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RadiantDragoon87
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PostPosted: Tue Dec 29, 2015 12:13 am    Post subject: USB 3.0 speeds not quite 300MB/s Reply with quote

Greetings, I hope to answer my question about my issue. I have a USB 3 motherboard but i am only seeing 100MB/s speeds in copying files. I am using EXFat as the File type. I am using an EVO 850 SSD 1 TB copying multiple 10 GB files from a LEXAR 1066 CF card on a USB 3.0 card reader but only seeing about 100 MB/s when i copy using CP command. when i use rsync -- progress i only see about 50 MB/s .

anything to increase copy speeds would be greatly helpful.
what information more would you need for me to assist.

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Yamakuzure
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PostPosted: Tue Dec 29, 2015 7:20 am    Post subject: Reply with quote

The full USB 3.0 speed must be supported by the device.
  • I have a 1TB Corsair USB 3.0 Key, that can do over 250MB/s when copying files off it. Writing is a lot slower of course, but I have seen rates over 180MB/s.
  • A 1TB USB 3.0 HD I use for backups barely reaches 200MB/s reading but can do almost 200MB/s when writing.
  • The SanDisk Ultra 32GB Micro SDHC card I use in my raspberry PI 2 never gets over 120MB/s reading and 50MB/s when writing.


It all depends on the devices you use.

Might be worth reading: 31 USB 3.0 Thumb Drives, Tested And Reviewed
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Anon-E-moose
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PostPosted: Tue Dec 29, 2015 10:47 am    Post subject: Reply with quote

For devices that can use it, UAS will provide a speed boost also.
Both the receiving end (motherboard) and the sending end (what the hd/usb stick/etc is plugged into) need to know about UAS.
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NeddySeagoon
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PostPosted: Tue Dec 29, 2015 10:50 am    Post subject: Reply with quote

RadiantDragoon87,

Welcome to Gentoo.

EXFat will slow things down as its a userspace filesystem.
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TigerJr
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PostPosted: Wed Dec 30, 2015 10:10 am    Post subject: Reply with quote

Bad test is copy from one bus to another, try to test coping from memory to device, this can show to you real device speed bandwidth or dd if=/dev/zero of=/mnt/device0
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szatox
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PostPosted: Wed Dec 30, 2015 6:17 pm    Post subject: Reply with quote

It seems you want to test interface speed. I'd use hdparm -T (AFAIR -T measures disk cache read speed).
You can also test drive read spead with hdparm -t.
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