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L1d Flushing Patches Revived After It Was Rejected From Linux 5.8 As "Beyond Stupid"

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  • #31
    Originally posted by DanL View Post

    I don't think they care about that specifically, especially gamers. It's about performance/price. In other words, if CPU A outperforms CPU B at a given price, CPU A wins, even if it has some mitigations that B doesn't. Few people are going to buy CPU B just based on the "principle" that it doesn't have mitigations, or care if CPU A could be 0.5% faster without them.
    Mitigations affect or not the performance of the CPUs affected by vulnerabilities?

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    • #32
      Originally posted by Azrael5 View Post
      Mitigations affect or not the performance of the CPUs affected by vulnerabilities?
      Yes, and I didn't claim otherwise. What is your point?

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      • #33
        Originally posted by Danny3 View Post

        WTF. This is by default and I have to opt-out ?
        This is indeed beyond stupid!
        Well it doesn't happen automatically for every single process. It's more like any arbitrary process can tell the kernel to do this for that particular process, and it won't affect other processes.

        Problem is, due to that one process performing flushing, performance of the system might suffer as a whole, which is bad.

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