home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.os.os2.programmer
- Path: sparky!uunet!darwin.sura.net!nntp.msstate.edu!Isis.MsState.Edu!it1
- From: it1@ra.msstate.edu (Tim Tsai)
- Subject: Re: Hard Disk Interrupts?
- Message-ID: <it1.712189719@Isis.MsState.Edu>
- Organization: Mississippi State University
- References: <1992Jul26.150420.3389@rock.concert.net>
- Date: Sun, 26 Jul 1992 22:28:39 GMT
- Lines: 19
-
- rls@.wedge.nt.com (Robert L. Smith) writes:
- > I've been using OS2/2.0 for a month or so, on a '386DX with two
- >hard drives, and get the impression that OS2 does nothing else --
- >i.e., suspends multitasking -- while a hard disk operation is in
- >progress. If true, the reason may be that OS2 must poll the hard
- >drive adapter to detect completion. One piece of evidence for this
- >conclusion (among others) is that a simple disk-to-disk copy operation
- >in one partition disrupts a 9600-baud com transfer controlled by
- >another.
-
- Chances are your SCSI adapter is holding up the ISA Bus too
- long during a DMA transfer. I'm using an Always IN-2000 with
- the INT13 driver and I do not have any problems with high speed
- transfers. The IN-2000 uses programmable IO and does not use
- DMA. I tried a bus-mastering DMA controller before and I can't
- successfully transfer a file at 19.2K even under DOS, let alone
- OS/2. I'm waiting for an OS/2 driver to come out before I pass
- final judgement, but I'm not optimistic.
-
-