I'm using (mostly) OpenMandriva Lx 3.0. My understanding is that we get a lot of packages from Fedora. Also that tuned is a Red Hat/Fedora creation. OM Lx 3 comes with tuned enabled by default with 'balanced' profile. I'm a user not a developer. My SSD is:
# smartctl -i /dev/sdc
smartctl 6.5 2016-05-07 r4318 [x86_64-linux-4.9.0-desktop-4omv] (OpenMandriva Lx 6.5-1)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Crucial/Micron MX100/MX200/M5x0/M600 Client SSDs
Device Model: Crucial_CT500MX200SSD4
Serial Number: 15060EA78894
LU WWN Device Id: 5 00a075 10ea78894
Firmware Version: MU04
User Capacity: 500,107,862,016 bytes [500 GB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: Solid State Device
Form Factor: < 1.8 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 4
SATA Version is: SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Mon Jan 2 19:40:19 2017 CST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
My question is that I notice with tuned enabled the 'timed read' numbers from 'hdparm -Tt /dev/sdc' start around 485 MB/sec but drop (in less than an hour) to as low as 30-35 MB/sec. Any ideas why this would be? Disabling tuned.service turning off computer and turning back on corrects this. Should I just disable tuned.service or is there a way to use tuned with this Curcial SSD to good effect? I have tried a number of different profiles and so far all do this. I tried in addition to balanced, desktop, realtime, and throughput-performance. FWIW: Here's '/etc/fstab':
# /etc/fstab: static file system information.
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=fd099c81-9f23-41d3-a607-00349d56bf3b /Data1 ext4 defaults,noatime 0 2
UUID=b27b2d20-cbfb-4961-b7aa-b42153090011 /Data2 xfs defaults,noatime 0 2
UUID=4F1C-FC50 /boot/efi vfat defaults,noatime 0 2
UUID=4965a2ab-55b8-40af-bac5-ec079e3b078c swap swap defaults,noatime,discard 0 0
UUID=ae3a1136-da21-4e3b-9dcf-f9c6a7560572 / ext4 defaults,noatime,discard 0 1
UUID=7a4efcfa-d8c2-4a5e-9829-016acc494e17 /home ext4 defaults,noatime,discard 0 2
UUID=ef16d8c7-6e1b-4ae3-8980-3dde67eb590a /Data3 ext4 defaults,noatime,discard 0 2
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
I guessed about where to post this so hope I did OK there. If there is anywhere else I could ask about this it would be good to know. Like IRC, or somewhere at Red Hat? Or developer mailing list?
Will provide any info required or do tests ect.