:> :sits on irq 14 & 15 making them the lowest priority devices in the system,
:> :and that could cause the interrupt latency I'm seeing which then again
:> :causes the bad transfer rates on transfers that need to transfer more
:> :that one transaction full of data (ie max 128k).
:> :
:> :-Søren
:>
:> The larger transfers are probably choking the IDE drive's pipelining
:> capabilities. That's my guess, anyway. I avoid IDE like the plague.
:
:No, not true, if the same drive is put on a PCI based ATA controller
:you get the expected transfer speed upto the drives cache size.
:
:-Søren
Ahhh. Hmm. That is very odd then. Even at irq 14/15 the interrupt
priority should not make a difference, at least not in a simple test
when the machine isn't doing anything else.
-Matt
Matthew Dillon
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