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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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