Re: Questions about alloc_large_system_hash() and TLB entries

[Eric Dumazet]

David S. Miller a écrit :
> From: Eric Dumazet <dada1@xxxxxxxxxxxxx>
> Date: Mon, 30 Jan 2006 10:03:40 +0100
>
> > What would be the needed changes in the code to get both :
> >
> >    - Allocate ram equally from all the nodes of the machine
> >
> >    - Use large pages (2MB) to lower TLB stress
>
> These two desires are mutually exclusive, I think.
>
> If you want an 8MB hash table, for example, with 2MB mappings
> you could use memory from a maximum of 4 nodes since the
> 2MB chunks have to be physically 2MB aligned and 2MB contiguous.

Yes of course, but as those hash tables are very big (their size is bigger 
than 2MB * number_of_nodes if you have at least 4GB per node), this could be 
done ?

Eric

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