Messages in this thread | | | Subject | Re: [PATCH] take 48-bit lba a bit further | From | Alan Cox <> | Date | 06 Apr 2003 15:35:25 +0100 |
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On Sul, 2003-04-06 at 14:32, John Bradford wrote: > Then, don't we want to be using 48-bit lba all the time on compatible devices > instead of falling back to 28-bit when possible to save a small amount of > instruction overhead? (Or is that what we're doing already? I haven't really > had the time to follow this thread).
The overhead of the double load of the command registers is microseconds so it is actually quite a lot, especially since IDE lacks TCQ so neither end of the link is doing *anything* useful. SCSI has similar problems on older SCSI with command sending being slow, but the drive is at least doing other commands during this.
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