[lkml]   [2007]   [Jun]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [BUG] long freezes on thinkpad t60

    * Linus Torvalds <> wrote:

    > No, the cache line arbitration doesn't know anything about "locked" vs
    > "unlocked" instructions (it could, but there really is no point).
    > The real issue is that locked instructions on x86 are serializing,
    > which makes them extremely slow (compared to just a write), and then
    > by being slow they effectively just make the window for another core
    > bigger.
    > IOW, it doesn't "fix" anything, it just hides the bug with timing.

    yeah. I think Linux is i think the only OS on the planet that is using
    the movb trick for unlock, it even triggered a hardware erratum ;) So it
    might surprise some hw makers who might rely on the heuristics that each
    critical section lock and unlock is a LOCK-ed instruction.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-06-21 22:21    [W:0.036 / U:31.776 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site