Hi, Tejun Since your NCQ patches were pushed into #upstream, I decide to compare the performance between with and without NCQ enabling. But initial test result of running iozone with O_DIRECT option turned on didn't show the visible performance gain with NCQ. In certain cases, NCQ even had a worse performance than without NCQ. So my question is in what usage case can we observe the performance gain with NCQ? Thanks, Forrest - : 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