From: Andi Kleen <andi@xxxxxxxxxxxxxx> Date: Sun, 13 Jul 2008 15:50:55 +0200 > Still I would expect that modern IO controllers are typically fast > enough at processing SG lists that it shouldn't matter much. I know it matters a lot on sparc64 ESP scsi controllers. You can only have one address/len pair DMA'ing at a time and you have to service an interrupt to load in the the next DMA sg elements into the chips registers. Merging is essentially a must for performance on those cards. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
