从消除信号阻塞到进程执行下一个指令之间，必然会有时钟周期间隙，任何在此时间窗口发生的信号都会丢掉。

There has to be some gap of clock cycles between the unblocking of signals and the next instruction carried by the process, and any occurrence of a signal in this window of time is lost.

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POWER 5芯片有两个硬件指令线程，在每个周期都能够执行多个指令，这可以提高性能。

The POWER5 chip has two hardware instruction threads that are both capable of issuing multiple instructions per cycle, which causes a boost in performance.

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SPU本身使用向量操作，每个时钟周期可以执行多达8条浮点指令。

An SPU USES vector operations itself and can thereby execute up to eight floating point instructions per clock cycle.

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