[kwlug-disc] USB 2.0 vs. 3.0 on Linux

[Khalid Baheyeldin]

So, I got two USB disks that support USB 3.0 speeds, and ran some times.

On an older machine that has only USB 2.0 ports, the speeds is as follows:
18.9 MB/s to 19.6 MB/s.

On a machine that has USB 3.0 ports, with both disks connected to the blue
ports, and Ubuntu Server 12.04, the speed was only 59 MB/s.

>From what I read, real tests on USB 3.0 (ignoring the nominal speeds)
should be 10X as fast as USB 2.0, which should be 200 MB/s at least.

So, is it because these are portable disks and the spindle is 5400 RPM? Or
is it a bottleneck somewhere else?

Lori?

-- 
Khalid M. Baheyeldin
2bits.com, Inc.
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