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Want A More Secure Computer At The Cost Of Performance? Linux 5.8 Landing L1d Flushing

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  • Want A More Secure Computer At The Cost Of Performance? Linux 5.8 Landing L1d Flushing

    Phoronix: Want A More Secure Computer At The Cost Of Performance? Linux 5.8 Landing L1d Flushing

    For those very concerned about CPU data sampling vulnerabilities, the Linux 5.8 kernel comes with the ability to flush the L1 data cache on each context switch. That's good for security, but will hurt the system performance with all the excess L1 cache flushing...

    http://www.phoronix.com/scan.php?pag...n-L1d-Flushing

  • #2
    Somebody please implement L1CI (level 1 cache isolation) already...

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    • #3
      ...masochists

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      • #4
        Typo:

        Originally posted by phoronix View Post
        due to recent snoop assisted data sampling vulnerabilites or the cache

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        • #5
          OK, Why am I saying this again, instead of a flush, why not preload, and GAIN performance ? ...

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          • #6
            Originally posted by tchiwam View Post
            OK, Why am I saying this again, instead of a flush, why not preload, and GAIN performance ? ...
            Mr. Dunning? Mr. Kruger? Anybody knows?

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            • #7
              Originally posted by lkundrak View Post

              Mr. Dunning? Mr. Kruger? Anybody knows?
              No offense taken...

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              • #8
                Originally posted by tchiwam View Post
                OK, Why am I saying this again, instead of a flush, why not preload, and GAIN performance ? ...
                Write dirty only lines to memory is much faster then read full size of L1 cache from it.

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                • #9
                  as offline gang can i disable this useless patch ?

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                  • #10
                    lol out of context, seeing a photo of a CPU in front of a toilet would be the weirdest way to promote it.

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