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    SubjectRe: rcu stalls and soft lockups with recent kernels
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    On Wed, 2016-03-16 at 12:15 -0400, Ion Badulescu wrote:
    > Just following up to my own email:
    >
    > It turns out that we can eliminate the RCU stalls by changing from
    > CONFIG_RCU_NOCB_CPU_ALL to CONFIG_RCU_NOCB_CPU_NONE. Letting each cpu
    > handle its own RCU callbacks completely fixes the problems for us.
    >
    > Now, CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU_ALL is the default config
    > for fedora and rhel7. Ho-humm...

    All RCU offloaded to CPU0 of a big box seems like a very bad idea.

    -Mike

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