On Fri, Sep 23, 2022 at 09:19:15AM -0600, Jens Axboe wrote: > On 9/23/22 9:16 AM, Christoph Hellwig wrote: > > On Thu, Sep 22, 2022 at 12:28:00PM -0600, Jens Axboe wrote: > >> This is good for a 10% improvement for passthrough performance. For > >> a non-drive limited test case, passthrough IO is now more efficient > >> than the regular bdev O_DIRECT path. > > > > How so? If it ends up faster we are doing something wrong in the > > normal path as there should be no fundamental difference in the work > > that is being done. > > There's no fundamental difference, but the bdev path is more involved > than the simple passthrough path. Well, I guess that means there is some more fat we need to trim then..
