Messages in this thread |  | | | Date | Mon, 28 May 2012 23:34:34 -0400 | | From | Kent Overstreet <> | | Subject | Re: [PATCH v3 14/16] Gut bio_add_page() |
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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.
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