[OM Cooker] Problem: SSD drastic drop in hdparm/disk reads.
Ben Bullard
benbullard79 at cox.net
Mon Dec 26 20:18:56 EST 2016
Thanks for your help. I will read the manual on tuned.
Ben Bullard
ben79
--------------------
OpenMandriva-QA Team
On 12/26/2016 07:00 PM, Tomasz Gajc wrote:
> 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.
>
> 27.12.2016 12:28 AM "Ben Bullard" <benbullard79 at cox.net
> <mailto:benbullard79 at cox.net>> napisał(a):
>
> 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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