On 2012-10-05 11:41, Georg Schönberger wrote: > Hello, > > this topic is not directly connected to Fio but nevertheless reasonable for all Fio Users. > I am currently working on IO Scheduler Diagrams explaining how they process IO requests. > > Attached you find my first draft, I've already had some input from Christoph Hellwig. I would be happy > if I get more feedback as I am not sure if everything is correct, especially with CFQ I had some problems drawing it. Two comments: - For deadline, the FIFO queues are just for tracking the ordering of the requests. They serve no other purpose than to restart the position inside the sorted tree (which is a tree, btw, it's not a linked list or FIFO as the diagram would lead you to believe). - For CFQ, the async queues are per-disk and split in prio classes and priorities. The sync queues are per-process per-disk. Your graphic doesn't really show that, it's a fairly complex relationsship. -- 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
