Is PCIE x4 bootable for NVMe SSD under Linux

[dukla2000]

OK - got rootfs on NVMe and 4.18 kernel:

Code:

$ uname -a Linux rpro64.dukla.net 4.18.0-rc8-1060-ayufan-g45828c4db727 #1 SMP PREEMPT Thu Aug 9 19:41:21 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux chris@rpro64:~$ df -h Filesystem      Size  Used Avail Use% Mounted on udev            982M     0  982M   0% /dev tmpfs           199M  636K  199M   1% /run /dev/nvme0n1p1  117G  7.4G  104G   7% / tmpfs           994M   58M  936M   6% /dev/shm tmpfs           5.0M  4.0K  5.0M   1% /run/lock tmpfs           994M     0  994M   0% /sys/fs/cgroup /dev/mmcblk0p6  112M  4.0K  112M   1% /boot/efi tmpfs           199M  4.0K  199M   1% /run/user/1000

And yup, that NVMe is quicker than under 4.4:

Code:

$ sudo iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2     Iozone: Performance Test of File I/O             Version $Revision: 3.429 $         Compiled for 64 bit mode.         Build: linux     Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins                  Al Slater, Scott Rhine, Mike Wisner, Ken Goss                  Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,                  Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,                  Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,                  Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,                  Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer,                  Vangel Bojaxhi, Ben England, Vikentsi Lapa.     Run began: Wed Aug 15 21:44:08 2018     Include fsync in write timing     O_DIRECT feature enabled     Auto Mode     File size set to 102400 kB     Record Size 4 kB     Record Size 16 kB     Record Size 512 kB     Record Size 1024 kB     Record Size 16384 kB     Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2     Output is in kBytes/sec     Time Resolution = 0.000001 seconds.     Processor cache size set to 1024 kBytes.     Processor cache line size set to 32 bytes.     File stride size set to 17 * record size.                                                               random    random     bkwd    record    stride                                                   kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread           102400       4    63115   109487   126839   120045    52068   140978                                                                     102400      16   225493   319486   335585   347588   122025   321304                                                                     102400     512   723276   737359   901821   973829   807431   735093                                                                     102400    1024   720335   739367   924279  1004689   926714   735601                                                                     102400   16384   510442   732234  1308627  1466939  1448327   734839                                                           iozone test complete.

Will post instructions in the Tutorial sub-forum shortly.