A group of academic researchers have published a paper describing the first side-channel attack targeting the scheduler queues of modern processors.
Contention, or the conflict between multiple threads attempting to use the same resource, is what some of these attacks base their analysis on. The execution schedule of the instructions is determined by scheduler queues in superscalar processors.
While Apple and AMD chips have separate scheduler queues for each execution unit, Intel CPUs only have one scheduler queue. Additionally, AMD processors support simultaneous multithreading (SMT), which divides a CPU core into multiple logical cores or hardware threads that each carry out a separate stream of instructions.
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