On 7/10/18 12:49 PM, Bart Van Assche wrote: > On Tue, 2018-07-10 at 12:45 -0600, Jens Axboe wrote: >> The difference between the job file and the >> workload run can be huge. Consider something really basic: >> >> [randwrites] >> bs=4k >> rw=randwrite >> >> which would be 100% random 4k writes. If I run this on a zoned device, >> then that'd turn into 100% sequential writes. > > That's not correct. The ZBD code in the github pull request serializes writes > per zone, not globally. That's a totally minor detail. If all my random writes fall within a single zone, then they'd be 100% sequential. For N open zones, you'd be 100% sequential within the zone. The point is that the workload as defined and the workload as run are two totally different things, and THAT is the problem. -- Jens Axboe
