When it comes to ARM smartphone CPUs, they already incorporate big.LITTLE architecture, making hyper-threading somewhat redundant.
Hyper-threading enhances multi-thread performance at the cost of single-thread performance. Given that modern CPUs support instruction-level parallelism and multiple execution units, using idle execution units for additional threads can improve multi-threading capabilities. However, running a second thread competes for pipeline resources like instruction prefetch, decode, and dispatch, which can lower cache hit rates and negatively impact single-thread performance.
Common multi-threaded applications involve massive data processing and numerous service processes. In smartphones, massive data processing is rare, with video playback/recording being the primary example. However, mobile CPUs handle this through dedicated hardware rather than relying on the CPU.
While mobile devices do use multi-threading, especially for background tasks like network services and data processing, these tasks typically don’t demand high performance. Background services often run on smaller cores, which are sufficient for their needs. Instead of using hyper-threading to allocate idle execution units and risk reducing single-thread performance, it makes more sense to leverage available small cores directly.
In summary, for ARM CPUs designed with big.LITTLE architecture, hyper-threading is unnecessary and may degrade single-thread performance, making it an inefficient choice overall.
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