On Wed, May 27, 2015 at 01:40:22AM +0100, Alasdair G Kergon wrote: > It does sometimes make a significant difference to device-mapper stacks. > DM only uses it for performance reasons - it can already split bios when > it needs to. I tried to remove merge_bvec_fn from DM several years ago but > couldn't because of the adverse performance impact of lots of splitting > activity.
Does it still? Since the move to immutable biovecs the bio splits are pretty cheap now, but I'd really like to see this verified by benchmarks. -- 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/
