From owner-freebsd-stable Sun Feb 17 17:25:22 2002 Delivered-To: freebsd-stable@freebsd.org Received: from rover.village.org (rover.bsdimp.com [204.144.255.66]) by hub.freebsd.org (Postfix) with ESMTP id 1798337B400 for ; Sun, 17 Feb 2002 17:25:20 -0800 (PST) Received: from harmony.village.org (harmony.village.org [10.0.0.6]) by rover.village.org (8.11.3/8.11.3) with ESMTP id g1I1PIi78796; Sun, 17 Feb 2002 18:25:18 -0700 (MST) (envelope-from imp@village.org) Received: from localhost (warner@rover2.village.org [10.0.0.1]) by harmony.village.org (8.11.6/8.11.6) with ESMTP id g1I1PHL60624; Sun, 17 Feb 2002 18:25:18 -0700 (MST) (envelope-from imp@village.org) Date: Sun, 17 Feb 2002 17:25:17 -0800 (PST) Message-Id: <20020217.172517.117915195.imp@village.org> To: paul@gromit.dlib.vt.edu Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Support for DAO in burncd under -STABLE?? From: "M. Warner Losh" In-Reply-To: References: X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In message: Paul Mather writes: : After a little more research, I found that DAO is supported in burncd : under 5.0-CURRENT. However, after briefly installing FreeBSD from the : 5.0-20020214-CURRENT snapshot, I reverted back to 4.5-RELEASE because my : I/O performance under -CURRENT appeared to be about 1/3rd of that under : 4.5-RELEASE (measured by install and dump progress). (Did I pick a bad : snapshot to install??) Likely you had a kernel that had WITNESS enabled. That's a huge performance killer. However, we're at the worst part of the lock pushdown right now, so there's about a 15-20% performance hit (measured by make buildworld, aka the "worldstone"). Things should be getting better from this point forward... Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message