Upgraded to 2.4.21-rc1-ac4 : now ATA100
OK, I upgraded the kernel to 2.4.21-rc1-ac4 and compiled in the AMD VIPER driver. Now dmesg detects the controller as ATA100 (the actual controller is ATA133) and hdparm benchmark improves from 30Mb/s to 47Mb/s. Can I expect any better than that? Is it possible to detect the controller as ATA133?