>>> On 18.12.15 at 11:06, wrote:
> --- a/xen/include/xen/grant_table.h
> +++ b/xen/include/xen/grant_table.h
> @@ -51,13 +51,35 @@
> /* The maximum size of a grant table. */
> extern unsigned int max_grant_frames;
>
> +DECLARE_PERCPU_RWLOCK_GLOBAL(grant_rwlock);
> +
> +static inline void grant
The per domain grant table read lock suffers from significant contention when
performance multi-queue block or network IO due to the parallel
grant map/unmaps/copies occurring on the DomU's grant table.
On multi-socket systems, the contention results in the locked compare swap
operation failing fr
