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    <p><font face="Bitstream Vera Sans">Thanks for your help. I will
        read the manual on tuned. <br>
      </font></p>
    <p><font face="Bitstream Vera Sans"><br>
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    <pre class="moz-signature" cols="72">Ben Bullard
ben79
--------------------
OpenMandriva-QA Team
</pre>
    <div class="moz-cite-prefix">On 12/26/2016 07:00 PM, Tomasz Gajc
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAEkne-qP4edpG6hNf92A2zqOxB1jq-GBe0DO3D-cpm5R9RuEEw@mail.gmail.com"
      type="cite">
      <div dir="auto">Great then. Please be aware that tuned is doing a
        lot optimizations. In my case it was setting APM to low on sata
        links which reduced performance. Anyways tuned can be adjusted
        with proper settings. Read manual.</div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">27.12.2016 12:28 AM "Ben Bullard" <<a
            moz-do-not-send="true" href="mailto:benbullard79@cox.net">benbullard79@cox.net</a>>
          napisał(a):<br type="attribution">
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            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000">
              <p>I tried throughput-performance, desktop, and realtime
                and had same problem with all. Then I tried disabling
                tuned.service and that worked in that there are no
                longer drops or fluctuations in read speed under hdparm
                over 10 hour time period.<br>
              </p>
              <div class="quoted-text">
                <pre class="m_-4151017798622765672moz-signature" cols="72">Ben Bullard
ben79
--------------------
OpenMandriva-QA Team
</pre>
              </div>
              <div class="quoted-text">
                <div class="m_-4151017798622765672moz-cite-prefix">On
                  12/25/2016 05:19 PM, Tomasz Paweł Gajc wrote:<br>
                </div>
              </div>
              <blockquote type="cite">
                <div class="quoted-text">
                  <pre>Dnia niedziela, 25 grudnia 2016 16:58:19 CET Ben Bullard pisze:
</pre>
                </div>
                <blockquote type="cite">
                  <pre>Drive in question: Model Family:     Crucial/Micron
MX100/MX200/M5x0/M600 Client SSDs

Device Model:     Crucial_CT500MX200SSD4

Firmware Version: MU04

Ok, this problem isn't going away. TPG, Colin, Bero, or anyone what logs
or test/commands in addition to omv-bug-report.log do I need to include
for a bug report on this. 
</pre>
                </blockquote>
                <pre>Hard to say what may be the problem.
Maybe it's related to aggresive APM on your SATA ports.

tuned daemon may interfere here.

take a look on:
tuned-adm active

then change to diffrent profile:

tuned-adm profile throughput-performance

and then run hdparm tests

</pre>
                <div class="quoted-text">
                  <blockquote type="cite">
                    <pre>There was a kernel-firmware (20161225) update
today I hoped would address this but it didn't. 
</pre>
                  </blockquote>
                </div>
                <pre>kernel-firmware has nothing to do with firmware with your disk.


On my SSD Samsung EVO 840 on Lx 3.0 i got stable results:

[root@lazur tpg]# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 762 MB in  3.01 seconds = 253.56 MB/sec
[root@lazur tpg]# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 778 MB in  3.00 seconds = 259.29 MB/sec
[root@lazur tpg]# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 778 MB in  3.01 seconds = 258.63 MB/sec


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