On Tuesday June 13, xshu2006@xxxxxxxxx wrote: > in linux raid4/5/6 ,one big bio will span several devices,and There > may be several bio's per stripe+device.if the bio arrived in bi_sector > with overlap,we must wait the former bio to be finished. > why not we split the bigger bio into small ones?we can attach the > smaller bio to the stripe+device (here we may can do some merge ).one > disk i/o we can finish many small bios.if all the small bios of the > request be finished ,we can return the request. Overlapping bios are expected to be extremely uncommon, so any optimisation is pointless. Do you have reason to believe that overlapping bios are sufficiently common that the current code is causing problems? NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
