Xref: utzoo comp.dcom.modems:2513 comp.mail.uucp:1943 Newsgroups: comp.dcom.modems,comp.mail.uucp Path: utzoo!henry From: henry@utzoo.uucp (Henry Spencer) Subject: Re: UUCP g stats Message-ID: <1988Sep25.015301.768@utzoo.uucp> Organization: U of Toronto Zoology References: <183@arnold.UUCP> <1988Sep20.184054.2403@utzoo.uucp> <184@arnold.UUCP> Date: Sun, 25 Sep 88 01:53:01 GMT In article <184@arnold.UUCP> dave@arnold.UUCP (Dave Arnold) writes: >> ... Uucp-g can run a line at circa 90% >> of line speed quite consistently if the machines are fast enough and >> the serial interfaces are not so stupid as to be a bottleneck... > >...I have never seen 90% bandwidth utilization. My 3B1 at home running >at 1200 baud always gets around 100-120 cps. How are you computing >bandwidth utilization? ... (c * 8) / b ? You're forgetting the start and stop bits. It's 10 bits per character, not 8. 90% of 1200 baud is 108 cps. Back when most of our news traffic was at 1200, we saw uucp running at 109 +- 2 or so cps for hours on end, quite consistently, for most sites. At 2400 the loading on the machines starts to matter a bit more, so the variation increased, but the numbers were still pretty consistent. At higher speeds, system loading and various kinds of hardware brain-damage matter a lot more, the rates vary all over the place, and 90% becomes the "guaranteed not to exceed" utilization rather than the average. -- NASA is into artificial | Henry Spencer at U of Toronto Zoology stupidity. - Jerry Pournelle | uunet!attcan!utzoo!henry henry@zoo.toronto.edu