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Thread: SSD poor performances

  1. #11
    Join Date
    Jul 2007
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    46

    Re: SSD poor performances

    Thank for this answer.

    I found this link very informative on hdparm.

    In fact the "Timing cached reads" (hdparm -T) are not a SSD value but a Linux buffer speed value.

    Good to know!

  2. #12
    Join Date
    Apr 2008
    Location
    LOCATION=/dev/random
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    5,767
    Distro
    Ubuntu Development Release

    Re: SSD poor performances

    Quote Originally Posted by Trompette83 View Post
    Thank for this answer.

    I found this link very informative on hdparm.

    In fact the "Timing cached reads" (hdparm -T) are not a SSD value but a Linux buffer speed value.

    Good to know!
    Indeed.

    That's why I though there was nothing wrong with your original read speeds of 473MB/s and 499MB/s. Those are some very good speeds.
    Cheesemill

  3. #13
    Join Date
    Feb 2005
    Location
    Melbourne, Australia
    Beans
    13,505
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: SSD poor performances

    Quote Originally Posted by Trompette83 View Post
    Thank for this answer.

    I found this link very informative on hdparm.

    In fact the "Timing cached reads" (hdparm -T) are not a SSD value but a Linux buffer speed value.

    Good to know!
    If you no longer have a "problem", then Mark The Thread.
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  4. #14
    Join Date
    Dec 2012
    Beans
    4

    Re: SSD poor performances

    @Trompette83

    "Enable Automatic TRIM => Tested OK"
    is it meaning you did this test ? https://sites.google.com/site/lightr...bledandworking

    thanks

  5. #15
    Join Date
    Jul 2012
    Beans
    14

    Re: SSD poor performances

    I would like continue this thread because I have a issue that seems worse to me. I have the same SSD Samsung 840 Pro but hdparm gives me only a read speed of 269MB when I thought to get around 400-500.

    I tried 3 times different partitions with no luck and I put 1MB of space at the beginning of the disk. I also added noatime and trim support but I still have to test if trim works. I checked the SATA version and it seems that the disk is properly using a SATA III connector but I am still not sure because I see multiple SATA controllers, one of them seems to be limited to SATA 3Gbp (but I hope is the CD driver)

    Then if this can be a SSD firmware issue I would like to know how to update on linux since I tried the Samsung .iso but is not bootable

    Anyone could please lead me to the correct troubleshooting procedure? thanks a lot

  6. #16
    Join Date
    Jul 2012
    Beans
    14

    Re: SSD poor performances

    Solved!! The problem was the SATA cable, to much twisted to fit in the motherboard. Relaxing the cable brings me the speed of 540MB
    To check if you have this problem a good place was
    sudo dmesg | grep -iE '(ata|ahci)'
    there I found an error that disappears with a good cable
    Hope this helps

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