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- Path: sparky!uunet!olivea!xenitec!news
- From: paul@openage.com (Paul A. Fischer, Sr UNIX Sys Consultant)
- Newsgroups: biz.sco.general
- Subject: Re: Performance degradation under SCO UNIX
- Message-ID: <9212300856.aa15942@openage.COM>
- Date: 30 Dec 92 13:56:49 GMT
- Sender: news@xenitec.on.ca (xenitec.on.ca News Administrator)
- Organization: [resent by] The SCOGEN gateway and Propagation Society
- Lines: 31
- Resent-From: mmdf@xenitec.on.ca
- Submit-To: scogen@xenitec.on.ca
- Precedence: bulk
-
- >> Then make
- >> sure the BIOS shadowing is turned on.
-
- >DOS Shadow BIOS? Why? Last I heard, this is just wasted RAM,
- >not that we can address that range on most motherboards anyway.
- >What do you know that I don't?
-
- >> You might also give more info on what
- >> ethernet boards are running, and wether this lotus slowdown is a DOS lotus slow
- >> down, or a UNIX lotus slowdown.
-
- >Even if it's run under DOS, under, say Merge, we don't use DOS
- >shadown BIOS, do we?
-
- The way I understand it is this. The OS (DOS and UNIX/XENIX) need to access
- the system BIOS quite often (a few times a second). By copying this
- information from the BIOS chips which are 8-bit on a 8MHz bus, into RAM which
- is 32-bit and runs at the same MHz rating as the processor, we can access this
- information much quicker. This is most noticable when SCO boots and displays
- the hardware information. With BIOS shadowing off it takes several seconds,
- but it screams by with the BIOS shadow on. You might try it for yourself.
-
- Somewhere in the dark recesses of my mind I remember that UNIX/XENIX might
- internally cache this information when it boots. I wonder if Bela or another
- SCO Wiz can tell us if this is true.
-
- --------------------------------------------------------------------------------
- Independent SCO support and service provider in the D.C. metro area.
- Insert clever saying here...
- Paul A. Fischer | Open Age Inc. | paul@openage.com
- Sr. UNIX Sys. Consultant | (301) 948-6422 | (301) 948-9644 Fax
-