lkml.org 
[lkml]   [2007]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: allow non root users to set io priority "idle" ?
    Andi Kleen wrote:
    >> couldn't this be fixed by bumping idle tasks to middle while they hold a
    >>
    >
    > Usually to high.
    >
    > But it's all complicated and hasn't been done consistently
    > (there are real time mutexes in the -rt kernel for example,
    > but there are lots of other locks and they have higher overhead too)
    > and it's unclear we really want to do all this complexity anyways.
    >
    > Also as I said the problem could then still happen in user space
    > which then would all need to be fixed to handle PI too.
    >
    > In some cases the relationship is also not as simple as a single
    > lock. And for IO handling it would be likely quite hard.
    >
    > I personally always found idle priorities quite dubious because
    > even if they worked reliable for the CPU they will clear your cache/
    > load your memory controller and impact all other programs because
    > of this. And for the disk they will cause additional seeks which are
    > also very costly.
    >
    >
    ok, thx so that means that the best that can be done for now is to run
    beagle as best effort with prio 7 (like its done now).


    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-08-06 13:11    [W:0.020 / U:23.912 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site