Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site cvl.UUCP Path: utzoo!linus!decvax!ittvax!dcdwest!sdcsvax!sdcrdcf!hplabs!hao!seismo!rlgvax!cvl!louie From: louie@cvl.UUCP Newsgroups: net.unix-wizards Subject: Re: "slewing" the system clock Message-ID: <1170@cvl.UUCP> Date: Fri, 13-Jul-84 17:17:02 EDT Article-I.D.: cvl.1170 Posted: Fri Jul 13 17:17:02 1984 Date-Received: Mon, 16-Jul-84 05:01:12 EDT References: <1528@sri-arpa.UUCP> Organization: U. of Md. Computer Vision Lab Lines: 21 I don't know of a UN*X that does this, but the fuzzball software for PDP11 systems (a RT11 emulator with extensive TCP/IP network development and debugging tools) does this. Co-operating fuzzball systems exchange "hello" message packets with each other, which among other things, provide time synchonization. Dave Mills, the author of the fuzzball software, could tell you all about it. I believe that there is an ARPANET RFC around somewhere that describes the algorithms invovled. The general idea is that if the host is within a couple of minutes of the correct time, there is a slewing of the clock, but when the host first comes up, the clock is immediately reset. We've got a zoo of about 5 of fuzzballs and other systems that do this, and its nice not to have to worry about setting the time of your system everytime you boot it. Dave Mills' arpanet address is if you'd like to contact him. If you don't have arpanet access, I can forward a message to him manually. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Louis A. Mamakos - Computer Science Center (Systems Staff) - Univ. of Maryland Internet: louie@cvl.ARPA uucp: ...!{seismo,ihnp4,allegra}!rlgvax!cvl!louie