On 2011-09-15 04:49, Zhang Taile wrote: > Hi , > Understand now. > One more question, what backlog for? Why read only with verify do not > need it? It's not strictly necessary for most cases. For random writes, we can verify faster by doing it in disk order instead of in write order. If you are using trim to discard parts of the ranges, then we need those appropriately marked in memory. But we can/could relax it a bit and save the memory. I don't think I've had this complaint before, I guess people generally have plenty of RAM these days :-) -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
