Date: Wed, 4 Sep 1996 14:29:42 -0500 (CDT) From: Joe Greco <jgreco@brasil.moneng.mei.com> To: winter@jurai.net (Matthew N. Dodd) Cc: jgreco@brasil.moneng.mei.com, alk@think.com, freebsd-isp@FreeBSD.org Subject: Re: Anyone using ccd (FreeBSD disk striper) for news Message-ID: <199609041929.OAA13725@brasil.moneng.mei.com> In-Reply-To: <Pine.BSI.3.95.960829174019.929N-100000@sasami.jurai.net> from "Matthew N. Dodd" at Aug 29, 96 05:44:58 pm
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> 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
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