Date: Thu, 18 Jun 1998 22:03:50 -0400 (EDT) From: "Matthew N. Dodd" <winter@jurai.net> To: IBS / Andre Oppermann <andre@pipeline.ch> Cc: spork <spork@super-g.com>, hackers@FreeBSD.ORG Subject: Re: Disk Cache Message-ID: <Pine.BSF.3.96.980618220132.14853M-100000@sasami.jurai.net> In-Reply-To: <358998E2.32A7AF2F@pipeline.ch>
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On Fri, 19 Jun 1998, IBS / Andre Oppermann wrote: > You better spend the money on 'real' RAM, FreeBSD does a better job > managing cache then every caching controller because FreeBSD 'knows' > what it needs next, the caching simply reads ahead. For read caching this statement is true. > > The kernel has no way of knowing that some things are already cached out > > beyond the SCSI card, so I assume it would cache something that's already > > cached, right? How do you work around that? Is there some way of telling > > There's only one 'workaround': disable caching in FreeBSD with the > "sync" > mount option. Now you are talking about write caching which is a completly different matter. Write caching should be a big win as it allows more efficient use of your drives (by reducing seeks when your data has a high locality of reference.) /* Matthew N. Dodd | A memory retaining a love you had for life winter@jurai.net | As cruel as it seems nothing ever seems to http://www.jurai.net/~winter | go right - FLA M 3.1:53 */ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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