With zonemode=zbd and regular block devices, fio initializes zone status as empty. However, write pointers are set not at zone start but at zone end. This inconsistency between write pointer position and zone status caused different behavior from zoned block devices. Fix the inconsistency by setting initial write pointer at zone start. Of note is that every fio run with zonemode=zbd and regular block devices starts with empty zones. Then read workloads just ends without any data to read. To run read workload, specify read_beyond_wp option. Or specify two jobs to a single fio command: write job to prepare data for read and read job which waits for the write job completion. Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxx> Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx> --- zbd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/zbd.c b/zbd.c index 8cf8f812..cf2cded9 100644 --- a/zbd.c +++ b/zbd.c @@ -381,7 +381,7 @@ static int init_zone_info(struct thread_data *td, struct fio_file *f) mutex_init_pshared_with_type(&p->mutex, PTHREAD_MUTEX_RECURSIVE); p->start = i * zone_size; - p->wp = p->start + zone_size; + p->wp = p->start; p->type = ZBD_ZONE_TYPE_SWR; p->cond = ZBD_ZONE_COND_EMPTY; } -- 2.26.2
