[OM Cooker] Problem: SSD drastic drop in hdparm/disk reads.
Ben Bullard
benbullard79 at cox.net
Mon Dec 26 18:26:23 EST 2016
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
>
>
>
>
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