Hi, In the latest kernel 4.10 there has been support added for NCQ Priority commands. I can test this functionality by using the option prioclass=1 as in the following FIO script (100% RR) and I can see that the prio bit is set on the 8k RR commands, but not the 64k RR (expected). [global] direct=1 filename=/dev/sdb runtime=2m ioengine=libaio norandommap [High-Prio-8kRR-q8] prioclass=1 iodepth=8 rw=randread bs=8k [Low-Prio-64kRR-q8] prioclass=0 iodepth=8 rw=randread bs=64k Would it be possible to add something in FIO that would give finer control over the split of high priority commands to low priority? Ideally I would like to be able to test something like: 60% RandomRead / 40% RandomWrite but of those reads, have 15% be high priority Or is there a way to get this sort of priority testing done with current FIO? Regards, Brandon -- 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
