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[Events] Notes about my presentation at the Alchimie 4 showANN.lu
Posted on 29-Sep-2004 10:40 GMT by Stéphane Guillard427 comments
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The html pages I made available was only a starter slideshow for my presentation. Here are a few words about what I shown, and what I said. Hi Gentlemen,

The html pages which are available at my site are just an introduction slideshow that I presented as a starter, it does not relate what I shown and said afterwards. Please find below a couple of notes about my presentation at Alchimie show.

Here is a quick summary of the presentation I did :

- I booted with boot delays set to 1 second for UBoot and for SLB (second level booter), thus less than 20 seconds after power on, we were with a fully loaded Workbench with Amidock.

- I started with the small html slideshow, presented on IBrowse. You can find those pages at the URL above. IBrowse loaded in 2 seconds with its About: page fully displayed. Browsing through the pages of the slideshow was instantaneous.

- While we were at it, I browsed the OS4 install guide, also as fast as can be, must say I also find this responsiveness impressive myself :)

Then I demoed as many things as I had time to during the 2 hours I had. Everything worked, fast & stable, and was smooth and impressed. I showed mainly:

- All os4 system, tools, utilities, prefs & stuff

- MUI, IBrowse, Amitradecenter

- Yam, SimpleMail

- ClassAction (M. Elsner's file manager)

- MakeCD

- MooVid running a DivX

- DVPlayer running an mpeg2

- AudioEvolution 4 with the demo project, cursors auto moving smoothly, the playback was smooth also, with mostly no CPU usage.

- AmiPDF with the AE4 manual and another heavy PDF file, very fast

- USB. I plugged a Microsoft IntelliMouse Optical into my USB hub, and we had 2 mice to control the system

- Crisot's slach5 winning demo (got applauses which it deserved)

- chip's rayrace realtime raytracer demo. When the juggler appeared, audience was impressed, but really took measure of what they were watching when I moved the mouse. Wait for the Altivec version !

- FPSE, AmiDog's PS1 emulator, with an oldskool game which ran nicely ('Cotton')

- some other visual toys I had at hand

The demos only grimreaped twice, and I anticipated the grims before they popped up :

- One was native glsokoban / w3d, when I launch it does a base page access (a “null pointer” bug in glsokoban). I didactically shown the disassembly which is available in the grimreaper window, was a store to r4, r4 was null etc. I clicked on continue, and it all went fine & fast.

- One was frying pan 0.3.1, I shown the app, and at one point I said 'now it should grim’ and it did. It still loaded fine though. I quit the app, clicked on reboot and less than 4 secs after, wb was up with amidock. That was the only reboot of the show.

I forgot to show (because of short time):

- Petunia... Almos, sorry, I had prepared something for that (side by side windowed jit & nonjit runs of voxelspace), but i both forgot, and was asked to stop at this point by the party organizers cause it was already 5:30 pm while I was scheduled until 4pm.

- ArtEffect

- USB with MassStorage (ie USB key or digital camera)

At the end, I had many fair questions to which I answered; my feeling is that the audience really appreciated the effort behind what I shown, and was conscious that we are not far away from a releasable 4.0.

Then came the expected question, 'and why doesn’t DMA work ?'

I said 'All what you saw was DMA since the 1st boot'.

I copied a few 100 MB files in a snap, with zero CPU (thanks to Pete Gordon for the clock/CPU docky, helps a lot). Then I switched to PIO, they saw 4 x slower and 80% CPU.

The audience understood that it was indeed DMA, and that was fast, and that was part of the overall smoothness of what I shown.

Then I explained the things below (this is the reference for my statements, please don’t rephrase or extrapolate or invent or whatever):

- IDE UDMA works on VIA and Articia on AmigaOne SE / XE / µA1 MK2 (as I demoed) ...

- ... except when the Ethernet chip goes online and is used.

- the Ethernet chip only triggers the problem, but it is not at all related to it (a test using a PCI Ethernet shows the same behaviour)

- We have made a driver for a Silicon Image 680 PCI IDE UDMA133 controller chip, this does UDMA 133 nicely, including when Ethernet is used at full speed.

- The fact that a PCI IDE controller solution works, shows that the problem is *not* related to Articia, since PCI DMA is *also* handled by the Articia, and that works.

- The full Alchimie show demo was done using UDMA, both from the VIA and from the Si680, without problem (but with Ethernet off, would the Ethernet have been turned online, I would have had to revert the VIA into PIO before).

- Things are currently under more investigation

In the meantime there are 2 options for existing A1 board owners:

- Use the VIA IDE controller in PIO mode when using Ethernet, and UDMA at other times,

- Purchase a faster (UDMA133) Silicon Image 0680 IDE PCI card (from around $20). This is my personally recommended option as the delivered speed is noticeable faster than the on-board VIA controller in UDMA mode.

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Notes about my presentation at the Alchimie 4 show : Comment 316 of 427ANN.lu
Posted by Michal Schulz on 01-Oct-2004 03:11 GMT
In reply to Comment 301 (Fabio Alemagna):
Yes. But in this case that would mean that the buffer passed to the OS4's ATA driver has to be already aligned, which may or may not be true. It's one of the reasons why ata.device in AROS will abandon DMA transfter and will use PIO mode if the buffer is inproperly aligned (but in this case that means the bufer starts at ODD address :)))
#317 Fabio Alemagna
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