Date: Fri, 07 Apr 2000 12:59:48 +0000 From: Gustavo V G C Rios <kernel@tdnet.com.br> To: Nick Sayer <nsayer@quack.kfu.com> Cc: Alfred Perlstein <bright@wintelcom.net>, freebsd-hackers@FreeBSD.ORG Subject: Re: Is traditional unixes kernel really stable ? Message-ID: <38EDDBC4.51F2414D@tdnet.com.br> References: <38ED128C.22C3AA28@tdnet.com.br> <20000406192206.N22104@fw.wintelcom.net> <38ED233E.74716D02@tdnet.com.br> <20000406230234.B4381@fw.wintelcom.net> <38EDD209.421EF9B0@tdnet.com.br> <38EE0536.F2305A40@quack.kfu.com>
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Nick Sayer wrote: > > Gustavo V G C Rios wrote: > > > Why not starting a microkernel arch? > > IMHO the microkernel is the emperor's new clothes (so is OOP, but that, > I suspect, I won't > get quite so much agreement on). > > Context switching has been mentioned, but in addition to that, the real > problem is that it > really doesn't change anything. It may somewhat simplify a non-critical > driver like a serial > port or a mouse or the like, but if a SCSI HBA driver crashes, it's > likely going to make > life for the microkernel very hairy, just like it would a full kernel. > > And a driver bug can cause the hardware to wedge the machine whether the > driver is in > protected or user mode too. > > Most people who I talk to who bring up microkernel do it because they > see the process of compiling > a FreeBSD kernel and think that microkernels are somehow the opposite of > that. If that's the > case, they should believe that Solaris is a microkernel, which it > patently is not. > > NT comes closer, with its rings of protection, but you can hardly call > that a picture of > stabiliy. Yeah! I had started to study OS (UNIX Internals: the new frontiers) internals. That book tell the same about microkernel, but when i downloaded QNX demo disk i got confused. If microkernel has such a drawnbacks, why QNX is so fast and reliable? Should you download it too, and realize what i mean. Thanks a lot for the patience. PS: I am just a beginner, so, don't take me wrong. The fact is that i am really confused about what books say about microkernel and what in that single demo floppy. I would be really glad to have some here to kindly clarify it to me. -- If you're happy, you're successful. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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