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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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On Feb. 27, however, he admitted from his Russian-language account that "Telegram channels are increasingly becoming a source of unverified information related to Ukrainian events." The regulator said it had received information that messages containing stock tips and other investment advice with respect to selected listed companies are being widely circulated through websites and social media platforms such as Telegram, Facebook, WhatsApp and Instagram. The original Telegram channel has expanded into a web of accounts for different locations, including specific pages made for individual Russian cities. There's also an English-language website, which states it is owned by the people who run the Telegram channels. At its heart, Telegram is little more than a messaging app like WhatsApp or Signal. But it also offers open channels that enable a single user, or a group of users, to communicate with large numbers in a method similar to a Twitter account. This has proven to be both a blessing and a curse for Telegram and its users, since these channels can be used for both good and ill. Right now, as Wired reports, the app is a key way for Ukrainians to receive updates from the government during the invasion. Just days after Russia invaded Ukraine, Durov wrote that Telegram was "increasingly becoming a source of unverified information," and he worried about the app being used to "incite ethnic hatred."
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