Re: [Xen-devel] event TRC_MEM_PAGE_GRANT_TRANSFER

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 23/1/07 19:31, "Rob Gardner" <rob.gardner@xxxxxx> wrote:

>> 
>> Grant transfers are no longer used to move network data from netback to
>> netfront (except for backward compatibility with old netfront drivers).
> 
> 
> Yeah, got that. ;)  Could you explain what mechanisms are currently used
> to move data for net I/O and disk I/O between domains, and in
> particular, can you suggest where in the code I could put trace calls to
> be able to count I/O's? Thanks.

Everything is done via grant-map/unmap commands as it always was, except
network receive (netback->netfront) which is done via grant-copy commands
(one per contiguous fragment of network packet).

 -- Keir


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