[OM Cooker] Problem: SSD drastic drop in hdparm/disk reads.
Colin Close
itchka at compuserve.com
Tue Dec 27 17:51:28 EST 2016
Tomek,
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
I suppose if hdparm used the /tmp directory for it's operations it might make a difference.
Just a thought.
Best,
Colin
On Tuesday, 27 December 2016 11:25:42 GMT you wrote:
> Tomek,
> Are you sure you don't have a problem?
> I have a Samsung SSD 850 EVO 500GB
> and I'm getting
> Timing buffered disk reads: 1392 MB in 3.00 seconds = 463.56 MB/sec
> Timing buffered disk reads: 1396 MB in 3.00 seconds = 464.81 MB/sec
> Timing buffered disk reads: 1412 MB in 3.00 seconds = 470.39 MB/sec
>
> and timing for cached reads: 8024 MB in 2.00 seconds = 4014.81 MB/sec for the cache.
>
> 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.
> It's the same drive just bigger.
> Best,
> Colin
>
>
>
> On Monday, 26 December 2016 17:26:23 GMT Ben Bullard wrote:
> > 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.
> >
> > Ben Bullard
> > ben79
> > --------------------
> > OpenMandriva-QA Team
> >
> > On 12/25/2016 05:19 PM, Tomasz Paweł Gajc wrote:
> > > Dnia niedziela, 25 grudnia 2016 16:58:19 CET Ben Bullard pisze:
> > >> 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.
> > > 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
> > >
> > >> There was a kernel-firmware (20161225) update
> > >> today I hoped would address this but it didn't.
> > > 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 at lazur tpg]# hdparm -t /dev/sda
> > >
> > > /dev/sda:
> > > Timing buffered disk reads: 762 MB in 3.01 seconds = 253.56 MB/sec
> > > [root at lazur tpg]# hdparm -t /dev/sda
> > >
> > > /dev/sda:
> > > Timing buffered disk reads: 778 MB in 3.00 seconds = 259.29 MB/sec
> > > [root at lazur tpg]# hdparm -t /dev/sda
> > >
> > > /dev/sda:
> > > Timing buffered disk reads: 778 MB in 3.01 seconds = 258.63 MB/sec
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > OM-Cooker mailing list
> > > OM-Cooker at ml.openmandriva.org
> > > http://ml.openmandriva.org/mailman/listinfo/om-cooker_ml.openmandriva.org
> >
>
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