From owner-cvs-all Tue Mar 27 2:26:37 2001 Delivered-To: cvs-all@freebsd.org Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163]) by hub.freebsd.org (Postfix) with ESMTP id DED8037B71A; Tue, 27 Mar 2001 02:26:32 -0800 (PST) (envelope-from phk@critter.freebsd.dk) Received: from critter (localhost [127.0.0.1]) by critter.freebsd.dk (8.11.3/8.11.3) with ESMTP id f2RAPB375608; Tue, 27 Mar 2001 12:25:11 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) To: Brian Somers Cc: "David E. O'Brien" , cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sbin/newfs newfs.c In-Reply-To: Your message of "Tue, 27 Mar 2001 09:18:32 BST." <200103270818.f2R8IWw48188@hak.lan.Awfulhak.org> Date: Tue, 27 Mar 2001 12:25:11 +0200 Message-ID: <75606.985688711@critter> From: Poul-Henning Kamp Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <200103270818.f2R8IWw48188@hak.lan.Awfulhak.org>, Brian Somers write s: >> Log: >> The common wisdom is to use the largest number of cylinders per group. >> So bump the default from `16' to `22', which is the largest value allowed >> with the current default block size. This change increases the the >> group size from 32MB/g to 44MB/g on a 4GB SCSI disk. > >Does this increase performance ? I have seen it increase performance, and I have seen it make no difference but it has never hurt performance for me. I think tuning UFS/FFS is far more tricky than anticipated because parts of our kernel (clustering for instance) seems to prefer the standard block/frag size. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message