On 23/07/2021 11:21, Ming Lei wrote:
Thanks, I was also going to suggest the latter, since it's what
arm_smmu_cmdq_issue_cmdlist() does with IRQs masked that should be most
indicative of where the slowness most likely stems from.
The improvement from 'iommu.strict=0' is very small:
Have you tried turning off the IOMMU to ensure that this is really just
an IOMMU problem?
You can try setting CONFIG_ARM_SMMU_V3=n in the defconfig or passing
cmdline param iommu.passthrough=1 to bypass the the SMMU (equivalent to
disabling for kernel drivers).
Thanks,
John
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