From owner-freebsd-stable Sat Jul 13 0:19:58 2002 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 253EB37B400 for ; Sat, 13 Jul 2002 00:19:55 -0700 (PDT) Received: from apollo.backplane.com (apollo.backplane.com [216.240.41.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id C8E3943E4A for ; Sat, 13 Jul 2002 00:19:54 -0700 (PDT) (envelope-from dillon@apollo.backplane.com) Received: from apollo.backplane.com (localhost [127.0.0.1]) by apollo.backplane.com (8.12.5/8.12.4) with ESMTP id g6D7JsLA076880; Sat, 13 Jul 2002 00:19:54 -0700 (PDT) (envelope-from dillon@apollo.backplane.com) Received: (from dillon@localhost) by apollo.backplane.com (8.12.5/8.12.4/Submit) id g6D7JsDS076879; Sat, 13 Jul 2002 00:19:54 -0700 (PDT) (envelope-from dillon) Date: Sat, 13 Jul 2002 00:19:54 -0700 (PDT) From: Matthew Dillon Message-Id: <200207130719.g6D7JsDS076879@apollo.backplane.com> To: hawkeyd@visi.com (D J Hawkey Jr) Cc: freebsd-stable@freebsd.org Subject: Re: tuning(7) request was: Re: Performance boost with kernel options in FBSD 4.6 References: <04a601c228dc$c6dbb980$681663cf_icarz.com@ns.sol.net> <200207111930.g6BJUX5m096974_apollo.backplane.com@ns.sol.net> <200207120344.g6C3iDS63523@sheol.localdomain> Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG :In your estimation, would it affect the case of several chained pipes, :[doing|waiting on] disk I/O? Or, say, a complex SQL query? : :Sorry for my naivete, but would increasing the HZ have the effect of making :the rest of my activities "snappier" in the above situation? Or is this :still too vague? : :The machines are 700Mhz Celerons and "better", mostly IDE, BTW. : :Thanks, :Dave Anything that blocks on lots of little I/O's, which a complex SQL query will do, can monopolize the system's resources. But if the data is well cached a complex sql query will simply be cpu bound and the scheduler will take care of it. In anycase, you just have to play with HZ to find out whether it has any effect. -Matt Matthew Dillon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message