<div dir="auto">By default /tmp is mounted on RAM. Second hdparm does not use /tmp<div dir="auto"><br></div><div dir="auto">I checked my ssd an it is running latest firmware, and it is trimmed.</div><div dir="auto"><div dir="auto"> </div></div></div><div class="gmail_extra"><br><div class="gmail_quote">27.12.2016 11:53 PM "Colin Close" <<a href="mailto:itchka@compuserve.com">itchka@compuserve.com</a>> napisał(a):<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Tomek,<br>
The only thing other thing that I can think of is that is a bit unusual about my system is that I use a small 32Gb drive for my swap and /tmp partitions<br>
I suppose if hdparm used the /tmp directory for it's operations it might make a difference.<br>
Just a thought.<br>
Best,<br>
Colin<br>
<br>
On Tuesday, 27 December 2016 11:25:42 GMT you wrote:<br>
> Tomek,<br>
> Are you sure you don't have a problem?<br>
> I have a Samsung SSD 850 EVO 500GB<br>
> and I'm getting<br>
> Timing buffered disk reads: 1392 MB in 3.00 seconds = 463.56 MB/sec<br>
> Timing buffered disk reads: 1396 MB in 3.00 seconds = 464.81 MB/sec<br>
> Timing buffered disk reads: 1412 MB in 3.00 seconds = 470.39 MB/sec<br>
><br>
> and timing for cached reads: 8024 MB in 2.00 seconds = 4014.81 MB/sec for the cache.<br>
><br>
> I'm using f2fs and this mother board is nothing special being AMD and of 2013 vintage it is 8 core though and has 16Gig of RAM.<br>
> It's the same drive just bigger.<br>
> Best,<br>
> Colin<br>
><br>
><br>
><br>
> On Monday, 26 December 2016 17:26:23 GMT Ben Bullard wrote:<br>
> > I tried throughput-performance, desktop, and realtime and had same<br>
> > problem with all. Then I tried disabling tuned.service and that worked<br>
> > in that there are no longer drops or fluctuations in read speed under<br>
> > hdparm over 10 hour time period.<br>
> ><br>
> > Ben Bullard<br>
> > ben79<br>
> > --------------------<br>
> > OpenMandriva-QA Team<br>
> ><br>
> > On 12/25/2016 05:19 PM, Tomasz Paweł Gajc wrote:<br>
> > > Dnia niedziela, 25 grudnia 2016 16:58:19 CET Ben Bullard pisze:<br>
> > >> Drive in question: Model Family: Crucial/Micron<br>
> > >> MX100/MX200/M5x0/M600 Client SSDs<br>
> > >><br>
> > >> Device Model: Crucial_CT500MX200SSD4<br>
> > >><br>
> > >> Firmware Version: MU04<br>
> > >><br>
> > >> Ok, this problem isn't going away. TPG, Colin, Bero, or anyone what logs<br>
> > >> or test/commands in addition to omv-bug-report.log do I need to include<br>
> > >> for a bug report on this.<br>
> > > Hard to say what may be the problem.<br>
> > > Maybe it's related to aggresive APM on your SATA ports.<br>
> > ><br>
> > > tuned daemon may interfere here.<br>
> > ><br>
> > > take a look on:<br>
> > > tuned-adm active<br>
> > ><br>
> > > then change to diffrent profile:<br>
> > ><br>
> > > tuned-adm profile throughput-performance<br>
> > ><br>
> > > and then run hdparm tests<br>
> > ><br>
> > >> There was a kernel-firmware (20161225) update<br>
> > >> today I hoped would address this but it didn't.<br>
> > > kernel-firmware has nothing to do with firmware with your disk.<br>
> > ><br>
> > ><br>
> > > On my SSD Samsung EVO 840 on Lx 3.0 i got stable results:<br>
> > ><br>
> > > [root@lazur tpg]# hdparm -t /dev/sda<br>
> > ><br>
> > > /dev/sda:<br>
> > > Timing buffered disk reads: 762 MB in 3.01 seconds = 253.56 MB/sec<br>
> > > [root@lazur tpg]# hdparm -t /dev/sda<br>
> > ><br>
> > > /dev/sda:<br>
> > > Timing buffered disk reads: 778 MB in 3.00 seconds = 259.29 MB/sec<br>
> > > [root@lazur tpg]# hdparm -t /dev/sda<br>
> > ><br>
> > > /dev/sda:<br>
> > > Timing buffered disk reads: 778 MB in 3.01 seconds = 258.63 MB/sec<br>
> > ><br>
> > ><br>
> > ><br>
> > ><br>
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> ><br>
><br>
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</blockquote></div></div>