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Tuned and SSD performance question.
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  1. #1
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    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.
    Thanks,
    Ben Bullard

  2. #2
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    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

  3. #3
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    Re: Tuned and SSD performance question.

    Quote Originally Posted by dd_wizard
    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.
    Thanks,
    Ben Bullard

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