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- Xref: sparky comp.unix.bsd:4115 comp.sys.ibm.pc.hardware:21802
- Path: sparky!uunet!decwrl!netcomsv!mport!admin!jack
- From: jack@admin.mport.COM (Jack Craig)
- Newsgroups: comp.unix.bsd,comp.sys.ibm.pc.hardware
- Subject: Re: Another Adaptec Question
- Message-ID: <866@admin.mport.COM>
- Date: 13 Aug 92 19:59:47 GMT
- References: <1992Aug12.193421.14456@cs.wisc.edu>
- Followup-To: comp.unix.bsd
- Organization: Microport Inc., Scotts Valley, CA 95066 US of A
- Lines: 32
-
- hollings@cs.wisc.edu (Jeff Hollingsworth) writes:
-
- >There seems to be two versions of the Adaptec 1542A card, one that supports bus
- >mastering and one that does not. I have two questions about this:
-
- not quit, the 1542[a/b] both support(are forced to use) bus mastering.
-
- the 1522 is a pio device(no bus master).
-
- >1.) How much benefit is bus mastering for UNIX (assumming the OS supports it)
- A lot! you should talk to neal nelson on this subject, 312-755-1000.
- hes doing a paper on it.
-
- >2.) Does either BSDI or 386bsd support bus mastering?
- its up to the host adapter and its driver.
-
- >One other question, what exactly do the Adaptec cards do that make them
- >more expensive than the Future Domain cards?
-
- i dont beleive the FD card is a bus master. BM takes a cpu on the
- card to do the work, that is part of the cost.
-
- jack...
- =============================================================================
- Jack Craig Microport SVR4 408-438-UNIX uunet!mport.com!jack
- =============================================================================
-
- >-------------------------------------------------------------------------------
- >Jeff Hollingsworth Work: (608) 262-6617
- >Internet: hollings@cs.wisc.edu FAX: (608) 262-9777
- >Home: hollings@warthog.madison.wi.us Home: (608) 256-4839
- >X.400: <pn=Jeff.Hollingsworth;ou=cs;o=uw-madison;prmd=xnren;c=US>
-