Date: Thu, 24 May 2001 14:14:33 -0400 From: Shannon Hendrix <shannon@widomaker.com> To: Rik van Riel <riel@conectiva.com.br> Cc: "Andresen,Jason R." <jandrese@mitre.org>, Kris Kennaway <kris@obsecurity.org>, Nadav Eiron <nadav@cs.Technion.AC.IL>, hackers@FreeBSD.ORG Subject: Re: technical comparison Message-ID: <20010524141431.A8556@widomaker.com> In-Reply-To: <Pine.LNX.4.33.0105241224331.10469-100000@duckman.distro.conectiva>; from riel@conectiva.com.br on Thu, May 24, 2001 at 12:25:59PM -0300 References: <20010523234910.B19185@widomaker.com> <Pine.LNX.4.33.0105241224331.10469-100000@duckman.distro.conectiva>
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On Thu, May 24, 2001 at 12:25:59PM -0300, Rik van Riel wrote: > On Wed, 23 May 2001, Shannon wrote: > > On Wed, May 23, 2001 at 10:54:40PM -0300, Rik van Riel wrote: > > > > > 1. I don't think I've ever seen a Linux distro which has write > > > caching enabled by default. Hell, DMA33 isn't even enabled > > > by default ;) > > > > You are talking about controlling the IDE drive cache. > > > > The issue here is write cache in the filesystem code. > > 1) IIRC they were talking about hw.ata.wc In a subthread, yeah. I think though, the overall issue is the caching ext2 does that ufs does not. I'm not even sure that soft updates is quite the same thing. I think the soft-updates paper mentions that it shouldn't increase risk, while a lot of people feel like ext2 is very risky. I never really notice a big difference when I turn on write caching with my system (on the hard drive). It's been awhile since I did any benchmarks though, since I no longer run IDE drives on most systems. You can control the cache on them too with the right scsi tools, but I've not really messed with it. -- "There is no such thing as security. Life is either bold | | | adventure, or it is nothing -- Helen Keller" | | | ________________________________________________________________ / | \ s h a n n o n @ w i d o m a k e r . c o m _/ | \_ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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