Date: 13 Jul 2001 18:06:35 PDT From: Nitin Nahata <nitinnahata@usa.net> To: freebsd-hackers@freebsd.org Subject: Re: [Re: Block Device I/O] Message-ID: <20010714010636.14102.qmail@nwcst320.netaddress.usa.net>
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Julian Elischer <julian@elischer.org> wrote: > we couldn't find any reason th have block devices except in teh case for > exporting the nodes via NFS. > > The buffer caching is done at teh filesystem level, and raw-io is faster > with the raw device, so it was complicating the code without giving us any > real advantage.. If you need a cached device then you can achieve that in > other ways. > your comments are appreciated.. > > Are there any documents/papers available regarding the current I/O implementation because I am having a little difficulty in understanding how things are working below the vnode/vfs layer? Thanks, Nitin > On 13 Jul 2001, Nitin Nahata wrote: > > > I saw an old message in 1999 freebsd-hackers archive that said that block > > devices were being replaced from freebsd. I tried to follow the trail of > > the message but could not find anything more.......Also I could not find > > any bdevsw[] in the code. I shall be thankful if anyone could give any > > further references about how Block I/O is being implemented now... > > > > Thanks > > > > Nitin > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-hackers" in the body of the message > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the messagehelp
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