LJP 1.0rc7c+ VERY SLOW on T2 but not on T1!

[palmdoogie]

Hello All, I joined this forum to ask a question that is really getting to me. This all started when I installed the latest version of LJP(1.2) on both my Tungsten T and Tungsten T2. On the T|T with UDMH and WarpSpeed (Set to 192) everything works great as expected, however, the exact same setup on my T|T2 (Same SD card and all) runs EXTREMELY SLOW, like 0-3FPS instead of 50-60FPS. My Googling came up with just one obscure reference to this here:

lukas-grundmann.de1.cc/Stuff/WiimoteLJPDoc.pdf

Where in the notes section for the T|T2 it says: "...but LJP 1.2 is much too slow for some reasons"

So, I did the legwork and performed the experiment of trying ALL of the versions still available on little-john.net from Beta 0.9 through 1.2. What I discovered is that something changed from 1.0rc7b to 1.0rc7c where 7b runs fine on the T|T2 (but has the strange artifact of prefixing a random number from 01 to 04 before every ROM in the ROM list), while 7c starts the slow behavior. I also believe I isolated it to the launcher program and not the modules as I mixed and matched the launcher and module sets from all of the rc7 versions (7, 7b, and 7c) and the 7c modules with the 7b launcher still runs fine on the T2. I tried all of the obvious and not so obvious settings (like frameskip) with no luck, and the amount of slowdown suggests something more major than just an emulation setting. The problem appears to be independent of which emulated system I tried(NES, VCS, and GB).

I tested on two different T|T2s with the same results. With that, I expected to see TONS of posts on my topic, but have not found any. I really want 1.1 or 1.2 to run on my T2 because I also have PalmMame, which doesn't run on my T1 even with UDMH. Has anyone had the same issue and if so, is there something I'm missing?

Thanks in advance for any help that comes my way.

[luckyluke]

Thank you for your testing work.

I thought until now that the weak OMAP used in Tungsten T/T2 causes this serious speed problems after Metaview and I had to add a EvtGetEvent loop to the emulation. (mainly this causes a noticeable speed drop in the newest LJP versions, but it is needed to drive the BtLib and handle stuff like incoming phone calls)

Nice surprise. :-) Perhaps Metaview remembers what he changed from RC7b to 7c. I can imagine only that the OS 5.2.1 (Tungsten T runs 5.0) causes this speed problems since the hardware of both devices is very similiar.

greetings,
Lukas

[palmdoogie]

Now that I've managed to get the LJP sources for RC7 and 1.01 to compile, I've been doing some cross module experiments to figure out where the slowdown is occurring. When I modify the sources so that I can build with the 1.01 launcher and the RC7 modules, I still get the massive slowdown(0-1 FPS on NES). WHen I use 1.01 modules with the RC7 launcher, there appeared to be a slowdown (16FPS on NES), however, that may have been due to not running warpspeed, so I may repeat that experiment. That's all I have for now; but I think I'm going to start LJP-Lite in parallel. When I start distilling the code, It may be easier to determine the source of the slowdown...

[_Em]

While you're at it, can you compile a version of 1.2 with the 1.01 SNES module? Then we could play Kart etc. again

[palmdoogie]

Hello Em, I actually don't have the 1.2 sources. I only have what was available for download(RC2, RC7, and 1.01). My LJP-Lite project actually strips out SNES support since it doesn't run well on older units like the TT and TT2 which LJP-Lite is directed toward. However, since I have managed to figure out how to get all three versions to compile, if you can point me to the 1.2 sources, I could take a crack at compiling with the 1.01 version of the SNES module...

[palmdoogie]

Well, I've got it down to three files: LJP-Main.c , App_Func.h, and App_Func.c Somewhere in there lies the key to the T|T2 slowdown. I've successfully merged in most of the other 1.01 source code with no slowdown prior to the above three files(Which contain the bulk of the launcher code). Note that when merging over the emulator modules, I left out the key-remapping which seemed broken compared to RC7(At least on my TT series) as well as two player cycling(Which I may add back in later). I'm still going to distill through the launcher code to see how much I can merge in without the T2 slowdown returning. Mostly because the ROM file display is buggy in RC7(Shows invisible config files and prefixes the ROMs with xx:). Otherwise, I consider this the starting point to my LJP-Lite project. This version is 1.0 Alpha 0. Once I get through the launcher merge, I'll start stripping out the unwanted bits. I'll be starting a new topic for LJP-Lite for all who are interested...

[metaview]

metaviewsoft.de/wordpress/?dl_id=25 the source to 1.2