
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for interactive sessions, e.g., ssh remote logins, where each keystroke
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is echoed from remote.)
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--
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Cheers, "Send a policeman, and have it arrested."
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Rick Moen -- Otto von Bismarck, when asked what he
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rick@linuxmafia.com would do if the British Army landed.
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--
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Irish Linux Users' Group: ilug@linux.ie
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http://www.linux.ie/mailman/listinfo/ilug for (un)subscription information.
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List maintainer: listmaster@linux.ie
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