> -----Original Message----- > From: Cholerae Hu [mailto:choleraehyq@xxxxxxxxx] > Sent: Wednesday, December 23, 2015 8:36 PM > Subject: Re: A blocksize problem about dax and ext4 ... > xfs will silently disable dax when the fs block size is too small, > i.e. your mmap() operations are backed by page cache in this case. > Currently the only indication of whether a mapping is DAX backed or > not is the presence of the VM_MIXEDMAP flag ("mm" in the VmFlags field > of /proc/<pid>/smaps) > > Did you mean that I should make the blocksize bigger until the mount > command tell me that dax is enabled? To really use DAX, the filesystem block size must match the system CPU's page size, which is probably 4096 bytes. --- Robert Elliott, HPE Persistent Memory ��.n��������+%������w��{.n�����{�����ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
