> to turn OFF interrupts during PIO. This is dumb. The correct solution is
> to turn OFF write-behind caching which does nothing to improve performance
> because one seldom writes the same thing over-and-over again to the same
> memory location in real world applications.
Except on the stack, it is worth keeping the stack in the cache and using
write back memory for stack areas. Especially on Intel with its short
register set which makes stack memory traffic much higher than on RISC.
Besides that, write back caches are a gain with FFT. Have a look at the
addressing pattern of a, say, 4096 complex point (of course in-place) FFT.
Greetings,
Gabriel.