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    SubjectRe: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node
    On Mon, Jul 19, 2021 at 05:14:28PM +0100, John Garry wrote:
    > On 09/07/2021 15:24, Ming Lei wrote:
    > > > associated compromises.
    > > Follows the log of 'perf report'
    > >
    > > 1) good(run fio from cpus in the nvme's numa node)
    >
    > Hi Ming,
    >
    > If you're still interested in this issue, as an experiment only you can try
    > my rebased patches here:
    >
    > https://github.com/hisilicon/kernel-dev/commits/private-topic-smmu-5.14-cmdq-4
    >
    > 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


    Thanks,
    Ming

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