Overclock.net › Forums › Components › Hard Drives & Storage › SSD › Samsung 840 EVO read speed drops on old-written data in the drive
New Posts  All Forums:Forum Nav:

Samsung 840 EVO read speed drops on old-written data in the drive - Page 8

post #71 of 3279
Thank you guys for providing the tools necessary for these tests. So here are my results:

Before: average 317mb/s, lowest ranging from 20-100
After the rigorous "monthly defrag script" : average 481mb/s, lowest only around 410

Here are two screenshots of files ordered on date; the first one shows old files and the last one new files. We can see the correlation between age and slower read speed extremely clearly here.


MahPC
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600 (non k) P8h67-M Pro XFX R9 290 EDBD Kingston 
Hard DriveCoolingOSMonitor
Seagate 7200.11 Coolermaster 412S Windows 8.1 Dell Monicrap 
KeyboardPowerCaseMouse
Dell mechanical keyboard Corsair 850RM unknown Logitech M90 
Audio
Realtek HD integrated audio 
  hide details  
Reply
MahPC
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600 (non k) P8h67-M Pro XFX R9 290 EDBD Kingston 
Hard DriveCoolingOSMonitor
Seagate 7200.11 Coolermaster 412S Windows 8.1 Dell Monicrap 
KeyboardPowerCaseMouse
Dell mechanical keyboard Corsair 850RM unknown Logitech M90 
Audio
Realtek HD integrated audio 
  hide details  
Reply
post #72 of 3279

My 250GB EVO also had this issue. After i ran Defraggler performance seems to be awesome again.

 

Before

 

 

After

Gaming 2016
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700K Gigabyte Z170M-D3H MSI GTX1070 8G ARMOR Kingston HyperX FURY DDR4 
Hard DriveHard DriveHard DriveCooling
Samsung 840 Evo Samsung 850 Evo Seagate SHHD Cooler Master Nepton 240M 
OSMonitorKeyboardPower
Windows 10 Pro XB321HK Logitech 710 Corsair RM550x 
CaseMouseMouse PadAudio
Cooler Master Silencio 352 Logitech G500 Razer Goliathus Presonus Eris 4.5 
  hide details  
Reply
Gaming 2016
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700K Gigabyte Z170M-D3H MSI GTX1070 8G ARMOR Kingston HyperX FURY DDR4 
Hard DriveHard DriveHard DriveCooling
Samsung 840 Evo Samsung 850 Evo Seagate SHHD Cooler Master Nepton 240M 
OSMonitorKeyboardPower
Windows 10 Pro XB321HK Logitech 710 Corsair RM550x 
CaseMouseMouse PadAudio
Cooler Master Silencio 352 Logitech G500 Razer Goliathus Presonus Eris 4.5 
  hide details  
Reply
post #73 of 3279
Quote:
Originally Posted by 1337LutZ View Post

My 250GB EVO also had this issue. After i ran Defraggler performance seems to be awesome again.

Which defrag scheme did you use in Defraggler?
New System
(12 items)
 
  
Reply
New System
(12 items)
 
  
Reply
post #74 of 3279
Quote:
Originally Posted by am dew1 View Post


Which defrag scheme did you use in Defraggler?

 

I just used the Defragment option in the multiselect thing at the bottom. (It says Optimize by default)

Gaming 2016
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700K Gigabyte Z170M-D3H MSI GTX1070 8G ARMOR Kingston HyperX FURY DDR4 
Hard DriveHard DriveHard DriveCooling
Samsung 840 Evo Samsung 850 Evo Seagate SHHD Cooler Master Nepton 240M 
OSMonitorKeyboardPower
Windows 10 Pro XB321HK Logitech 710 Corsair RM550x 
CaseMouseMouse PadAudio
Cooler Master Silencio 352 Logitech G500 Razer Goliathus Presonus Eris 4.5 
  hide details  
Reply
Gaming 2016
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700K Gigabyte Z170M-D3H MSI GTX1070 8G ARMOR Kingston HyperX FURY DDR4 
Hard DriveHard DriveHard DriveCooling
Samsung 840 Evo Samsung 850 Evo Seagate SHHD Cooler Master Nepton 240M 
OSMonitorKeyboardPower
Windows 10 Pro XB321HK Logitech 710 Corsair RM550x 
CaseMouseMouse PadAudio
Cooler Master Silencio 352 Logitech G500 Razer Goliathus Presonus Eris 4.5 
  hide details  
Reply
post #75 of 3279
This could be different things happening with defrag , the fragments are removed and it moves files around so files are rewritten and become new files . Is the speed picking up again because the file is rewritten or is it because it is to much fragmented . On a not regular basis i defrag my ssd when needed with windows defrag , the effect can be very good when combining of free space is used .
On NTFS level i think it is to big of impact for ssd and old files do not fragment automatic , it starts with writing fragmented to ssd or the file could be re-saved and starts to fragment . And it is not easy to get fragmented files on a fast ssd , the evo is fast but maby the TLC could be giving problems when data remains longer on ssd .

1337LutZ

How come the difference in cpu usage with hdtune smile.gif
post #76 of 3279
Quote:
Originally Posted by Fred B View Post

This could be different things happening with defrag , the fragments are removed and it moves files around so files are rewritten and become new files . Is the speed picking up again because the file is rewritten or is it because it is to much fragmented . On a not regular basis i defrag my ssd when needed with windows defrag , the effect can be very good when combining of free space is used .
On NTFS level i think it is to big of impact for ssd and old files do not fragment automatic , it starts with writing fragmented to ssd or the file could be re-saved and starts to fragment . And it is not easy to get fragmented files on a fast ssd , the evo is fast but maby the TLC could be giving problems when data remains longer on ssd .

1337LutZ

How come the difference in cpu usage with hdtune smile.gif

 

The difference should be in the fact that i was not idling whilest running this test.

 

I have found similair issues on a Dutch forum.


Edited by 1337LutZ - 9/7/14 at 9:19am
Gaming 2016
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700K Gigabyte Z170M-D3H MSI GTX1070 8G ARMOR Kingston HyperX FURY DDR4 
Hard DriveHard DriveHard DriveCooling
Samsung 840 Evo Samsung 850 Evo Seagate SHHD Cooler Master Nepton 240M 
OSMonitorKeyboardPower
Windows 10 Pro XB321HK Logitech 710 Corsair RM550x 
CaseMouseMouse PadAudio
Cooler Master Silencio 352 Logitech G500 Razer Goliathus Presonus Eris 4.5 
  hide details  
Reply
Gaming 2016
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700K Gigabyte Z170M-D3H MSI GTX1070 8G ARMOR Kingston HyperX FURY DDR4 
Hard DriveHard DriveHard DriveCooling
Samsung 840 Evo Samsung 850 Evo Seagate SHHD Cooler Master Nepton 240M 
OSMonitorKeyboardPower
Windows 10 Pro XB321HK Logitech 710 Corsair RM550x 
CaseMouseMouse PadAudio
Cooler Master Silencio 352 Logitech G500 Razer Goliathus Presonus Eris 4.5 
  hide details  
Reply
post #77 of 3279
Quote:
Originally Posted by Fred B View Post

This could be different things happening with defrag , the fragments are removed and it moves files around so files are rewritten and become new files . Is the speed picking up again because the file is rewritten or is it because it is to much fragmented . On a not regular basis i defrag my ssd when needed with windows defrag , the effect can be very good when combining of free space is used .
On NTFS level i think it is to big of impact for ssd and old files do not fragment automatic , it starts with writing fragmented to ssd or the file could be re-saved and starts to fragment . And it is not easy to get fragmented files on a fast ssd , the evo is fast but maby the TLC could be giving problems when data remains longer on ssd .

1337LutZ

How come the difference in cpu usage with hdtune smile.gif

The speed picks up because the files are rewritten, I'm pretty sure.

I used a tool that copies data instead of a defragger. I've set input and output to be the drive's device. This means it worked on the drive itself below the file system and partitions. Basically, it reads a block of data of a certain size, then writes it back directly afterwards into the exact same place. Speed was back to normal afterwards.

Sooo... I don't know what's going on here, doesn't make any sense really. The drive should be in worse shape after that operation? Before writing to all of it, the areas without files were known as empty to the SSDs controller through TRIM, and it should have used that information to do something useful. The drive should think it's 100% full after that tool rewrote everything. The tool didn't work with files, so TRIM can't do anything at all, and every single bit of space on the drive has now been written to.
Edited by deepor - 9/7/14 at 11:02am
post #78 of 3279
Trying to find out more about what 'sequential access' actually means for a SSD.
Here is some interesting info:http://codecapsule.com/2014/02/12/coding-for-ssds-part-1-introduction-and-table-of-contents/
Edited by BrainSplatter - 9/7/14 at 12:30pm
Fun
(15 items)
 
AntiAlias
(11 items)
 
 
CPUMotherboardGraphicsRAM
4770K @ 4.5Ghz @ 1.38v delidded Gigabyte GA-Z87X-OC f9c 2 x Zotac 980Ti Amp Omega @1530, @1530 G.SKILL TridentX 2400 CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 256GB 4 x Samsung EVO 850 1TB RAID0 Samsung Blu Ray Cooler Master Seidon 240M 
OSMonitorKeyboardPower
Windows 7 Professional 64 bit Samsung 27" IPS 2560x1440 Logitech Wireless Seasonic Platinum 860 
CaseMouseAudio
NZXT Phantom 630 white Razer ASUS Xonar U7 external 
CPUMotherboardGraphicsGraphics
7700K@5Ghz ASUS ROG STRIX Z270F Asus 1080Ti FE Gigabyte 1080Ti FE 
RAMHard DriveHard DriveOS
Corsair Vengeance LED 32GB (4x 8GB) DDR4 3400MH... Samsung 960 EVO 500GB 4 x 1TB 850 EVO SSD RAID0 Windows 10 Pro 64 Bit 
MonitorPowerCase
LG 27MU67-B 4K BeQuiet Straight Power 10 800W anidees AI-Crystal black 
  hide details  
Reply
Fun
(15 items)
 
AntiAlias
(11 items)
 
 
CPUMotherboardGraphicsRAM
4770K @ 4.5Ghz @ 1.38v delidded Gigabyte GA-Z87X-OC f9c 2 x Zotac 980Ti Amp Omega @1530, @1530 G.SKILL TridentX 2400 CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 256GB 4 x Samsung EVO 850 1TB RAID0 Samsung Blu Ray Cooler Master Seidon 240M 
OSMonitorKeyboardPower
Windows 7 Professional 64 bit Samsung 27" IPS 2560x1440 Logitech Wireless Seasonic Platinum 860 
CaseMouseAudio
NZXT Phantom 630 white Razer ASUS Xonar U7 external 
CPUMotherboardGraphicsGraphics
7700K@5Ghz ASUS ROG STRIX Z270F Asus 1080Ti FE Gigabyte 1080Ti FE 
RAMHard DriveHard DriveOS
Corsair Vengeance LED 32GB (4x 8GB) DDR4 3400MH... Samsung 960 EVO 500GB 4 x 1TB 850 EVO SSD RAID0 Windows 10 Pro 64 Bit 
MonitorPowerCase
LG 27MU67-B 4K BeQuiet Straight Power 10 800W anidees AI-Crystal black 
  hide details  
Reply
post #79 of 3279
So you mean, over time, probably using that unused space it knows about through TRIM, it rearranged the stuff internally in such a way that it shot itself in the foot with regards to those parallel "channels" it has, and one single channel is that atrocious 60 MB/s number or whatever was measured as lowest?
post #80 of 3279
@deepor
I don't know. I edited my post because I had overlooked that the passage was primarily about random reads. Somebody with more knowledge about the internal workings of SSDs might have a theory.

But it seems that the EVO somehow isn't able to read sequential parts of older files in parallel anymore.

I think I will add a feature to the FileBench tool for 'rewriting' files . It will simply read the data and write them back 'at the same place' (same place in the 'logical' OS meaning) in the same file.
Edited by BrainSplatter - 9/7/14 at 12:49pm
Fun
(15 items)
 
AntiAlias
(11 items)
 
 
CPUMotherboardGraphicsRAM
4770K @ 4.5Ghz @ 1.38v delidded Gigabyte GA-Z87X-OC f9c 2 x Zotac 980Ti Amp Omega @1530, @1530 G.SKILL TridentX 2400 CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 256GB 4 x Samsung EVO 850 1TB RAID0 Samsung Blu Ray Cooler Master Seidon 240M 
OSMonitorKeyboardPower
Windows 7 Professional 64 bit Samsung 27" IPS 2560x1440 Logitech Wireless Seasonic Platinum 860 
CaseMouseAudio
NZXT Phantom 630 white Razer ASUS Xonar U7 external 
CPUMotherboardGraphicsGraphics
7700K@5Ghz ASUS ROG STRIX Z270F Asus 1080Ti FE Gigabyte 1080Ti FE 
RAMHard DriveHard DriveOS
Corsair Vengeance LED 32GB (4x 8GB) DDR4 3400MH... Samsung 960 EVO 500GB 4 x 1TB 850 EVO SSD RAID0 Windows 10 Pro 64 Bit 
MonitorPowerCase
LG 27MU67-B 4K BeQuiet Straight Power 10 800W anidees AI-Crystal black 
  hide details  
Reply
Fun
(15 items)
 
AntiAlias
(11 items)
 
 
CPUMotherboardGraphicsRAM
4770K @ 4.5Ghz @ 1.38v delidded Gigabyte GA-Z87X-OC f9c 2 x Zotac 980Ti Amp Omega @1530, @1530 G.SKILL TridentX 2400 CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 256GB 4 x Samsung EVO 850 1TB RAID0 Samsung Blu Ray Cooler Master Seidon 240M 
OSMonitorKeyboardPower
Windows 7 Professional 64 bit Samsung 27" IPS 2560x1440 Logitech Wireless Seasonic Platinum 860 
CaseMouseAudio
NZXT Phantom 630 white Razer ASUS Xonar U7 external 
CPUMotherboardGraphicsGraphics
7700K@5Ghz ASUS ROG STRIX Z270F Asus 1080Ti FE Gigabyte 1080Ti FE 
RAMHard DriveHard DriveOS
Corsair Vengeance LED 32GB (4x 8GB) DDR4 3400MH... Samsung 960 EVO 500GB 4 x 1TB 850 EVO SSD RAID0 Windows 10 Pro 64 Bit 
MonitorPowerCase
LG 27MU67-B 4K BeQuiet Straight Power 10 800W anidees AI-Crystal black 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: SSD
Overclock.net › Forums › Components › Hard Drives & Storage › SSD › Samsung 840 EVO read speed drops on old-written data in the drive