Date: Thu, 19 Apr 2001 10:47:20 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: "Andrey A. Chernov" <ache@nagual.pp.ru> Cc: 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: <200104191747.f3JHlK156009@earth.backplane.com> 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>
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:> 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
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