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From: brandis@inf.ethz.ch (Marc Brandis)
Newsgroups: comp.windows.ms
Subject: Re: Performance degradation in 386 enhanced mode
Message-ID: <22077@neptune.inf.ethz.ch>
Date: 21 Jan 91 12:30:59 GMT
References: <4491@mindlink.UUCP> <1991Jan18.231328.24340@progress.com>
Sender: news@neptune.inf.ethz.ch
Reply-To: brandis@inf.ethz.ch (Marc Brandis)
Organization: Departement Informatik, ETH, Zurich
Lines: 15

In article <1991Jan18.231328.24340@progress.com> billf@progress.COM (Bill Ferro) writes:
>Now, can anyone explain to us why in 286 virtual mode (where only 1 can exist) is
>faster than 386 virtual mode (many can exist)??????
>
There is no 286 virtual mode. The mode used to run DOS programs under Windows
in standard mode is real mode. Windows saves everything that may be destroyed
by the DOS session to disk before switching to this task. This is the reason
why the switch to such a task takes a rather long time. Note that the amount
of memory saved to disk is around 1 MB.


Marc-Michael Brandis
Computer Systems Laboratory, ETH-Zentrum (Swiss Federal Institute of Technology)
CH-8092 Zurich, Switzerland
email: brandis@inf.ethz.ch