Date: Sun, 12 Aug 2001 03:37:05 -0500 From: Alfred Perlstein <bright@mu.org> To: Greg Lehey <grog@FreeBSD.org> Cc: Kevin Hui <khui@cs.toronto.edu>, freebsd-questions@freebsd.org Subject: Re: Experiencing very slow raw write speeds on /dev/ad1 Message-ID: <20010812033705.V85642@elvis.mu.org> In-Reply-To: <20010812180014.D48115@wantadilla.lemis.com>; from grog@FreeBSD.org on Sun, Aug 12, 2001 at 06:00:14PM %2B0930 References: <20010810025156.N85642@elvis.mu.org> <Pine.GSO.4.21.0108101106250.9706-100000@gardiner.cs> <20010812180014.D48115@wantadilla.lemis.com>
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* Greg Lehey <grog@FreeBSD.org> [010812 03:29] wrote: > > Linux and rawio are not really compatible. In Linux you have no > choice, you must go via buffer cache; this can give you results which > look much better. Also, sequential I/O is not very informative, > especially if you only have one process. It would be much more > interesting to look at random I/O and not change the default rawio > parameters (in particular, let 8 concurrent processes run). I was going to say that (linux cheats because it doesn't really have raw io), but I wasn't sure I was up to date enough. Thanks for taking the time to explain it. -- -Alfred Perlstein [alfred@freebsd.org] Ok, who wrote this damn function called '??'? And why do my programs keep crashing in it? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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