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- Path: mail2news.demon.co.uk!dookie.demon.co.uk
- From: Jonathan Belson <jon@dookie.demon.co.uk>
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: New C2P
- Date: Sun, 14 Jan 96 16:32:23 GMT
- Message-ID: <9601141632.AA00423@dookie.demon.co.uk>
- References: <4ctiib$2ok@irz305.inf.tu-dresden.de> <38231962@kone.fipnet.fi> <9601111903.AA0041d@dookie.demon.co.uk> <4d5m8o$f38@brachio.zrz.TU-Berlin.DE>
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-
- Philipp Boerker (rawneiha@w352zrz.zrz.TU-Berlin.DE) wrote:
-
- : >: It is because of the instrction burst in the 68030 and upwards.
- : >: They benefit of having the loop startpoint 16 bytes aligned.
- :
- : >For burst mode to make a difference in execution speed, you need static
- : >column RAM, surely?
- :
- : No, you don't. Try your 030 with Instr Burst disabled...
-
- I tried SysInfo with all combinations of IBurst and DBurst, no difference
- at all.
-
- I had a look through one of my university texts : 'During a read miss, the
- cache may optionally fill the entire cache line from main memory using four
- longword read operations in a special burst mode. This feature improves
- the performance of systems with certain types of memory chips that can read
- from consecutive addresses faster than they can read from "random"
- addresses' [Wakerly], ie. static column ram.
-
- C-YA
- Jon
-