increase the 256 byte Icache

turrican3 · 16 November 2019, 07:43

Hi toni,
The i cache of a 68020 is 256 byte,
what should happen if winuae give the possibility to increase it ?
or the ICache of the 68060 or others versions ?? Or the Dcache ??

Could winuae increase it or his speed ???
I have the feeling that winuae did it already with some settings, i mean the speed, not the size ??
ps: do you have any intentions to emulate the cpu 68080 from the vampire or something else from it ?

Toni Wilen · 16 November 2019, 10:07

No. Emulating cache makes emulation slower. More to do = more CPU power required.

And No.

meynaf · 16 November 2019, 10:42

If you want super-fast cpu on winuae, just select "Fastest possible" and activate JIT. The cpu type does not matter. Target cpu's caches are not emulated at all, but it will use the host cpu's caches which are in the megabytes range.

PeterK · 16 November 2019, 13:44

Yes, "Fastest Possible" and "JIT" enabled are the most important settings for best speed, but also drag the "CPU Idle" slider to the leftmost position and for the UAE graphics board you can enable "Multithreaded".

Btw, on my Mini-PC with N4100 CPU, 2*2 MB cache, it seems to be a little faster to use only 8 MB JIT cache instead of the maximal 16 MB.

On the Windows side make sure that all the Amiga partitions or directories are added to the exclude list of the Windows Defender real-time protection or other malware scanners.

turrican3 · 19 November 2019, 01:23

Good advices guys,

and thank you toni for the reply.

16 November 2019, 07:43	#1
turrican3 Moon 1969 = amiga 1985 Join Date: Apr 2007 Location: belgium Age: 48 Posts: 3,913	increase the 256 byte Icache Hi toni, The i cache of a 68020 is 256 byte, what should happen if winuae give the possibility to increase it ? or the ICache of the 68060 or others versions ?? Or the Dcache ?? Could winuae increase it or his speed ??? I have the feeling that winuae did it already with some settings, i mean the speed, not the size ?? ps: do you have any intentions to emulate the cpu 68080 from the vampire or something else from it ? Last edited by turrican3; 16 November 2019 at 07:49.

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16 November 2019, 10:07	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,506	No. Emulating cache makes emulation slower. More to do = more CPU power required. And No.

16 November 2019, 10:42	#3
meynaf son of 68k Join Date: Nov 2007 Location: Lyon / France Age: 51 Posts: 5,323	If you want super-fast cpu on winuae, just select "Fastest possible" and activate JIT. The cpu type does not matter. Target cpu's caches are not emulated at all, but it will use the host cpu's caches which are in the megabytes range.

16 November 2019, 13:44	#4
PeterK Registered User Join Date: Apr 2005 Location: digital hell, Germany, after 1984, but worse Posts: 3,365	Yes, "Fastest Possible" and "JIT" enabled are the most important settings for best speed, but also drag the "CPU Idle" slider to the leftmost position and for the UAE graphics board you can enable "Multithreaded". Btw, on my Mini-PC with N4100 CPU, 2*2 MB cache, it seems to be a little faster to use only 8 MB JIT cache instead of the maximal 16 MB. On the Windows side make sure that all the Amiga partitions or directories are added to the exclude list of the Windows Defender real-time protection or other malware scanners.

19 November 2019, 01:23	#5
turrican3 Moon 1969 = amiga 1985 Join Date: Apr 2007 Location: belgium Age: 48 Posts: 3,913	Good advices guys, and thank you toni for the reply.

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