On Fri, Dec 05 2014 at 12:27pm -0500, Jens Axboe <axboe@xxxxxxxxx> wrote: > On 12/04/2014 08:33 AM, Mike Snitzer wrote: > > > >Here is a revised patch that is more like I'd expect to land upstream. > >Jens are you OK with us adding bio_is_zero_filled to block/bio.c? If so > >should I split it out as a separate patch for you to pick up or just > >carry it as part of the patch that lands in linux-dm.git? > > Yeah I'm fine with adding that helper. Good to know, thanks. > I do wonder what the performance impact is on this for dm. Have you > tried a (worst case) test of writing blocks that are zero filled, but > with the last byte not being a zero? I haven't tested that yet, but I share your concern. Does fio offer the ability to slap down a specific pattern like this? If not is there a logical place to extend fio to enable this? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
