I think the 1k bucket statement was referring to the sort order. That bucket represents about 1 to 2 microseconds, which is dubiously fast. Maybe this is possib

I think the 1k bucket statement was referring to the sort order. That bucket represents about 1 to 2 microseconds, which is dubiously fast. Maybe this is possible if the IO is serviced by DRAM on the NVMe controller. Maybe the IOs in question completed without going to the drive, such as in some error condition. There are also a bunch of IOs in the 0 bucket. I’m not sure how you make it from sdstrategy to sd_buf_done with the passage of no time. Perhaps the granularity if the nsecs variable’s values is rather coarse.