From owner-freebsd-isp Wed Sep 4 12:31:24 1996 Return-Path: owner-isp Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id MAA28320 for isp-outgoing; Wed, 4 Sep 1996 12:31:24 -0700 (PDT) Received: from brasil.moneng.mei.com (brasil.moneng.mei.com [151.186.109.160]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id MAA28315 for ; Wed, 4 Sep 1996 12:31:21 -0700 (PDT) Received: (from jgreco@localhost) by brasil.moneng.mei.com (8.7.Beta.1/8.7.Beta.1) id OAA13725; Wed, 4 Sep 1996 14:29:42 -0500 From: Joe Greco Message-Id: <199609041929.OAA13725@brasil.moneng.mei.com> Subject: Re: Anyone using ccd (FreeBSD disk striper) for news To: winter@jurai.net (Matthew N. Dodd) Date: Wed, 4 Sep 1996 14:29:42 -0500 (CDT) Cc: jgreco@brasil.moneng.mei.com, alk@think.com, freebsd-isp@FreeBSD.org In-Reply-To: from "Matthew N. Dodd" at Aug 29, 96 05:44:58 pm X-Mailer: ELM [version 2.4 PL24] Content-Type: text Sender: owner-isp@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk > On Mon, 26 Aug 1996, Joe Greco wrote: > > Sometimes you do not CARE when someone last read a file. It costs lots and > > lots of disk bandwidth to write that information back on a busy news server > > where thousands of files are accessed during every 30 second interval. > > > > If you do not have to write that information, you now have more disk > > bandwidth with which to READ more data, which is what you really wanna > > do. > > Clayton O'Neill fixed Linux to not update ATIMEs for use on his newsserver > and he did get some noticeable performance improvements. Yes, I saw his message a week or two after I butchered it into FreeBSD .. the comment was :This is an implementation of an idea that I believe was originally :mentioned on the FreeBSD hackers mailing list. so I am suspecting that my work was the incentive for them to do this :-) This is potentially a _great win_ for a reader machine with several hundred active nnrp clients. This is not (much of) a win for a feeds system. > Nowhere near the > improvements he got when he went RAID via DPT, but still, it was worth it. I want a DPT driver for FreeBSD... if I had money, I would PAY someone to do it... but I don't have money. :-( > I think he even had a mount time flag that would allow per fs ATIME > updates. (ie: mount -o noatime) Yes, I did this too. > I've not really looked at doing this yet but it didn't look very straight > forward. It's icky, at least the way I did it. DG had also worked on this and I'd really really like to see his work.... ... JG