[Forum] Try only to realise the truth | ANN.lu |
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Try only to realise the truth : Comment 304 of 335 | ANN.lu |
Posted by Bernie Meyer on 07-Jul-2004 11:00 GMT | In reply to Comment 290 (Don Cox): IIRC, the PPC can handle several page sizes, with 4096 bytes being the smallest.Speaking from experience, targets for disk transfers in classic AmigaOS programs are rarely even 512-byte aligned, let alone 4096-byte aligned, and it's quite conceivable that the rest of those 4096 bytes might be allocated to frequently-used data. So making the whole page range covering a DMA target non-cacheable is quite likely to inflict a crippling performance penalty on the CPU's other work which is supposed to go on during the transfer. |
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