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    SubjectRe: [PATCH] SLUB: revert direct page allocator pass through
    On Sat, 2009-01-24 at 02:37 +1100, Nick Piggin wrote:
    > On Saturday 24 January 2009 02:27:29 Christoph Lameter wrote:
    > > On Sat, 24 Jan 2009, Nick Piggin wrote:
    > > > > I thought higher order allocations were not supposed to be used in
    > > > > performance critical paths?
    > > >
    > > > ? You use them all the time in SLUB alone.
    > >
    > > But SLUB compensates for the slow higher order allocs by using them as
    > > buffers for smaller objects.. The higher order allocs are in the slow
    > > paths.
    > I don't quite know what you're asking of me. If you see higher order
    > allocations in performance critical code, then you answer your own
    > question?
    > However, I don't know if netperf udp 4K over loopback is totally
    > realistic. Maybe real network drivers have different allocation patterns.
    Client/server model and distributed systems are popular. To be flexible,
    these applications mostly can be configured in one machine, or in a group of
    machines. If in one machine, they are used to communicate with network loopback.
    I once touched a big distributed telecom application which use UDP to communicate
    between front-end and back-end. If they merge front-end and back-end to one machine
    based on some customers' requirements to reduce cost, that will be an example.

    > If I were you I wouldn't be too hasty to make big changes based on that
    > alone, if it could introduce regression in somewhere more important.

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