On 08/18/2012 01:38 PM, Skunk Worx wrote:
Hi,
I have two similar linux machines with legacy PCI / USB 3.0 cards plugged in. These use the NEC uPD720200 USB 3.0 Host Controller and the xhci module.
<snip>
Is it likely that the kernel option is what's dropping the USB 3.0 performance to about 1/2 speed?
Solved, replying for completion. The supposed USB 3.0 extension cable was dropping the speed. Going direct to the port raised the speed to about 85 MB/sec.
--- John