On 6/27/22 16:43, Bart Van Assche wrote:
> Add a new configfs attribute for enabling pipelining of zoned writes. If
> that attribute has been set, retry zoned writes that are not aligned with
> the write pointer. The test script below reports 244 K IOPS with no I/O
> scheduler, 5.79 K IOPS with mq-deadline and pipelining disabled and 79.6 K
> IOPS with mq-deadline and pipelining enabled. This shows that pipelining
> results in about 14 times more IOPS for this particular test case.
>
> #!/bin/bash
>
> for mode in "none 0" "mq-deadline 0" "mq-deadline 1"; do
> set +e
> for d in /sys/kernel/config/nullb/*; do
> [ -d "$d" ] && rmdir "$d"
> done
> modprobe -r null_blk
> set -e
> read -r iosched pipelining <<<"$mode"
> modprobe null_blk nr_devices=0
> (
> cd /sys/kernel/config/nullb
> mkdir nullb0
> cd nullb0
> params=(
> completion_nsec=100000
> hw_queue_depth=64
> irqmode=2 # NULL_IRQ_TIMER
> max_sectors=$((4096/512))
> memory_backed=1
> pipeline_zoned_writes="${pipelining}"
> size=1
> submit_queues=1
> zone_size=1
> zoned=1
> power=1
> )
> for p in "${params[@]}"; do
> echo "${p//*=}" > "${p//=*}"
> done
> )
> udevadm settle
> dev=/dev/nullb0
> [ -b "${dev}" ]
> params=(
> --direct=1
> --filename="${dev}"
> --iodepth=64
> --iodepth_batch=16
> --ioengine=io_uring
> --ioscheduler="${iosched}"
> --gtod_reduce=1
> --hipri=0
> --name=nullb0
> --runtime=30
> --rw=write
> --time_based=1
> --zonemode=zbd
> )
> fio "${params[@]}"
> done
>
Is it possible to move this into the blktests ?
-ck
