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- From: poffen@sj.ate.slb.com (Russ Poffenberger)
- Subject: Re: Windows 3.1 on 486/33 - double buffering
- Message-ID: <1993Jan25.235021.6315@sj.ate.slb.com>
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- Organization: Schlumberger Technologies, ATE division, San Jose, Ca.
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- References: <1329@alsys1.aecom.yu.edu>
- Date: Mon, 25 Jan 93 23:50:21 GMT
- Lines: 37
-
- Chaim Manaster (manaster@yu1.yu.edu) wrote:
- : >> If SmartDrive is unsure its
- : >>a good idea to install in anyway.
- : >
- : >I disagree. Trying it on my SCSI drive, the start-up time of windows
- : >doubles with double buffering installed. And this also reflects on all
- :
- : Fine, but if you then discover that you needed double buffering,
- : what consequences have you suffered.
- :
- : In other words, if your system needs double buffering and you did
- : not invoke it what disasters befall your system. Are these
- : consequences gradual, or do they occur in one fell swoop. Where do
- : you look to find these consequences that may or may not occur.
- :
- : What is it about SCSI and ESDI drives (Ihave one of each) that
- : incur the wrath of no double buffering?
- :
-
- Where the problem comes in, is with DMA bus master type cards. These need
- an area of low memory for their DMA buffers. An ASPI manager (at least
- Adaptec's) provides this, and hooks INT13 to make sure all plays well.
-
- What will happen most likely, is that if you don't have an ASPI manager,
- and you load your disk cache into high memory, then invoking Windows will
- usually corrupt your disk, and do so very quickly. This is because Windows
- uses upper memory regions, and will conflict with the DMA buffer.
-
- SmartDrv in double buffer mode will avoid this by using 2 buffers, but
- performance suffers. Loading a good cache, like hyperdisk in low memory,
- also avoids the problem. If you want the cache loaded high, and run
- Windows, then load the ASPI manager and all will be OK.
-
- Russ Poffenberger DOMAIN: poffen@sj.ate.slb.com
- Schlumberger Technologies ATE UUCP: {uunet,decwrl,amdahl}!sjsca4!poffen
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