Re: Regarding installing pmem on ubuntu 15.10.

Hello Sir, I have recompiled the kernel with the specified parameters and mount /dev/pmem0 is created as expected. But when I'm trying to do this: mount -o dax /dev/pmem0 /mnt/mem I'm getting an error : "mount: wrong fs type, bad option, bad superblock on /dev/pmem0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so." When I tried to do dmesg | tail this is the problem: [ 31.774476] IPv6: ADDRCONF(NETDEV_UP): enp0s3: link is not ready [ 31.806229] IPv6: ADDRCONF(NETDEV_UP): enp0s3: link is not ready [ 31.831371] e1000: enp0s3 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX [ 31.869701] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s3: link becomes ready [ 56.564609] ISO 9660 Extensions: Microsoft Joliet Level 3 [ 56.624335] ISO 9660 Extensions: RRIP_1991A [ 311.012892] EXT4-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk [ 311.034607] EXT4-fs (pmem0): error: unsupported blocksize for dax [ 397.781094] EXT4-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk [ 397.792969] EXT4-fs (pmem0): error: *unsupported blocksize for dax* I have also tried to search for this error in this source: https://lkml.org/lkml/2015/12/23/385 But it is regarding mounting xfs instead on ext4. Do you suggest any alternative to make this work with ext4? I really apologize for sending you using Gmail not using mutt or git send email but I'm a newbie to this. Awaiting your response.

Thanks & Regards, NAGA VENKATA SAI INDUBHASKAR JUPUDI, Department of Computer Engineering, University of California, Santa Cruz. On Thu, Feb 11, 2016 at 7:43 AM, Ross Zwisler <ross.zwisler(a)linux.intel.com&gt; wrote: > On Wed, Feb 10, 2016 at 09:53:53PM -0800, NAGA VENKATA SAI INDUBHASKAR > JUPUDI wrote: > > Hello Sir, > > > > I'm a student from University of Caliornia, SantaCruz. I'm trying to > > install pmem device on ubuntu 15.10 following the guideline mentioned in: > > > > https://nvdimm.wiki.kernel.org/ > > > > > > But I'm stuck at one point. After configuring the correct kernel > parameters > > should I need to do something more in order to get pmem device because > when > > I'm trying to do > > > > fdisk -l /dev/pmem0 > > > > I'm getting an error no such folder. > > > > I'm stuck at this point (highlighted in red) > > > > [image: Inline image 1] > > > > Can you please suggest me what am I doing wrong here. I apologize for the > > inconvenience caused. > > > > > > Thanks & Regards, > > NAGA VENKATA SAI INDUBHASKAR JUPUDI, > > Department of Computer Engineering, > > University of California, Santa Cruz. > > Well, the implicit steps between "set up the correct kernel config" and > "use > fdisk" are "compile a kernel with the new config, reboot using that newly > compiled kernel". > > Also, make sure you are setting up the memmap kernel param correctly: > > > https://nvdimm.wiki.kernel.org/how_to_choose_the_correct_memmap_kernel_pa... >