> No, not that I remember, it looked like from the factory. > > But I was also referring to something like [1]. And I also seem to > remember similar issues with ALi/ULi chipsets (e.g. used in Blade 100 > and 150). > > [1]: https://ata.wiki.kernel.org/index.php/Pata_cmd64x#Limitations
Found it in the source... https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/ata/pata_cmd64x.c#n386 It's similar for older CMD64x drivers (pre-libata). And some ancient discussion here: http://lkml.iu.edu/hypermail/linux/kernel/9811.3/0154.html Now that's just sad. :( MWDMA2 is limited to 16.7MB/s, half the speed of UDMA2.