Long boot time on Samsung 850 EVO 500GB SSD

I just installed Ubuntu 18.04 LTS on my ASUS ROG Laptop G750JM (Linux 4.15.0-22-generic #24-Ubuntu SMP Wed May 16 12:15:17 UTC 2018) x86-64

Seems really slow on boot and launching applications (firefox, etc)

Startup finished in 2.785s (firmware) + 4.327s (loader) + 36.264s (kernel) + 15.546s (userspace) = 58.923s graphical.target reached after 15.540s in userspace

Any help appreciated.

1 Answer

Slow boot

Slow boot may be caused by this bug. If you don't need hibernation, this bug can be worked around by adding noresume to the kernel command line (see here for how to change the kernel command line).

Performance

The performance of your SSD can be easily tested using gnome-disks.

1. Make sure it is installedsudo apt-get install gnome-disk-utility
2. Start gnome-disks (named Disks in the menu).
3. Select your disk on the left
4. Click on the gear wheels, select Benchmark partition...
5. Click on Start Benchmark...
6. Keep the default options, then Start Benchmarking...

This kind of disk should show around 500 MB/s in read speed and around 0.1 ms for the access time, if not you may have a configuration problem, maybe the SATA controller mode should be set to AHCI in the BIOS.

If the disk performances are correct, and you still feel a performance problem, it may be not related to your disk.