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

Tomasz Gajc tpgxyz at gmail.com
Mon Dec 26 20:00:54 EST 2016


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> 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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