>>> On 19.09.12 at 12:51, Oliver Chick <oliver.ch...@citrix.com> wrote: > +/* > + * Maximum number of persistent grants that can be mapped by Dom0 for each > + * interface. This is set to be the size of the ring, as this is a limit on > + * the number of requests that can be inflight at any one time. 256 imposes > + * an overhead of 11MB of mapped kernel space per interface. > + */ > +#define BLKIF_MAX_PERS_REQUESTS_PER_DEV 256
How can this be a fixed number, especially in the context of ring size extensions? Iirc, single page rings can accommodate 64 requests, so I'd guess the number above was observed with a 4-page (order 2) ring... Jan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
