| [Forum] AmigaOne's *software* DMA | ANN.lu |
| Posted on 05-Jul-2004 01:07 GMT by atmel | 24 comments
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I would like to know why the AmigaOne has a software-based DMA instead of having a northbridge that has hardware DMA built-in?
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List of all comments to this article| Sorted by date, most recent at bottom |
| Comment 1 | Anonymous | | 04-Jul-2004 23:15 GMT |
| Comment 2 | tinman | | 04-Jul-2004 23:34 GMT |
| Comment 3 | Anonymous | | 05-Jul-2004 02:48 GMT |
| Comment 4 | Anonymous | | 05-Jul-2004 02:55 GMT |
| Comment 5 | the man in the shadows | | 05-Jul-2004 03:12 GMT |
| Comment 6 | priest | | 05-Jul-2004 05:33 GMT |
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| AmigaOne's *software* DMA : Comment 7 of 24 | ANN.lu |
| Posted by priest on 05-Jul-2004 05:40 GMT | In reply to Comment 3 (Anonymous):
"...the Amiga has always handled cache coherency in the OS."
Really? What is the source of that information? Could you provide link to the source?
"This allows for smoother multitasking, because that way the exact time the brief bus stall that happens when the caches are synchronized, is fully under the control of the OS."
Hmmm. It definitely opens some new niche possibilities....
"Why do you think that even Linux has problems playing video and audio, unless you use "mpeg accelerators" that buffer raw undecoded data and decode it on the video card itself? After all, a 2GHz P4 should be more than capable of decoding mpeg video, yet if you use a card that does not have "mpeg acceleration" (or the drivers don't enable it) still manages to stutter. Those brief stutters are caused by the NB syncing the caches without the knowledge of the OS."
Interesting theory indeed.
How does MOS handle cache coherency, I bet it's done by the HW (April chip).
How smooth is the multitaskin/multimedia on MOS? |
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| List of all comments to this article (continued) |
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