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- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!comp.vuw.ac.nz!cc-server4.massey.ac.nz!NPerry
- From: news@massey.ac.nz (USENET News System)
- Subject: Re: SPEED and SPEED your IIsi
- Message-ID: <1992Nov12.224227.1631@massey.ac.nz>
- Organization: Massey University
- References: <pmontan-101192150035@paulmac.nswc.navy.mil>
- Date: Thu, 12 Nov 92 22:42:27 GMT
- Lines: 44
-
- From article <pmontan-101192150035@paulmac.nswc.navy.mil>, by pmontan@nswc-wo.navy.mil (Paul Montanaro):
- > In article <1992Nov8.114114.24899@news.Hawaii.Edu>,
- > guiyu@spectra.eng.hawaii.edu (Kui Yu Chang) wrote:
- >>
- >> For those who still don't know, I just read something here that says by
- >> setting the Disk Cache in Sys7 to 768K, you get faster screen updates on
- >> your Macintosh IIsi because all the RAM in Bank A(where the video memory
- >> is also allocated)will be used-up.
- >>
- >> I did an EXPERIMENT immediately and find that the speed-up is IMPRESSIVE!!!
- >>
- >> All the machines below have similar system configuration, the IIcx uses a
- >> standard MacII 8.24 graphics card though.
- >>
- >> Machine Before After set Cache -> 768K Speed-up
- >> ======= ====== ======================= ========
- >> Mac IIcx 5.08 secs 5.08 secs N.A.
- >> Mac IIsi 8.58 secs 5.08 secs 1.69
- >> Mac IIci 4.63 secs 3.66 secs 1.27
- >>
- >>REST DELETED
- >
- > Try redoing your test with lots of inits loaded. I think you will find
- > that
- > in this case having such a high cache setting is not necessary. That's
- > because the inits also fill up the RAM in Bank A. On my IIsi with lots of
- > inits I found the optimum cache setting to be between 128K - 256K. Also
- > according to Speedometer 3.1, setting the cache too high to 768K causes the
- >
- > disk speed to slow down dramatically.
-
- See the timings I posted a short while ago. Setting the disc cache to anything
- other than 32K has a major impact on disc I/O for sequential read/write.
- If you have init's etc. - I have macsbug in there which helps I think -
- you can easily use up the IIsi's 1Mb on board and get the video speedup
- (with no init's the cache size required is 384k).
-
- --
- ---
- Dr Nigel Perry Email: N.Perry@massey.ac.nz
- Department of Computer Science Tel: +64 6 356 9099 ext 8900
- Massey University Fax: +64 6 350 5611
- Palmerston North
- New Zealand
-