[Forum] Articia: Still DMA-problems? | ANN.lu |
Posted on 20-May-2003 11:16 GMT by Senex | 122 comments View flat View list |
From a news-item at VGR.com it appears that the current Articia-northbridges might still have DMA-related problems:
"Mr. S.W. who sends over screen shots of newer AmigaOne 800mhz G4 hardware, has sent over 2 screen shots of the new A1 with G4 running 'amigaone xe/g4 7451 800mhz, excalibur radeon 9000 pro 64mb ddr ram, valueram kvr133x72rc3/256 kingston'. He wants to know '.. if other aone users have that problem as well..', 'it never outputs the same checksum with dma enabled when testing an iso file which is larger than the swap space used'
You can see the Radeon 9000 Pro screen shots here: DMA On & DMA Off."
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Articia: Still DMA-problems? : Comment 113 of 122 | ANN.lu |
Posted by Anonymous on 22-May-2003 20:14 GMT | In reply to Comment 100 (Kjetil): > // The point is that this CRC-check nicely hides the possible bugs.
>
> It can only indicate a problem it's no shore thing.
Kjetil, you don't get it do you?
When TCP/IP receiver find a bogus checksum, it will not ACK the packet and eventually the sender will resend the packet it didn't get ACK for. This is 100% transparent to the higher level.
Sending or receiving applications will never know there was any transmission problem at all, in case the packet can eventually be sent. So this hides data corruption bugs. If you are trying to figure out if the system corrupt data, you do NOT use systems with automatic error correction to test it.
Running cksum or md5sum on large file, however, has no such automatic error correction, and thus reveal the problem much easier.
Get it now? |
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