On Tue, May 29, 2012 at 11:54:38AM +1000, Dave Chinner wrote: > It also allowed us to build IOs that span > entire RAID stripe widths, thereby avoiding potential RAID RMW > cycles, and even allowing high end raid controllers to trigger BBWC > bypass fast paths that could double or triple the write throughput > of the arrays... merge_bvec_fn has nothing to do with that though, since for one there aren't any merge_bvec_fn's being called in the IO paths on these high end disk arrays, and for our software raid implementations their merge_bvec_fns will keep you from sending them bios that span entire stripes. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
