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SSD weirdness - CrystalMark slows down after installation of applications

zerogear

zerogear

Diamond Member
After a fresh install of the OS and only installing a couple of patches from WU, I tried Crystal Mark, the sequential read is about 220 and the write is about 215 or so.

After installing drivers and applications (drive is probably around 60% full). I ran CrystalMark again, but this time, I am averaging around 133MB/s for both read/write --

Edit: Seems like after installing Intel RST, it kicked me into 1.5Gbps mode for SATA... I wonder if there is any way to revert it.
 
Last edited:
More info:
Seems to only work properly if I am using 8.6.xxx driver, currently using 10.x RST drivers

samsungssd-latestrst.png
 
Shouldn't the intel RST drivers get installed while you are installing windows? That's how I've done it. The whole f5 to install drivers and such.
 
Windows seemed to have built in drivers for the RAID Controller, that I didn't need to add drivers to installation.
 
Right, but the MS drivers had some issue or something so it was suggested that you do the Intel RST drivers from the start instead of after windows being installed.
 
Actually, the default driver is the only one that seems to be working properly with SATA2 -- any time I install Intel RST 9.6 or 10.0 version of the driver, it drops me into 1.5 Gb/s (SATA 1) and not where I am supposed to which is SATA2 @ 3.0 Gbps. It's pretty evident performance-wise.

The red bench is version 8.6.2.1012 (Windows default) and the blue is the RST 10.1.0.1008.

I've also tried the 9.6 version, performance was identical to 10.1.0.1008.

samsungSSD-bench.png
 
After wayyyyyyyyyyyy too much formatting/reinstalling. Uninstalling storage drivers, etc etc. I've finally figured out why it was dropping me to 1.5 Gbps -- seems like that the RST drivers when installed on a laptop it enables a feature to 'power save' -- Link Power Management (LPM)

The fix was to change in the registry
HKLM\SYSTEM\CurrentControlSet\services\iaStorV\Parameters\Port0 (corrosponding port that you are having the problem with. Change the LPM DWORD value to 0, and it'll disable the LPM and put it back into 3.0 Gbps intead of 1.5 Gbps.

Posted for posterity's sake in case anyone ever have this same issue.

Caused me over 24 hours of grief. 😛
 
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