Messages in this thread | | | Date | Thu, 25 Jul 2002 07:17:55 -0400 (EDT) | From | Bill Davidsen <> | Subject | Re: Safety of IRQ during i/o |
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On 25 Jul 2002, Alan Cox wrote:
> There are also some older systems where if the block transfer of the IDE > data didn't keep up with the controller instead of handshaking properly > it kind of dribbled random numbers onto the disk. > > Unless anyone knows of PCI era devices with this problem I would be > inclined to agree that we should default to IRQ unmasking in the 2.5 IDE > code if the IDE controller is PCI.
Certainly if the controller is running in DMA mode. If running in PIO mode I would think you could still have a problem if the transfer was stopped mid-block. Perhaps I'm paranoid, is that a "can't happen" now?
> For old ISA/VLB controllers its safer left as is, and nobody running a > machine like that can realistically expect good performance without hand > tuning stuff anyway
I would think the guts of PIO block transfer would have to be protected anyway, but that's a very small part of the code.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.
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