On Wed, Jul 21, 2021 at 12:07:22PM +0100, John Garry wrote:

On 21/07/2021 10:59, Ming Lei wrote:

quoted

quoted

I have now removed that from the tree, so please re-pull.

Now the kernel can be built successfully, but not see obvious improvement
on the reported issue:

[root@ampere-mtjade-04 ~]# uname -a
Linux ampere-mtjade-04.khw4.lab.eng.bos.redhat.com 5.14.0-rc2_smmu_fix+ #2 SMP Wed Jul 21 05:49:03 EDT 2021 aarch64 aarch64 aarch64 GNU/Linux

[root@ampere-mtjade-04 ~]# taskset -c 0 ~/git/tools/test/nvme/io_uring 10 1 /dev/nvme1n1 4k
+ fio --bs=4k --ioengine=io_uring --fixedbufs --registerfiles --hipri --iodepth=64 --iodepth_batch_submit=16 --iodepth_batch_complete_min=16 --filename=/dev/nvme1n1 --direct=1 --runtime=10 --numjobs=1 --rw=randread --name=test --group_reporting
test: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=64
fio-3.27
Starting 1 process
Jobs: 1 (f=1): [r(1)][100.0%][r=1503MiB/s][r=385k IOPS][eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=3143: Wed Jul 21 05:58:14 2021
   read: IOPS=384k, BW=1501MiB/s (1573MB/s)(14.7GiB/10001msec)

I am not sure what baseline you used previously, but you were getting 327K
then, so at least this would be an improvement.

Yeah, that might be one improvement, but not checked it since code base
is changed.

quoted

[root@ampere-mtjade-04 ~]# taskset -c 80 ~/git/tools/test/nvme/io_uring 10 1 /dev/nvme1n1 4k
+ fio --bs=4k --ioengine=io_uring --fixedbufs --registerfiles --hipri --iodepth=64 --iodepth_batch_submit=16 --iodepth_batch_complete_min=16 --filename=/dev/nvme1n1 --direct=1 --runtime=10 --numjobs=1 --rw=randread --name=test --group_reporting
test: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=64
fio-3.27
Starting 1 process
Jobs: 1 (f=1): [r(1)][100.0%][r=138MiB/s][r=35.4k IOPS][eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=3063: Wed Jul 21 05:55:31 2021
   read: IOPS=35.4k, BW=138MiB/s (145MB/s)(1383MiB/10001msec)

I can try similar on our arm64 board when I get a chance.

The issue I reported is this one.

Thanks,
Ming


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