[OM Cooker] Problem: SSD drastic drop in hdparm/disk reads.

Colin Close itchka at compuserve.com
Tue Dec 27 06:25:42 EST 2016


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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