From owner-freebsd-fs Sun Apr 2 4:43:18 2000 Delivered-To: freebsd-fs@freebsd.org Received: from lanturn.express.ru (lanturn.kmost.express.ru [212.24.37.109]) by hub.freebsd.org (Postfix) with ESMTP id C3B2D37BABF for ; Sun, 2 Apr 2000 04:43:02 -0700 (PDT) (envelope-from vova@express.ru) Received: from vova (helo=localhost) by lanturn.express.ru with local-esmtp (Exim 3.11 #1) id 12bihm-0006SB-00; Sun, 02 Apr 2000 15:38:10 +0400 Date: Sun, 2 Apr 2000 15:38:10 +0400 (MSD) From: vova@express.ru X-Sender: vova@lanturn.kmost.express.ru To: Bernd Walter Cc: freebsd-fs@FreeBSD.ORG Subject: Re: SCSI bus In-Reply-To: <20000402110216.A24876@cicely8.cicely.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Sun, 2 Apr 2000, Bernd Walter wrote: > > > I don't expect this to work because the readonly side can't know when the > > > incore informations outdates. > > > > Yes, it can be a problem, but may be this may be solved by disabling any > > cache on read-only side (or setting expire time in one sec) ? > > You can't diable readcaching completely. > Say you need the inode, then you will read it and finaly use it. > You don't reread it for every single byte you access which creates some kind of > read cache. And there are much more complex points like this sample. Ok, have kernel algorithm to "expire" cached vnodes ? Or vnodes only pushed out by new pages ? In my case writes - relative rare case then reads and I can wait for some timeout while my in-kernel vnodes will dropped to see new from disk > -- > B.Walter COSMO-Project http://www.cosmo-project.de > ticso@cicely.de Usergroup info@cosmo-project.de -- TSB Russian Express, Moscow Vladimir B. Grebenschikov, vova@express.ru To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message