Make sure DMA is enabled on hard disks, and that support for the systems IDE controller is compiled into the kernel, and that the appropriate IDE driver is being used (and generic IDE is not).
... and hope that your crappy board doesn't always fall back to PIO modes :-) using SCSI / FC / ... should give better and more consistent performance.
Also worth noting, the libata SATA drivers only support DMA so will not fall back to any slower modes.
Daniel
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