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Old 3rd January 2017, 02:53 AM
benbullard79 Offline
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Join Date: Nov 2011
Location: Baton Rouge, Louisiana, US
Posts: 15
linuxfirefox
Tuned and SSD performance question.

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:

Code:
# 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':

Code:
# /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.
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Ben Bullard
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  #2  
Old 3rd January 2017, 06:23 AM
dd_wizard Offline
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Join Date: Sep 2009
Posts: 1,923
linuxfedorafirefox
Re: Tuned and SSD performance question.

From reading the output of "sudo dnf info tuned", I'd say either turn it off (remove it). or report a bug against the package. "sudo systemctl disable tuned" followed by "sudo systemctl stop tuned" will disable and stop it, "sudo dnf remove tuned" will remove it.
Code:
$ sudo dnf info tuned
Last metadata expiration check: 6:54:08 ago on Mon Jan  2 14:19:30 2017.
Available Packages
Name        : tuned
...
Description : The tuned package contains a daemon that tunes system settings dynamically.
            : It does so by monitoring the usage of several system components periodically.
            : Based on that information components will then be put into lower or higher
            : power saving modes to adapt to the current usage. Currently only ethernet
            : network and ATA harddisk devices are implemented.
My guess is after monitoring the SSD for a while, tuned is changing power management for the SSD. Apparently, this power management is adversely affecting performance. I've never seen this issue on my Fedora 24 laptop with a Crucial SSD, but I do not have tuned installed.

dd_wizard
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  #3  
Old 4th January 2017, 02:59 AM
benbullard79 Offline
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Join Date: Nov 2011
Location: Baton Rouge, Louisiana, US
Posts: 15
linuxfirefox
Re: Tuned and SSD performance question.

Quote:
Originally Posted by dd_wizard View Post
My guess is after monitoring the SSD for a while, tuned is changing power management for the SSD. Apparently, this power management is adversely affecting performance. I've never seen this issue on my Fedora 24 laptop with a Crucial SSD, but I do not have tuned installed.

dd_wizard
Thanks, at this time tuned is disabled on my systems.
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Ben Bullard
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