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[OLK-5.10] iommu: set the default iommu-dma mode as non-strict

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2021-11-29 10:17
Currently, many peripherals are faster than before. For example, the top
speed of the older netcard is 10Gb/s, and now it's more than 25Gb/s. But
when iommu page-table mapping enabled, it's hard to reach the top speed
in strict mode, because of frequently map and unmap operations. In order
to keep abreast of the times, I think it's better to set non-strict as
default.

Below it's our iperf performance data of 25Gb netcard:
strict mode: 18-20 Gb/s
non-strict mode: 23.5 Gb/s

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wupeng created任务
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Hi hw-wupeng, welcome to the openEuler Community.
I'm the Bot here serving you. You can find the instructions on how to interact with me at
https://gitee.com/openeuler/community/blob/master/en/sig-infrastructure/command.md.
If you have any questions, please contact the SIG: Kernel, and any of the maintainers: @XieXiuQi , @YangYingliang , @成坚 (CHENG Jian) .

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