Shaohua Li wrote: > hi, > The SATA spec defines DMA setup FIS auto-activate optimization for FPDMA > transfers. I had an attempt to add it, though my test doesn't show obvious > performance improvement (not worse too), I wonder why not add this feature? > > Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx> Eh... It's not clear whether all controllers support AA and it's also not clear whether devices which claim to support AA actually work properly when AA is enabled. For optional features in ATA(PI), the best we can do is probably to allow enabling it from userland or bios. It used to be better for ATA compared to ATAPI but with the introduction of SSDs, the situation has gotten worse rapidly. :-( Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
