On 5/15/25 16:03, wangtao wrote: > [wangtao] My Test Configuration (CPU 1GHz, 5-test average): > Allocation: 32x32MB buffer creation > - dmabuf 53ms vs. udmabuf 694ms (10X slower) > - Note: shmem shows excessive allocation time
Yeah, that is something already noted by others as well. But that is orthogonal. > > Read 1024MB File: > - dmabuf direct 326ms vs. udmabuf direct 461ms (40% slower) > - Note: pin_user_pages_fast consumes majority CPU cycles > > Key function call timing: See details below. Those aren't valid, you are comparing different functionalities here. Please try using udmabuf with sendfile() as confirmed to be working by T.J. Regards, Christian.
