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When utilizing the ib_write_bw tool for performance testing, what does the -S flag define?
Correct Answer: D
FromNVIDIA Performance Tuning Guide (ib_write_bw Tool Usage): "-S <SL>: Specifies the Service Level (SL) to use for the InfiniBand traffic. SL is used for setting priority and mapping to virtual lanes (VLs) on the IB fabric." This flag is useful when testing QoS-aware setups or validating SL/VL mappings. Incorrect Options: * A- No such flag for burst size. * B- -q defines number of QPs. * C- --rate or -R is used for rate-limiting. Reference: NVIDIA InfiniBand Performance Guide - ib_write_bw Options Section