Date: Fri, 20 Apr 2001 08:23:20 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: "Andrey A. Chernov" <ache@nagual.pp.ru> Cc: Matt Dillon <dillon@earth.backplane.com>, Maxim Sobolev <sobomax@FreeBSD.ORG>, Doug Barton <DougB@DougBarton.net>, "Alfred Perlstein <bright@wintelcom.net> 'current@freebsd.org'" <current@FreeBSD.ORG> Subject: Re: FW: Filesystem gets a huge performance boost Message-ID: <Pine.BSF.4.21.0104200817270.13188-100000@besplex.bde.org> In-Reply-To: <20010419214230.A69239@nagual.pp.ru>
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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
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