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    SubjectRe: 'autogroup' sched code KILLING responsiveness
    On Fri, 21 Jan 2011 at 10:20, Michael Witten wrote:
    > With that code in place, a resource-intensive activity (such as
    > compiling the Linux kernel) causes my computer to become
    > unresponsive for many seconds at a time; the entire screen
    > does not refresh, typed keys are dropped or are handled very
    > late, etc (even in Linux's plain virtual consoles).

    Unfortunately, I'd like to add a "me too". 2.6.38-rc1 behaves fine, but
    with CONFIG_SCHED_AUTOGROUP=y and doing I/O and CPU intensive work (git
    prune/git repack on a Linux git tree), system load goes up to ~13 and
    becomes unresponse for some time too. This even happens when I start the
    jobs with nice -n10.

    Without CONFIG_SCHED_AUTOGROUP enabled and doing the same work,
    systemload goes up to 1 or maybe 2.

    I'm on UP as well (PowerPC G4), disabling CONFIG_SCHED_AUTOGROUP helps
    here too.

    Thanks,
    Christian.
    --
    BOFH excuse #274:

    It was OK before you touched it.


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