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Re: NetBSD 5.1 TCP performance issue (lots of ACK)

On Sat, Oct 29, 2011 at 10:02:10PM +0200, Manuel Bouyer wrote:
> OK, I see. But, is there a platoform where BUS_DMASYNC_PREREAD is not
> a NOP ? I can't what kind of work BUS_DMASYNC_PREREAD could have to do ...

On platforms with memory reordering it might be a barrier (i.e. sparc64 does
a membar_sync() for it).


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