Hi Miklos, I want to enlarge the fuse request's bufsize from 128K to 1MB for more bandwidth as follows, but it does not work. 1. In libfuse, setting fuse_init_out: outarg->max_write = 1024 * 1024; // 1MB outarg->max_pages = 256; // 1MB 2. In kernel, fuse_send_write just handle 4B once a time, and failed at last despite 'req->max_pages' is already set to 256. I wonder if some more adaption needed or I just went the wrong way? Looking forward to your rely. Thanks, Jun