Re: [Xen-devel] [PATCH 0/6] grantable and address conversion patches

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 10 Apr 2006, at 09:54, Keir Fraser wrote:

> 2/6: This is a poor fix. Either we should make the ring size fixed 
> (e.g., 4kB) rather than architectural page-sized, or grants should be 
> dynamically allocated in netfront rather than statically allocated. 
> This was done quite some time ago for blkfront, and would be the 
> preferred (although more difficult) fix here.
Actually, another option that might be easier that dynamic grant 
allocation, but less restrictive that reducing the size of the rings on 
ia64, would be to modify netfront to queue only up to 256 requests 
simultaneously on any ring, regardless of the actual ring size. Then 
you'd only need to allocate 256 grants per ring, as x86, and the bigger 
issue (dynamic allocation of grants) can be fixed later. At that point 
we can lift the restriction of 256 requests per ring without having to 
change the public interface at all (unlike if we'd reduced the 
advertised ring size for ia64).
 -- Keir


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