Date: Mon, 26 Jun 1995 19:47:41 -0400 From: dennis@et.htp.com (dennis) To: freebsd-hackers@freebsd.org Subject: Re: FreeBSD as a router Message-ID: <199506262347.TAA06713@mail.htp.com>
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>: latency is a factor of throughput. Throughput is a timed measurement...more >: latency, less throughput. > >No. That is not the case. If I keep the pipe full, then I can have a >relatively large latency, but still get good throughput. > >For example, I routinely get 2.5K/s from a machine that is two 28.8 kbps >modems from the internet. The interactive latency is high, but I'm >still able to keep the pipe full of data. I also get 2.5K/s one hop >away as well. If what you are saying is true, I should get no better >than 14.4kbps, but I get closer to 28.8kbps. > >If you double latency, you do not decrease the throughput by 1/2, but >you need to double the window size because the "energy" of the pipe is >twice as great as the lower latency case. > You (and many others) are confusing throughput with utilization. Throughput is a performance measurement. Keeping a pipe full because of backlog does not equate to 100% throughput.... db
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