From owner-freebsd-current Tue Mar 21 11:40:29 2000 Delivered-To: freebsd-current@freebsd.org Received: from uni4nn.gn.iaf.nl (osmium.gn.iaf.nl [193.67.144.12]) by hub.freebsd.org (Postfix) with ESMTP id 01C0337C175; Tue, 21 Mar 2000 11:40:03 -0800 (PST) (envelope-from wilko@yedi.iaf.nl) Received: from yedi.iaf.nl (uucp@localhost) by uni4nn.gn.iaf.nl (8.9.2/8.9.2) with UUCP id UAA05067; Tue, 21 Mar 2000 20:26:05 +0100 (MET) Received: (from wilko@localhost) by yedi.iaf.nl (8.9.3/8.9.3) id TAA01185; Tue, 21 Mar 2000 19:53:24 +0100 (CET) (envelope-from wilko) Date: Tue, 21 Mar 2000 19:53:24 +0100 From: Wilko Bulte To: Matthew Jacob Cc: wilko@freebsd.org, Poul-Henning Kamp , Alfred Perlstein , Matthew Dillon , current@freebsd.org Subject: Re: patches for test / review Message-ID: <20000321195324.D966@yedi.iaf.nl> Reply-To: wilko@freebsd.org References: <20000321000435.A8143@yedi.iaf.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0.1i In-Reply-To: ; from mjacob@feral.com on Mon, Mar 20, 2000 at 11:54:58PM -0800 X-OS: FreeBSD 3.4-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Mon, Mar 20, 2000 at 11:54:58PM -0800, Matthew Jacob wrote: > > > > Hm. But I'd think that even with modern drives a smaller number of bigger > > I/Os is preferable over lots of very small I/Os. > > Not necessarily. It depends upon overhead costs per-i/o. With larger I/Os, you > do pay in interference costs (you can't transfer data for request N because > the 256Kbytes of request M is still in the pipe). OK. 256K might be a bit on the high side. -- Wilko Bulte Arnhem, The Netherlands http://www.tcja.nl The FreeBSD Project: http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message