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Samsung 840 EVO read speed drops on old-written data in the drive - Page 6

post #51 of 3279
Quote:
Originally Posted by gino074 View Post

just for curiosity I run again the parkdale scan of my EVO drive disabling the CPU power saving and in this case it's hard to see any relevant difference.
Maybe the scan test is demanding more CPU power, keeping CPU always at max frequency. Or maybe parkdale is averaging or compensating the speed measures...
Yeah, not sure why the method I use (simple file open for sequential reading) is so sensitive to the power saving options. For testing, I will put in an option to create another thread to keep the CPU busy to see whether that makes any difference. Since I do almost no calculations during the reading so far, there is almost only disk IO and Win API UI calls.
Quote:
@BrainSplatter: maybe you can improve your software by implementing a file "rewrite" routine for files reading below a threshold, for example rewrite the file if the read speed is below 200MB/sec whistle.gif
Well, lets find more evidence for the problem first. If there is a good case for it I will think about adding a 'rewrite' feature. Although I might be a bit hesitant since there is always the chance of sth going wrong during the rewrite. Atm, it's impossible for the tool to do any damage since it's only reading stuff wink.gif
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post #52 of 3279
So... where does this stand? If these are more or less isolated occurrences, I'll go ahead and grab a big fat EVO for storage the next time they go on sale.
post #53 of 3279
I just ran HD Tach on my 120 GB EVO I installed in late June. Similar results others have posted.

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post #54 of 3279
Quote:
Originally Posted by am dew1 View Post

I just ran HD Tach on my 120 GB EVO I installed in late June. Similar results others have posted.

Forget HD Tach, it's probably not showing the real file read speed (the speed when a program opens and reads a file in Windows).

Please check out my tool which will test the read spead of the files on your SSD (or HD).
Just select a folder to start from and it will benchmark all files in that directory and it's subdirectory.
In addition, you can specify a minimum- and maximum file size in MB (u can't go below 1MB).

FileBench.zip 135k .zip file

After it has run, u can sort the results by various categories like 'read speed', 'file size', 'date last modified' (might be incorrect depending on how it was copied or created originally).
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post #55 of 3279
OK -- here are the results using FileBench which I pointed to C:\ and set the min size to 1 so it would read the entire drive.

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post #56 of 3279
Quote:
Originally Posted by am dew1 View Post

OK -- here are the results using FileBench which I pointed to C:\ and set the min size to 1 so it would read the entire drive.

Great, the result is quite interesting. The average read speed is indeed quite low. And it seems to be similar to what HD Tach found in the used area of the SSD. I didn't expect that, because in my case of my 3 week old 1TB EVO the results of HD Tach on one side and manual copying / the 'File Bench' tool on the other side were quite different (HD Tach was much lower than copying or 'File Bench').

After you have run the 'File Bench' you can sort the files by 'Date'. It would be interesting to see whether the newest files are much faster on compared to the oldest files. You need to check this manually just by looking at the results of the individual files after you have sorted by newest and latest 'Date'.
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post #57 of 3279
Here are my results with that "File Bench" program on a partition where I install large programs and games. I've set minimum size to 100 MB so that it goes faster and it still took ten minutes. The drive is a Samsung SSD 840 at 250 GB size (not EVO... it is the predecessor, the first drive with TLC).

Virus scan (Click to show)
File Bench result (Click to show)
sorted by date (Click to show)

sorted by speed (Click to show)

post #58 of 3279
Here are my results sorted by date and speed:
Date (Click to show)

Speed (Click to show)

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post #59 of 3279
Worse min speeds than mine. biggrin.gif(EDIT: Nevermind! That difference was caused by the 1 MB min size vs. 100 MB min size setting. It's also as low as 20 MB/s for me if I let it search for 1 MB sized files.)

I tried running that optimization thingy in Samsung Magician, but no change.
Edited by deepor - 9/6/14 at 11:55am
post #60 of 3279
Quote:
Originally Posted by deepor View Post

Here are my results with that "File Bench" program on a partition where I install large programs and games.

Oh wow, that indeed shows that much older files are almost always much slower than newer files.

And I will look into that Adware detection from some tools. It's probably a false positive since I don't include any adware or other stuff. Thanks for the info!

@am dew1

Thanks, your results also show the older files being much slower.

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.


Update regarding that Adware detection. It was a false positive. I checked the debug version with your tool and it was clean. So I just changed some compiler optimization settings and now the release version also shows no alerts anymore.
FileBench.zip 135k .zip file


@deepor and @am dew1
Since your old files are much slower, you could try something out. In a German thread (in German) about the some problem the thread creator used a specific defragmentation tool to supposedly get his files up to speed again. At least according to HD Tune. The tool is called MyDefrag and the optimization he used was Data Disk Monthly

I know that defragmenting a SSD is not recommended in general since it creates many writes and usually doesn't influence SSD speed. But since we seem to have found a special problem with the EVO SSDs, it could be worth to try it out and to see whether it helps.
Edited by BrainSplatter - 9/6/14 at 12:14pm
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