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    SubjectRe: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets - bisected
    > Yes, postgress performs loads better with it's spinlocks, but due to
    > that, it necessarily _hates_ preemption. How the is the scheduler
    > supposed to know that any specific userland task _really_ shouldn't be
    > preempted at any specific time, else bad things follow?

    You provide a shared page for a process group so it can write hints to
    which is kernel mapped so the scheduler can peek..


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      Last update: 2012-09-16 00:21    [W:0.027 / U:39.244 seconds]
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