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AMD 禁用了 Zen4 处理器的循环缓冲区

2024-12-01 22:25 by 量子之夜

Chips and Cheese 报道,AMD 近期释出的固件被发现禁用了 Zen4 处理器的循环缓冲区(loop buffer),AMD 对此未给出任何解释。循环缓冲区位于 CPU 前端,用于保存部分已获取指令。小循环可完全包含在循环缓冲区内,可在关闭部分前端阶段的情况下执行。此举有助于省电,还能通过绕过前端阶段的部分限制以改进性能。根据 Zen4 的处理器编程参考,它包含了循环缓冲区,但近期释出的固件将其禁用了。测试显示,Zen4 禁用和启用循环缓冲区对性能基本没有什么影响。Chips and Cheese 作者猜测,Zen4 已进入寿命后期,AMD 这个时候去改变 CPU 前端可能是因为其内部发现了 bug,出于谨慎考虑而决定将其禁用。

https://chipsandcheese.com/p/amd-disables-zen-4s-loop-buffer

#AMD



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AMD 禁用了 Zen4 处理器的循环缓冲区

2024-12-01 22:25 by 量子之夜

Chips and Cheese 报道,AMD 近期释出的固件被发现禁用了 Zen4 处理器的循环缓冲区(loop buffer),AMD 对此未给出任何解释。循环缓冲区位于 CPU 前端,用于保存部分已获取指令。小循环可完全包含在循环缓冲区内,可在关闭部分前端阶段的情况下执行。此举有助于省电,还能通过绕过前端阶段的部分限制以改进性能。根据 Zen4 的处理器编程参考,它包含了循环缓冲区,但近期释出的固件将其禁用了。测试显示,Zen4 禁用和启用循环缓冲区对性能基本没有什么影响。Chips and Cheese 作者猜测,Zen4 已进入寿命后期,AMD 这个时候去改变 CPU 前端可能是因为其内部发现了 bug,出于谨慎考虑而决定将其禁用。

https://chipsandcheese.com/p/amd-disables-zen-4s-loop-buffer

#AMD

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