Re: [LSF/MM/BPF TOPIC] Improving Zoned Storage Support

Jens Axboe
2024-01-18T00:42:50Z

On 1/17/24 5:38 PM, Bart Van Assche wrote:
> On 1/17/24 10:43, Jens Axboe wrote:
>> Do we care? Maybe not, if we accept that an IO scheduler is just for
>> "slower devices". But let's not go around spouting some 200K number as
>> if it's gospel, when it depends on so many factors like IO workload,
>> system used, etc.
> I've never seen more than 200K IOPS in a single-threaded test. Since
> your tests report higher IOPS numbers, I assume that you are submitting
> I/O from multiple CPU cores at the same time.

Single core, using mq-deadline (with the poc patch, but number without
you can already find in a previous reply):

axboe@7950x ~/g/fio (master)> cat /sys/block/nvme0n1/queue/scheduler
none [mq-deadline]
axboe@7950x ~/g/fio (master)> sudo t/io_uring -p1 -d128 -b512 -s32 -c32 -F1 -B1 -R1 -X1 -n1 /dev/nvme0n1

submitter=0, tid=1957, file=/dev/nvme0n1, node=-1
polled=1, fixedbufs=1/0, register_files=1, buffered=0, QD=128
Engine=io_uring, sq_ring=128, cq_ring=128
IOPS=5.10M, BW=2.49GiB/s, IOS/call=32/31
IOPS=5.10M, BW=2.49GiB/s, IOS/call=32/32
IOPS=5.10M, BW=2.49GiB/s, IOS/call=31/31

Using non-polled IO, the number is around 4M.

--
Jens Axboe