Hello, Shaohua. On Tue, Jul 30, 2013 at 09:24:14PM +0800, Shaohua Li wrote: > In the raid5 case, it's very hard to keep the order the bios passed in, because > we need read some disks, calculate parity, and write some disks, the timing > could break any kind of order. Besides the workqueue handles 8 stripes one > time, so I suppose this keeps some order if there is. Of course, it can't be absolute but still keeping the relative ordering and temporal locality (ie. issue IOs in order once the XOR calculation of the whole source bio is done rather than issuing as each block completes calculation) would help quite a bit. Thanks. -- tejun -- 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
