On Tue, Apr 28, 2015 at 10:31 AM, Alasdair G Kergon <agk@xxxxxxxxxx> wrote: > On Mon, Apr 27, 2015 at 11:48:34PM -0700, Ming Lin wrote: >> As generic_make_request() is now able to handle arbitrarily sized bios, >> it's no longer necessary for each individual block driver to define its >> own ->merge_bvec_fn() callback. Remove every invocation completely. > > merge_bvec_fn is also about telling the code building up bios what optimum > maximum size to use. > > Have you got some test data to demonstrate that we won't find some situations > where performance is now lost by code building up bios that are far too big > and are always going to have to be split up later? Not yet. Fengguang will help to run some tests. Thanks. > > Alasdair > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
