Hello, On Thu, Jan 5, 2012 at 8:15 PM, Shaohua Li <shaohua.li@xxxxxxxxx> wrote: > don't know. I don't think a tweak for merge impacts isolation so much. > For rotate disk, request size hasn't impact to request cost, so this > doesn't impact isolation. Even for ssd, big size request is more > efficient to dispatch. And we already have breakage of fairness for SSD, > such as no idle. I'm not saying they shouldn't be merged but the decision should be elevator's. Block core shouldn't decide it for the elevator. So, whether cross cfqq merge is a good idea or not is mostly irrelevant in this thread. Thanks. -- tejun -- To unsubscribe from this list: 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
