Path: utzoo!attcan!uunet!samsung!usc!snorkelwacker!bloom-beacon!eru!luth!sunic!mcsun!hp4nl!ruuinf!ruunsa!fysaj!muts From: muts@fysaj.fys.ruu.nl (Peter Mutsaers/100000) Newsgroups: comp.protocols.tcp-ip Subject: Why is broadcast so much slower? Message-ID: Date: 15 Jun 90 12:31:23 GMT Sender: news@ruunsa.fys.ruu.nl Distribution: comp Lines: 12 When I do a sendmsg() or sendto() on a datagramsocket, the system CPU-time increases by a factor of ten, on several computers, if I write to a broadcast address instead of to a single address. I did ask permission to broadcast on the socket. Does anyone have an idea why broadcasting is about 10 times as slow, and maybe know a method to broadcast without so much overhead? -- Peter Mutsaers email: muts@fysaj.fys.ruu.nl Rijksuniversiteit Utrecht nmutsaer@ruunsa.fys.ruu.nl Princetonplein 5 tel: (+31)-(0)30-534504 3584 CG Utrecht, Netherlands