On Fri, 9 Apr 2010 10:08:33 +0100 Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote: > You also don't get the CPU having to handle each command itself and poke > the drive which causes signficiant stalls (doubly so because Jeff Garzik > hasn't applied my patches to fix the bogus ones yet ;)) > > So not only do you get 64bit DMA and NCQ but the inter command delay is > lower so its faster overall. You also get less CPU stalls for I/O which > can be very slow with legacy mode although it usually only upsets real > time people. Interesting. With my old motherboard (sata_nv) I used to have some stalls, mainly on GTK+ apps like Claws-mail during intense I/O and Firefox. Now with AHCI it's barely noticeable, but it happens too, although not as frequent as it used to happen with sata_nv. I hope your patches get applied soon. -- -- 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
