Tejun Heo wrote: > >Anyways, anticipatory rules, great. I don't know why NCQ is showing >worse performance w/ AS, but I'm pretty sure it's something which can be >fixed. Jens, Nick, any ideas? > Thanks for the numbers, interesting. Anticipatory basically tries pretty hard to control disk command queues because they can result in starvation... not exactly sure why it is _worse_ with NCQ than without, maybe the drive isn't too smart or there is a bad interaction with AS. I don't see any trivial bugs in AS that would cause this, but there may be one... It's unfortunate that we don't have a grand unified IO scheduler that does everything well (except perhaps noop functionality). It is something I guess Jens and I (or maybe someone completely different) should get together with and try to make progress on one day. -- Send instant messages to your online friends http://au.messenger.yahoo.com - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
