From owner-freebsd-current Thu Apr 19 10:47:27 2001 Delivered-To: freebsd-current@freebsd.org Received: from earth.backplane.com (earth-nat-cw.backplane.com [208.161.114.67]) by hub.freebsd.org (Postfix) with ESMTP id B3BDF37B424; Thu, 19 Apr 2001 10:47:25 -0700 (PDT) (envelope-from dillon@earth.backplane.com) Received: (from dillon@localhost) by earth.backplane.com (8.11.2/8.11.2) id f3JHlK156009; Thu, 19 Apr 2001 10:47:20 -0700 (PDT) (envelope-from dillon) Date: Thu, 19 Apr 2001 10:47:20 -0700 (PDT) From: Matt Dillon Message-Id: <200104191747.f3JHlK156009@earth.backplane.com> To: "Andrey A. Chernov" Cc: Maxim Sobolev , Doug Barton , "Alfred Perlstein 'current@freebsd.org'" Subject: Re: FW: Filesystem gets a huge performance boost References: <200104161634.f3GGYZs11356@aslan.scsiguy.com> <200104162146.f3GLkGT82369@earth.backplane.com> <3ADBF9FA.9D1C4DB4@DougBarton.net> <20010417011335.V976@fw.wintelcom.net> <3ADC0221.32127C39@DougBarton.net> <3ADEDE2F.573C20A1@FreeBSD.org> <200104191632.f3JGWVG54689@earth.backplane.com> <3ADF1F36.44A3AA54@FreeBSD.org> <200104191739.f3JHdw255890@earth.backplane.com> <20010419214230.A69239@nagual.pp.ru> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG :> 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. : :-- :Andrey A. Chernov You are assuming that turning on vmiodirenable is detrimental on a low-memory machine. I don't think it is, because on a low memory machine you aren't going to be able to cache very much anyway. But if anyone thinks it is please be my guest and test it on a low-memory machine on verses off. -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message