On Thu, Mar 21, 2024 at 04:50:44PM -0600, Jens Axboe wrote: > On 3/21/24 4:09 PM, Christoph Hellwig wrote: > > On Thu, Mar 21, 2024 at 11:09:25AM -0600, Jens Axboe wrote: > >> Where is this IO coming from? The normal block level dio has checks. And > >> in fact they are expensive... > > > > How is this expensive when we need the bio cache lines all the time > > during I/O submission which follows instantly? > > This part isn't expensive, it's the general dio checks that are which > check memory alignment as well. Well, the memory alignment has to walk over the whole iterator, so it definitively is way more expensive.
