On Thu, Jan 21, 2016 at 08:15:37PM -0800, Linus Torvalds wrote: > For the case of nvme, for example, I think the max sector number is so > high that you'll never hit that anyway, and you'll only ever hit the > chunk limit. No? The device's max transfer and chunk size are not very large, both fixed at 128KB. We can lose ~70% of potential throughput when IO isn't aligned, and end users reported this when the block layer stopped splitting on alignment for the NVMe drive. So it's a big deal for this h/w, but now I feel awkward defending a device specific feature for the generic block layer. Anyway, the patch was developed with incorrect assumptions. I'd still like to try again after reconciling the queue limit constraints, but I defer to Jens for the near term. Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
