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    SubjectRe: [PATCH RFC] v1 expedited "big hammer" RCU grace periods
    On Thu, Apr 23, 2009 at 08:47:02AM -0700, Linus Torvalds wrote:
    >
    >
    > On Thu, 23 Apr 2009, Paul E. McKenney wrote:
    > >
    > > Hmmm... I need to ask Jeff Chua what HZ he was running with. Because if
    > > there was some read-side critical section soaking up 30 milliseconds,
    > > all that hammering will do is slow things down...
    >
    > The original bug report comes from simply bootup:
    >
    > "I'm loading all the firewall rules during boot-up and this 6 secs
    > slowness is really not very nice to wait for."
    >
    > IOW, the problematic case likely effectively has _nothing_ else going on.
    > Sure, there might be some parallelism (the bootup scripts are getting
    > better for that), but hopefully not 6 seconds worth, and not likely any
    > complex critical sections.

    Sounds good to me! ;-)

    Thanx, Paul


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