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    SubjectRe: iptables very slow after commit 784544739a25c30637397ace5489eeb6e15d7d49
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    From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
    Date: Sun, 12 Apr 2009 10:31:08 -0700

    > On Sun, Apr 12, 2009 at 09:34:27PM +1000, Paul Mackerras wrote:
    >> Paul E. McKenney writes:
    >>
    >> > If the generic implementation is needed only on !SMP systems, that
    >> > could work. The architectures I would be worried about include
    >> > powerpc and ia64, which I believe support 32-bit SMP builds.
    >>
    >> 32-bit powerpc doesn't have 64-bit atomic operations and does support
    >> SMP.
    >>
    >> What about ARM? I thought they had 32-bit SMP these days as well.
    >
    > Some of Steve Hemminger's recent suggestions in this thread seem to me
    > to avoid this whole issue nicely. But we will see! ;-)

    I hope so.

    Eventually it seems that all of the older 32-bit SMP platforms
    will be run under a bus having to execute some many "efficient"
    primitives using the "hash table of spinlocks" scheme for
    synchronization.


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