[NFS-Ganesha-Devel] rsize and wsize on centos7.2 not working

In CentOS7.2 under v4.0, the wsize is 1048576, but when writing 1048576 bytes on a file, ganesha receives 4 requests.The problem is who splits the 1MB request to 4 requests(256KB)?Is anyone know about this? Thanks in advance. Ganesha server info ganesha version: V2.7.6 FSAL : glusternfs client info nfs version : nfs v4.0 client info : CentOS Linux release 7.2.1511(3.10.0-327.el7.x86_64)