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- From: peter@global.hacktic.nl (Peter Busser)
- Newsgroups: comp.sys.ibm.pc.misc
- Subject: Re: 486 vs. 386
- Message-ID: <1992Nov14.113848.617@global.hacktic.nl>
- Date: Sat, 14 Nov 1992 11:38:48 GMT
- References: <1992Nov11.164527.23898@exu.ericsson.se> <1992Nov12.014526.16459@leland.Stanford.EDU>
- Organization: Global Village 1
- Lines: 39
-
- spagiola@frinext.stanford.edu (Stefano Pagiola) writes:
-
- >today's software will simply not run adequately on a 286;
-
- Because today's software is written for 386's and real operating systems,
- both can't run on a 286.
-
- >some of it is borderline on a 386.
-
- Well, it's often the lack of memory that slows things down. You can't expect
- to run a nice user graphical interface and several tasks on a 386SX@25MHz in
- 4M memory (the X11 server alone sometimes takes 1.5M on my machine, and I'm
- not even talking about things like GCC :). A faster disk is a good idea too.
-
- What I mean is that not all problems can be solved only by buying a fast
- processor. I know someone who bought a fast 486 motherboard so that his
- FidoNet software would spend less on processing the FidoNet traffic. Gee what
- a moron! That's just throwing money in the river! Procesessing FidoNet mail
- is 100% *disk* bound. If disk I/O is the bottleneck, then buying a faster
- processor won't help a bit (except to empty your wallet).
-
- >If you want to run that software, and newer
- >one on the way, you'll need more power. If you want a nicer
- >interface, you'll need more power.
-
- What 'we' in the PC world do is to cover up the obscenities in the architecture
- with a faster CPU. For instance, with IDE harddisks the CPU transfers *every*
- single byte to and from the disk. At the time it transfers to/from disk, it
- can't do anything else. So a program which accesses a disk 50% of the time
- allows other tasks to run for the other 50% of the time. Thus your machine
- 'slows' down to 50%. Instead of using DMA, which has an efficiency of 90% or
- higher, we buy a 2 times faster CPU so that it can do 2 times more work in
- the 50% of the time it can do real work. Get the picture? In short, to get
- more work done, you can choose to use your CPU more efficient or add more CPU
- power. I don't say that one of the solutions is good or bad, but it clearly
- shows that we do not *NEED* more processing power per se.
-
- Greetings,
- Peter Busser
-