From owner-freebsd-current Thu Apr 19 15:26:24 2001 Delivered-To: freebsd-current@freebsd.org Received: from mailman.zeta.org.au (mailman.zeta.org.au [203.26.10.16]) by hub.freebsd.org (Postfix) with ESMTP id 2F7F337B43E; Thu, 19 Apr 2001 15:26:21 -0700 (PDT) (envelope-from bde@zeta.org.au) Received: from bde.zeta.org.au (bde.zeta.org.au [203.2.228.102]) by mailman.zeta.org.au (8.9.3/8.8.7) with ESMTP id IAA02608; Fri, 20 Apr 2001 08:26:01 +1000 Date: Fri, 20 Apr 2001 08:23:20 +1000 (EST) From: Bruce Evans X-Sender: bde@besplex.bde.org To: "Andrey A. Chernov" Cc: Matt Dillon , Maxim Sobolev , Doug Barton , "Alfred Perlstein 'current@freebsd.org'" Subject: Re: FW: Filesystem gets a huge performance boost In-Reply-To: <20010419214230.A69239@nagual.pp.ru> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, 19 Apr 2001, Andrey A. Chernov wrote: > On Thu, Apr 19, 2001 at 10:39:58 -0700, Matt Dillon wrote: > > Let me explain a little more. If it's commented out, it's fine. But > > if you are actually setting a value in there you will override whatever > > is set in the kernel. When people install new systems they do not > > usually override their /etc/ files, so an uncommented value will > > set that default in stone and prevent us from being able to change > > it with a new kernel rev. This being a *kernel* specific feature, > > we need to have control over the default in the kernel itself. > > What about simple check in the kernel: if total memory is above 64Mb, then > enable this mode by default, else disable it. I believe it should be enabled at more like 640MB than 64MB. It slows down makeworld (immediately after rebooting to get a consistent enviroment) a little here with 256MB. Whether it is good depends more on the application mix than the memory size. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message