From owner-cvs-all@FreeBSD.ORG Sun Feb 1 15:08:08 2004 Return-Path: Delivered-To: cvs-all@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6D0D116A4CE; Sun, 1 Feb 2004 15:08:08 -0800 (PST) Received: from mail.chesapeake.net (chesapeake.net [208.142.252.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id D002143D75; Sun, 1 Feb 2004 15:07:41 -0800 (PST) (envelope-from jroberson@chesapeake.net) Received: from localhost (jroberson@localhost) by mail.chesapeake.net (8.11.6/8.11.6) with ESMTP id i11N7cw73686; Sun, 1 Feb 2004 18:07:38 -0500 (EST) (envelope-from jroberson@chesapeake.net) Date: Sun, 1 Feb 2004 18:07:38 -0500 (EST) From: Jeff Roberson To: Bruce Evans In-Reply-To: <20040201165625.U7412@gamplex.bde.org> Message-ID: <20040201180709.V36463-100000@mail.chesapeake.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: cvs-src@FreeBSD.org cc: Don Lewis cc: src-committers@FreeBSD.org cc: jeff@FreeBSD.org cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern sched_4bsd.c X-BeenThere: cvs-all@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the entire tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Feb 2004 23:08:08 -0000 On Sun, 1 Feb 2004, Bruce Evans wrote: > On Sat, 31 Jan 2004, Don Lewis wrote: > > > On 31 Jan, Jeff Roberson wrote: > > > jeff 2004/01/31 18:46:47 PST > > > > > > FreeBSD src repository > > > > > > Modified files: > > > sys/kern sched_4bsd.c > > > Log: > > > - Keep a variable 'sched_tdcnt' that is used for the local implementation > > > of sched_load(). This variable tracks the number of running and runnable > > > non ithd threads. This removes the need to traverse the proc table and > > > discover how many threads are runnable. > > Traversing the run queues in sched_load() every 5 seconds might be more > efficient than maintaing the count. It might be cheaper, but it is less scalable. > > > I was suprised to find that processes in disk wait are no longer counted > > towards the load average. This happened in rev 1.163 of kern_synch.c, > > which was committed more than two years ago. > > > > Even if CPU time is available, a machine with a lot of processes stuck > > in disk wait is going to feel slow ... > > They were never counted AFAIK. Isn't this one of the main visible > differences between BSD and Linux? Rev.1.163 ov kern_synch.c just moved > stuff. The change before this in rev.1.59 of vm_meter.c is more likely > to have changed this but was supposed to just remove dead code. > > Bruce >