On Wed, Jul 21, 2021 at 10:23:38AM +0100, John Garry wrote: > On 21/07/2021 02:40, Ming Lei wrote: > > > I think that you should see a significant performance boost. > > There is build issue, please check your tree: > > > > MODPOST vmlinux.symvers > > MODINFO modules.builtin.modinfo > > GEN modules.builtin > > LD .tmp_vmlinux.btf > > ld: Unexpected GOT/PLT entries detected! > > ld: Unexpected run-time procedure linkages detected! > > ld: drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o: in function > > `smmu_test_store': > > /root/git/linux/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3892: undefined > > reference to `smmu_test_core' > > BTF .btf.vmlinux.bin.o > > pahole: .tmp_vmlinux.btf: No such file or directory > > LD .tmp_vmlinux.kallsyms1 > > .btf.vmlinux.bin.o: file not recognized: file format not recognized > > make: *** [Makefile:1177: vmlinux] Error 1 > > Ah, sorry. I had some test code which was not properly guarded with > necessary build switches. > > 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) [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) Thanks, Ming _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
