[Forum] Try only to realise the truth | ANN.lu |
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Try only to realise the truth : Comment 227 of 335 | ANN.lu |
Posted by Johan Rönnblom on 06-Jul-2004 09:39 GMT | In reply to Comment 226 (Chris Hodges): Chris: Well, the problem can be "solved" in Linux too, either by
turning of caches or running a version of Linux that doesn't require
cache coherency. The former method gives an extreme speed penalty of
course, the latter also gives a speed penalty, and probably means that
many drivers won't be available.
To "solve" it in OS4 is really no different. It can be done, but with
a significant performance penalty. Let me quote the old RKM:s for
CachePreDMA:
"[..]
With a Bus-Snooping CPU, this function may end up doing nothing.
[..]"
Which is exactly what you want for modern hardware, for performance
reasons. |
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