Hello, Kyle. On Sat, Oct 08, 2016 at 06:15:14PM -0700, Kyle Sanderson wrote: > How is this even a discussion when hard numbers, and trying any > reproduction case easily reproduce the issues that CFQ causes. Reading > this thread, and many others only grows not only my disappointment, > but whenever someone launches kterm or scrot and their machine > freezes, leaves a selective few individuals completely responsible for > this. Help those users, help yourself, help Linux. So, just to be clear. I wasn't arguing against bfq replacing cfq (or anything along that line) but that proportional control, as implemented, would be too costly for many use cases and thus we need something along the line of what Shaohua is proposing. FWIW, it looks like the only way we can implement proportional control on highspeed ssds with acceptable overhead is somehow finding a way to calculate the cost of each IO and throttle IOs according to that while controlling for latency as necessary. Slice scheduling with idling seems too expensive with highspeed devices with high io depth. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
