From owner-freebsd-hackers Thu Jan 31 11:22:57 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mail.webjockey.net (mail.webjockey.net [208.141.46.3]) by hub.freebsd.org (Postfix) with ESMTP id A5E5937B405 for ; Thu, 31 Jan 2002 11:22:50 -0800 (PST) Received: from outloud.org (IDENT:nobody@home.webjockey.net [208.141.46.11]) (authenticated) by mail.webjockey.net (8.11.6/8.11.6) with ESMTP id g0VJMXx39216; Thu, 31 Jan 2002 14:22:33 -0500 (EST) (envelope-from gary@outloud.org) Received: from 208.141.46.249 (proxying for 63.68.129.181) (SquirrelMail authenticated user ancient) by test.outloud.org with HTTP; Thu, 31 Jan 2002 14:22:47 -0500 (EST) Message-ID: <2651.208.141.46.249.1012504967.squirrel@test.outloud.org> Date: Thu, 31 Jan 2002 14:22:47 -0500 (EST) Subject: Re: Clock Granularity (kernel option HZ) From: "Storms of Perfection" To: X-XheaderVersion: 1.1 X-UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; Q312461) In-Reply-To: References: X-Priority: 3 Importance: Normal X-MSMail-Priority: Normal Cc: X-Mailer: SquirrelMail (version 1.2.5 [cvs]) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG I am intrested in this as well. > Hello! > > I've seen various postings on the Net where people reported > network-related and overall performance improvements caused > by settig HZ kernel option to 1000 (for example), that is, > reducing a tick size to 1ms for their FreeBSD and Linux > systems. However, several problems seem to arise, such as > some device drivers do not include HZ in calculating their > timeout value, but simply assume HZ to be 100, and also some > utility programs such as top or ps take timing information > from the kernel in ticks, also assuming 10ms ticks, however, > most of these saying were related to Linux. How safe it is > to bump up HZ to, say, 1000 in FreeBSD (I use 4.5-STABLE)? > What pitfals will I encounter (drivers, top/ps)? Is there > are going to be [promised] performance increase? Do I > really need it? Thank you. > ____________________________________________________________ > Сделайте себе подарок - http://ngs.ru/tovar > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message Gary Stanley Network Security Engineer PRECISIONet/Webjockey, Inc. (877) 595-8570 Tickle us, do we not laugh? Prick us, do we not bleed? Wrong us, shall we not revenge?" (Merchant of Venice II i 56-63, paraphrase) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message