Actual speed on the usb 2 port

[tech291083]

Hi,

Is there any way one can write a small program C++, Java etc) to know what is the actual speed on the usb 2 port on the system with Fedora on it? As per the technical specs, it has to be 480 Mbps. But in real world it depends upon the quality of the hardware in question such as a usb pen drive of 2 GB storage capacity. Thanks…

[cgasmith]

A quick and dirty way to check it out is to write a simple shell script to
copy a 600mb file to the device under test. (480mbps = 60mBytes/s) so it should take 10seconds give or take. The bigger the file, the less the impact of cache. Of course, you should not be disappointed by lower calculated times as the spec refers to the usb primary device to the first point, hubs, cables, bridges and system divers induce limits. A flash device will be painfully slow, compared to a buffered usb hard-drive sub-system (no, not the usb-ide cheapy conntrollers, more like the ones that are usb/1394/ethernet nas)

Good Luck

[Hosanaa]

fine !!
Its the great information !