Re: [PATCH] tcpdump -s 0 improvement

[Guy Harris <guy () alum mit edu>]

On Nov 30, 2011, at 2:18 PM, Michael Richardson wrote:

> I was under the impression that some of hte ring-buffer mechanisms need
> packets to be aligned on MMU-sized boundaries so that the kernel can
> play page-swapping games, rather than copying data.

I don't think it does page-flipping - it just maps the whole thing when it starts up - and it allocates real 
(wired-down) pages to back the address space.  It allocates a bunch of contiguous pages, which is why they're aligned 
on page boundaries.-
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