[Xen-ia64-devel] Re: Preliminary work on networking code

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 5 Dec 2005, at 23:47, Magenheimer, Dan (HP Labs Fort Collins) wrote:

> The comms ring seems to require two consecutive pages,
> one for xmit and one for rcv.  Both are obtained via
> map_grant_ref.  However map_grant_ref on ia64 may
> choose (like mmap) to return an address different than
> the one requested.  If it does, I think the existing
> netif code will break badly.  Are there two pages mapped
> because PAGE_SIZE=4K on x86?  In other words, would one
> 16K page be sufficient for ia64?  Or do the two pages
> potentially have different attributes and thus must really
> be separate pages?
No, they can reside on the same 16kB page. The pages are not 
consecutive on x86 -- they are two arbitrary pages.
 -- Keir


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