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Samsung 840 EVO read speed drops on old-written data in the drive - Page 9

post #81 of 3279
Quote:
Originally Posted by BrainSplatter View Post

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.
That'd make your little tool a must have in my programs toolkit folder. I don't really mind rewriting all data on my drive every now and again, I'm barely hitting its rated writing usage anyway, I've got writes "to spare".
This sure is a strange behavior for an SSD, this information should be provided on review sites and other information pools.
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post #82 of 3279
Quote:
Originally Posted by BrainSplatter View Post

Just note that the date listed for those files is 2009 and not the date at which the files have actually been copied onto the SSD. Unfortunately, there doesn't seem to be a way to determine that date for all cases. If the copying transfers the 'modified' and 'created' date from the original files to the new copy on the SSD 'File Bench' will report the wrong date.

    If you copy a file, Windows Explorer transfers only the modified date to the new file, setting the created and accessed date on the new file to the date of the copy operation.  However, if you move a file, the created and modified dates are transferred to the new file, and only the accessed date is set to the date of the move operation.
 
 
    @gino074, thank you for starting this interesting thread.  I have always advocated defragmenting SSDs occasionally (for numerous other reasons), and have measured performance increases at times when doing so (despite all the misled hoopla), but this new twist is very interesting and unexpected to me!  I will keep my eyes open for this phenomenon in the future.
    I wonder if the Crucial MX100 SSD suffers from this as well, since I have always recommended (and used) the 840 EVO over the MX100 because the EVO is faster!
    Another concern is this: If data is getting hard to retrieve after just a short time (causing reduced read speeds), I wonder how long it would take before the SSD would start forgetting data altogether?
 
Edited by Techie007 - 9/7/14 at 10:04pm
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post #83 of 3279
Quote:
Originally Posted by am dew1 View Post

Quote:
Originally Posted by am dew1 View Post

Thanks BS. I'm running that MyDefrag defrag now. When that is done I will do another FileBench test and post the results.

Wow, what a difference!

After MyDefrag:



Before MyDefrag:



I also ran the Samsung Magician benchmark and now things are back where they should be according to it:


    Amazing results.  I wonder how much of that performance improvement is from improved SSD data retrieval speeds versus all those tiny system files being accessed somewhat sequentially instead of randomly because of MyDefrag's organized and sorted defragmentation.  If it is mostly the former (as post #77 suggests), this issue really needs to be looked into!
 

    EDIT: Yes, the speed increase is confirmed to be a result of rewriting ("refreshing") the data on the SSD.  See my thread of benchmark results (mostly from people on this forum) here.
 
Edited by Techie007 - 9/27/14 at 8:03pm
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post #84 of 3279
Quote:
Originally Posted by Techie007 View Post

I wonder how much of that performance improvement is from improved SSD data retrieval speeds versus all those tiny system files being accessed somewhat sequentially instead of randomly because of MyDefrag's organized and sorted defragmentation.

FileBench actually doesn't test files smaller than 1MB so tiny files don't contribute to these numbers.
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post #85 of 3279

I have just restarted my laptop and i can say that my loading times have improved drastically. My Windows 8 boots in 1.5 turns (circle animation) and goes to desktop almost instantly without any hickups.

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post #86 of 3279
Just ran the test on my 840 EVO purchased 12/26/13. This drive was cloned from my HDD.

speed test results are



read time results are



Post defrag results will be posted once they are in (defraging now)
settings i am using are Min 10 max 0

Joe
post #87 of 3279
@5291
Great, thanks for contributing!

If we leave out all the files which are listed with a 2009 year, because that's not the real date the files were written (FileBench can't determine the exact write date for all files because that information is not always provided by Windows), we can see that the dates of the fastest files are between June and September 2014 and that the slowest files are all from January 2014.

So again, it seems that older files are slower to read than newer ones.

It seems that I have to add a log option to FileBench in order to be able to analyze that information more and to have a backup for later. I will also give the option to leave out the directory and file names to avoid any privacy concerns.
Edited by BrainSplatter - 9/8/14 at 3:43am
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post #88 of 3279
Post defrag results are in.



and speed testing


Edit1
all testing has been done without a reboot incase it matters


Edit2
also note that i do NOT Have samsung Magician installed i am doing that now and as i type is popped up that the firmware is out of date.

Edit 3
Post Samsung Magician Firmware update, OS optimization, and Performance optimization.

Edited by 5291Crash - 9/8/14 at 4:11am
post #89 of 3279
@5291Crash

Ok, your average read speed went up from 215 MB/s to 353 MB/s after defragmentation. That's a 55% increase. As u can see, Crystal Diskmark reported essentially the same read results for and after the defragmentation. Interestingly, the write performance increased, especially for smaller block sizes.

Please note that the fact that the defragmentation helps might not be because your files on the SSD were fragmented but because the defragmentation rewrote a lot of files. And since u still seem to have many slow files we can assume that these were not rewritten by the defragmentation because they are not fragmented at all and didn't need to be moved around to create more continuous space.

I hope to add the 'rewrite file' feature to FileBench soon so that we can test whether it helps to bring all files up to speed again.


Regarding the firmware, as far as I have seen so far, updating the firmware doesn't seem to have any effect regarding the 'slow read speed for old files' problem.
Edited by BrainSplatter - 9/8/14 at 4:17am
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post #90 of 3279
I Intend on reinstalling windows in a month or 2, losing all the old files from way back, and junk its accumulated over time.

Its a lucky drive though it survived lightning lol

Yeah, i noticed that the defrag did 7 passes. it was at 11% when it started.

According to samsung magician the drives had total write bytes of 2.39TB
Also to note is "Rapid mode" is not active.

Joe
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