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SSD transfert rate issue in use, but not in test

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pierre_A
Posts: 26
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Location: Digne les bains, France

SSD transfert rate issue in use, but not in test

#1 Post by pierre_A »

Hi,

I have an old 128GB SSD that i use as an external drive in a eSATA case.

When I copy a lot of data on it, after some time, the transfer rate drops below 1 MBps, just like if the cache would be full.
If i launch a test using the disk program in Gnome3, the transfert rate is 200 MBps read / 120MBps write, even with a hundred 1000MB samples.

What is happening ?

peter_irich
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Re: SSD transfert rate issue in use, but not in test

#2 Post by peter_irich »

Try copy one big file by size 1GB or more and compare result.

Peter.

pierre_A
Posts: 26
Joined: 2005-06-10 19:47
Location: Digne les bains, France

Re: SSD transfert rate issue in use, but not in test

#3 Post by pierre_A »

Code: Select all

time cp big1700MBfile mySSD

real	0m15,065s
user	0m0,008s
sys	0m1,092s
That's about 110MBps

I think the problem happen when transfering a lot of small files.

The SSD is software encrypted, don't know if this is important.

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pawRoot
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Re: SSD transfert rate issue in use, but not in test

#4 Post by pawRoot »

Not sure about your issue but when i encrypt my SSD via Debian installer, the system is much less responsive.

pierre_A
Posts: 26
Joined: 2005-06-10 19:47
Location: Digne les bains, France

Re: SSD transfert rate issue in use, but not in test

#5 Post by pierre_A »

The SSD is encrypted using LUKS.

All my laptops are encrypted, I haven't noticed any performance issues (although the CPU is much less powerful on laptops than on the desktop i am using with the external drive)

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