On Thu, Jul 23, 2009 at 11:59:11AM +0800, Jeff Garzik wrote: > 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> > > I agree, we should turn it on -- but doesn't this also have a controller > dependency? > > IIRC, not all NCQ-capable controllers support this feature... SATA 1.0 > hardware may not behave properly in response, no? It appears the AHCI spec doesn't define a HBA capability about this feature, but I'm likely wrong as I'm not quite familar with SATA. Thanks, Shaohua -- 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
