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    SubjectRe: [REPORT] cfs-v4 vs sd-0.44
    Date
    On Tuesday 24 April 2007, Ingo Molnar wrote:
    >* Gene Heskett <gene.heskett@gmail.com> wrote:
    >> > Gene has done some testing under CFS with X reniced to +10 and the
    >> > desktop still worked smoothly for him.
    >>
    >> As a data point here, and probably nothing to do with X, but I did
    >> manage to lock it up, solid, reset button time tonight, by wanting
    >> 'smart' to get done with an update session after amanda had started.
    >> I took both smart processes I could see in htop all the way to -19,
    >> but when it was about done about 3 minutes later, everything came to
    >> an instant, frozen, reset button required lockup. I should have
    >> stopped at -17 I guess. :(
    >
    >yeah, i guess this has little to do with X. I think in your scenario it
    >might have been smarter to either stop, or to renice the workloads that
    >took away CPU power from others to _positive_ nice levels. Negative nice
    >levels can indeed be dangerous.
    >
    >(Btw., to protect against such mishaps in the future i have changed the
    >SysRq-N [SysRq-Nice] implementation in my tree to not only change
    >real-time tasks to SCHED_OTHER, but to also renice negative nice levels
    >back to 0 - this will show up in -v6. That way you'd only have had to
    >hit SysRq-N to get the system out of the wedge.)
    >
    > Ingo

    That sounds handy, particularly with idiots like me at the wheel...


    --
    Cheers, Gene
    "There are four boxes to be used in defense of liberty:
    soap, ballot, jury, and ammo. Please use in that order."
    -Ed Howdershelt (Author)
    When a Banker jumps out of a window, jump after him--that's where the money
    is.
    -- Robespierre
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