From owner-freebsd-arch Fri Dec 7 5:34:20 2001 Delivered-To: freebsd-arch@freebsd.org Received: from axl.seasidesoftware.co.za (axl.seasidesoftware.co.za [196.31.7.201]) by hub.freebsd.org (Postfix) with ESMTP id 484E637B416 for ; Fri, 7 Dec 2001 05:34:16 -0800 (PST) Received: from sheldonh (helo=axl.seasidesoftware.co.za) by axl.seasidesoftware.co.za with local-esmtp (Exim 3.33 #1) id 16CLA6-0008H2-00; Fri, 07 Dec 2001 15:35:34 +0200 From: Sheldon Hearn To: Matthew Dillon Cc: Kirk McKusick , freebsd-arch@FreeBSD.ORG Subject: Re: Using a larger block size on large filesystems In-reply-to: Your message of "Sat, 24 Nov 2001 10:45:22 PST." <200111241845.fAOIjM377587@apollo.backplane.com> Date: Fri, 07 Dec 2001 15:35:34 +0200 Message-ID: <31807.1007732134@axl.seasidesoftware.co.za> Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, 24 Nov 2001 10:45:22 PST, Matthew Dillon wrote: > Sheldon, I think you have a go to change the newfs default. Do it! Hi Matt, I already have patches for newfs, sysinstall and the tuning(7) manual page which simply make 16384/2048 the default. However, I remember people expressing concerns with using these parameters for very small filesystems. I can't find any negative performance impact for very small filesystems. The only other thing I can think of is what obrien suggested. He told me that it might be that people are wary of a filesystem that contains only a single cylinder group, as this means you only have one superblock. Is this really something to worry about? Is there some other reason why we shouldn't just make 16384/2048 the blanket default? Ciao, Sheldon. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message