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
