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theGOAT
03-29-2016, 02:14 PM
hello, like the title states, i have this issue when everytime my computer wakes from sleep. the read and write speed of sm951 nvme reduce significantly from 2200 read to only 700 read speed. i have to do a restart to get back the max speed of the drive again. anyone else having this issue or can help me? thanks!

JustinThyme
03-29-2016, 11:30 PM
Which NVMe drivers are you using? My bet is there is a conflict with the right driver loading from hiberfil.sys file on resume.
I don't use sleep, hibernate or even fast boot as I don't want to have the kernel, memory and drivers dumped to a 4-6GB file write every time on my SSD. Sleep, hibernate and fast boot have their place with spinners but are outdated with an SSD.

theGOAT
03-30-2016, 01:10 AM
Which NVMe drivers are you using? My bet is there is a conflict with the right driver loading from hiberfil.sys file on resume.
I don't use sleep, hibernate or even fast boot as I don't want to have the kernel, memory and drivers dumped to a 4-6GB file write every time on my SSD. Sleep, hibernate and fast boot have their place with spinners but are outdated with an SSD.

Thank you for your response. Its an oem drive, i dont see driver support on asus driver page. So best is not to put computer to sleep? Thanks!

JustinThyme
03-30-2016, 01:34 AM
This drivers are native to Windows 8.1 and later.
I don't use the sleep, hibernate or fast boot for the reasons mentioned. Another point is even with fast boot you don't get a clean start so if you are having issues you dont get a full shutdown and reload of your platform and drivers. Disabling this gives you a fresh boot every time and better performance, not to mention avoids issues such as yours.
You only get so many writes to an SSD and this burns them up with a fairly large file. Some argue the point of leaving applications running and they can resume work faster. I've always been in the habit of saving work and closing applications before shutting down. Everyone seems to be in too much of a hurry to shave a few seconds off of this or that. Comparing the G752VY to my POS HP company issued work machine is night and day. Just getting to desktop with that thing takes several minutes, especially once our IT Dept gets done hacking up the windows install and has a zillion services running in the background. You know its bad when you go to launch a browser and the first thing you do is disable their automatic configuration script (that gets reenabled anyhow) because it makes just opening a browser take 2-3 minutes and it often locks with something not loading.

Gustave
04-04-2016, 11:52 AM
I have replaced the M.2 NVMe Samsung 951 ssd with the 950 Pro. I have noticed that after having the G752VY on for a while I get slow (for this drive) read speeds on the drive (746) and right after a reboot they are on par again (2229).

Aida64 Extreme 5.70.3611 Beta one minute one after the other:
5672056721

Jon G
04-04-2016, 10:21 PM
My new G752VY DH78K non RAID, stock settings, 256GB OEM Samsung SM951 PCIe 3.0 NVMe M.2 OS SSD
w/ 149GB of free space won't even complete the AS SSD Benchmark version 1.8.5636.37293 to get a final score.
I get a dismal initial Write of 23.25 MB/s, Read of 1875 MB/s and by the time it starts the 4K Write it takes so long
to complete I'm forced to cancel the Benchmark. I'm thinking it must be an issue w/ AS SSD Benchmark & NVMe
(non AHCI)?
Guess I'll try using latest Samsung Magician SSD Benchmark tool and Crystal Disk Mark instead.
The 256GB OEM Samsung SM951 NVMe SSD should get closer to 2150 MB/s Read, 1250 MB/s Write if I'm
not mistaken?
Using the ATTO Benchmark tool version 3.5.0.0 the Read peaks at 2250 MB/s but the Write peaks
at only 550 MB/s max using any available transfer rates ?
The Windows 10 Control Panels Defragment and Optimize Drives is set to On. So far, my G752VY DH78Ks'
256GB OEM Samsung SM951 NVMe SSD benchmark numbers especially on the Write are terrible w/ factory
hardware. Maybe this new G752VY DH78K comes stock w/ crappy 2x 256 OEM Samsung PM951 NVMe SSDs'
instead of the better OEM Samsung SM951 NVMe SSDs?
That would explain my crap Write speeds or the 2x 256GB OEM Samsung SM951 NVMe M.2 SSDs'
are bad somehow?
I disabled sleep & hibernate, everything w/ Power settings set to Maximum Power 100% always, Trim on
and verified. WTF?
Even my G751JY that has a 512GB OEM Samsung SM951 AHCI OS SSD & can't reach higher then 1601 MB/s
Read, gets up to 1496 MB/s Write using any Benchmarks.

theGOAT
04-05-2016, 02:09 AM
I have replaced the M.2 NVMe Samsung 951 ssd with the 950 Pro. I have noticed that after having the G752VY on for a while I get slow (for this drive) read speeds on the drive (746) and right after a reboot they are on par again (2229).

Aida64 Extreme 5.70.3611 Beta one minute one after the other:
5672056721

i am also having this exact same issue with my sm951 nvme oem

JustinThyme
04-05-2016, 03:44 AM
Please use crystalmarks AIDA64 for some reason has issues on this platform.

http://crystalmark.info/software/CrystalDiskMark/index-e.html

I got decent socres all the time with my OEM SM951, not as good as the 950 pro but still decent.
Here is the first 950 pro by itself

56727


Here is after adding the second 950 pro in raid 0

56728



Here is a small list of tweaks that I deployed. Some argue the prefetch and write cache buffer flushing. I get good results so I choose to deploy them

https://rog.asus.com/forum/showthread.php?83092-SM951-M2-SSD-read-speeds-in-a-G751&p=574386&viewfull=1#post574386

Gustave
04-05-2016, 09:00 AM
Please use crystalmarks AIDA64 for some reason has issues on this platform.

http://crystalmark.info/software/CrystalDiskMark/index-e.html

I got decent socres all the time with my OEM SM951, not as good as the 950 pro but still decent.
Here is the first 950 pro by itself

56727


Here is after adding the second 950 pro in raid 0

56728



Here is a small list of tweaks that I deployed. Some argue the prefetch and write cache buffer flushing. I get good results so I choose to deploy them

https://rog.asus.com/forum/showthread.php?83092-SM951-M2-SSD-read-speeds-in-a-G751&p=574386&viewfull=1#post574386

Justin,

You lead, I follow ;)

After a while:
56732

After a reboot:
56733

It looks like the drive throttles after a while. Have to check if it occurs after a specific action or if it happens randomly.

JustinThyme
04-05-2016, 02:54 PM
You have something else going on there brother. I don't think its throttling or a reboot wouldn't help any.
Are you running any kind of AV Webroot, Norton etc or other service that may be hammering the drive with excessive reads in the background?
MySQL DB running a query, indexing service running, and a miriad of other things could also cause this too.
You can have a peep at disk activity under the task manager performace tab.
I have a strange suspicion this has nothing to do with the drive or drivers and everything to do with another app/service running and pinging your drive while you run the benchmark.

Dont know if you saw this either in my last post, kinda hiding but give these a whirl.
https://rog.asus.com/forum/showthread.php?83092-SM951-M2-SSD-read-speeds-in-a-G751&p=574386&viewfull=1#post574386

Jon G
04-05-2016, 07:54 PM
I stand corrected, CDM confirms my G752VY DH78K 2x 256GB OEM Samsung SM951 NVMe SSD's score
2100 MB/s Read, 1261MB/s Write-----------------------------------------------------------------------
CrystalDiskMark 5.1.2 x64 (C) 2007-2016 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

Sequential Read (Q= 32,T= 1) : 2100.974 MB/s
Sequential Write (Q= 32,T= 1) : 1261.281 MB/s
Random Read 4KiB (Q= 32,T= 1) : 485.224 MB/s [118462.9 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 128.459 MB/s [ 31362.1 IOPS]
Sequential Read (T= 1) : 1603.468 MB/s
Sequential Write (T= 1) : 1263.115 MB/s
Random Read 4KiB (Q= 1,T= 1) : 49.295 MB/s [ 12034.9 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 156.749 MB/s [ 38268.8 IOPS]

Test : 1024 MiB [C: 37.0% (87.9/237.7 GiB)] (x3) [Interval=3 sec]
Date : 2016/04/05 15:55:20
OS : Windows 10 [10.0 Build 10586] (x64)
ASUS ROG G752VY DH78K/ 256GB SM951 NVMe SSD
;

Gustave
04-05-2016, 09:37 PM
I had already tweaked my NB with some of the settings you describe in that post. I do have Norton 360 running. It had some disk cleaning and organising tasks planned. I switched those off. See what it does.

Gustave
04-06-2016, 06:34 AM
Must have been Norton kicking in at some point (doing tasks when idle or something)
56739
Regards!