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    SubjectRe: [RFC PATCH] kick ksoftirqd more often to please soft lockup detector
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    On Wed, Feb 29, 2012 at 1:17 AM, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
    > On Tue, 2012-02-28 at 14:16 -0800, Dan Williams wrote:
    >> Looks like everyone is guilty:
    >>
    >> [  422.765336] softirq took longer than 1/4 tick: 3 NET_RX ffffffff813f0aa0
    >> ...
    >> [  423.971878] softirq took longer than 1/4 tick: 4 BLOCK ffffffff812519c8
    >> [  423.985093] softirq took longer than 1/4 tick: 6 TASKLET ffffffff8103422e
    >> [  423.993157] softirq took longer than 1/4 tick: 7 SCHED ffffffff8105e2e1
    >> [  424.001018] softirq took longer than 1/4 tick: 9 RCU ffffffff810a0fed
    >> [  424.008691] softirq loop took longer than 1/2 tick need_resched:
    >
    > /me kicks himself for not printing the actual duration.. :-)
    >
    >> As expected whenever that 1/2 tick message gets emitted the softirq
    >> handler is almost running in a need_resched() context.
    >
    > Yeah.. that's quite expected.
    >
    >> So is it a good idea to get more aggressive about scheduling ksoftrrqd?
    >
    > Nah, moving away from softirq more like. I'll put moving the
    > load-balancer into a kthread on the todo list. And it looks like
    > everybody else should move to kthreads too.

    I seem to recall this running into resistance (but maybe things have
    changed in the last few years)?

    https://lkml.org/lkml/2007/6/29/155
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