On Wed, Jun 11, 2014 at 10:54:52AM -0600, Jens Axboe wrote: > OK, so essentially any single request must be a virtually contig piece > of memory. Is there any size limitations to how big this contig segment > can be?
The maximum size of an I/O is 65536 sectors. So on a 512-byte sector device, that's 32MB, but on a 4k sector size device, that's 128MB. > I think this is unique requirement, at least I haven't seen other pieces > of hardware have it. But it would be pretty trivial to add a setting to > limit merges based on virtually contig, similarly to what is done for > number of physical segments. I think there might be an FCoE device with that requirement too. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
