From owner-freebsd-current Wed Jul 8 20:43:31 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA17016 for freebsd-current-outgoing; Wed, 8 Jul 1998 20:43:31 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id UAA17010 for ; Wed, 8 Jul 1998 20:43:26 -0700 (PDT) (envelope-from imp@village.org) Received: from harmony [10.0.0.6] by rover.village.org with esmtp (Exim 1.71 #1) id 0yu7c6-0001SH-00; Wed, 8 Jul 1998 21:43:18 -0600 Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.8.8/8.8.3) with ESMTP id VAA11270; Wed, 8 Jul 1998 21:45:09 -0600 (MDT) Message-Id: <199807090345.VAA11270@harmony.village.org> To: Stephen Hocking-Senior Programmer PGS Tensor Perth Subject: Re: Rate limit for system calls to prevent denial of service attacks? Cc: "Daniel O'Connor" , current@FreeBSD.ORG In-reply-to: Your message of "Thu, 09 Jul 1998 09:46:38 +0800." <199807090146.JAA15831@ariadne.tensor.pgs.com> References: <199807090146.JAA15831@ariadne.tensor.pgs.com> Date: Wed, 08 Jul 1998 21:45:09 -0600 From: Warner Losh Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <199807090146.JAA15831@ariadne.tensor.pgs.com> Stephen Hocking-Senior Programmer PGS Tensor Perth writes: : Why does this whole discussion remind me of Softway's Fair SHare : Scheduler, which was developed for a student environment? Basically, : if the machine's under load, it allows you to limit the CPU used by : a given group to X%. It was the subject of a couple of Usenix papers : in the 80s as I recall. Sheesh, I'm sure BDE's heard of it, being a : part of the Sydney Unix Mafia. Related to this is the Lottery Scheduler that some folks have running on a K6-200 box running FreeBSD. Here's the URL that a friend sent me: >>http://www.research.digital.com/SRC/personal/caw/papers.html >> >>Carl A. Waldspurger and William E. Weihl. Lottery Scheduling: Flexible >>Proportional-Share Resource Mangement, Proceedings of the First >>Symposium on Operating Systems Design and Implementation (OSDI '94), >>pages 1-11, Monterey, California, November 1994. Received award for >>best paper. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message