I am testing a passtrhough gpu performance by measuring device to host & host to device memory copy bandwidth. The tested GPU is nvidia t4. The benchmarking script I am using is https://developer.nvidia.com/blog/how-optimize-data-transfers-cuda-cc/.
On the baremetal machine, the result is
in the virtual machine, the result is,
My question is what could be the reason for the degradation and is there anything I can do to improve it? Thank you very much for the help.
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Best Regards,
Jiatong Shen