From owner-freebsd-current Thu Oct 17 19:27:42 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id TAA17862 for current-outgoing; Thu, 17 Oct 1996 19:27:42 -0700 (PDT) Received: from mx.serv.net (mx.serv.net [199.201.191.10]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id TAA17857 for ; Thu, 17 Oct 1996 19:27:27 -0700 (PDT) Received: from MindBender.serv.net by mx.serv.net (8.7.5/SERV Revision: 2.30) id TAA25629; Thu, 17 Oct 1996 19:27:24 -0700 (PDT) Received: from localhost.HeadCandy.com (michaelv@localhost.HeadCandy.com [127.0.0.1]) by MindBender.serv.net (8.7.5/8.7.3) with SMTP id TAA14184; Thu, 17 Oct 1996 19:27:09 -0700 (PDT) Message-Id: <199610180227.TAA14184@MindBender.serv.net> X-Authentication-Warning: MindBender.serv.net: Host michaelv@localhost.HeadCandy.com [127.0.0.1] didn't use HELO protocol To: "Marc G. Fournier" cc: Michael Hancock , Jaye Mathisen , current@freebsd.org Subject: Re: Iozone: local vs nfs drives In-reply-to: Your message of Thu, 17 Oct 96 17:00:06 -0400. Date: Thu, 17 Oct 1996 19:27:09 -0700 From: "Michael L. VanLoon -- HeadCandy.com" Sender: owner-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk >> Did you have tagged-command queuing enabled? According to my tests, >> that will make a BIG difference, if you have decent drives. > I don't know...I haven't enabled it manually, so I would assume >not. > How do I check/enable it? Any caveats I should worry about? Put "options AHC_TAGENABLE" in your kernel config file, and rebuild (this is on NetBSD, anyway, but it's the common code written by Justin Gibbs). Caveats? My NetBSD box has been running a ccd for about two months striped across two drives, with this enabled (and the drives do support tagged command queuing, yes). This is on NetBSD-current (1.2), using the "common" AHC driver. No bad things have happened, yet. :-) ----------------------------------------------------------------------------- Michael L. VanLoon michaelv@MindBender.serv.net --< Free your mind and your machine -- NetBSD free un*x >-- NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3, Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32... NetBSD ports in progress: PICA, others... -----------------------------------------------------------------------------