On Wed, 16 Apr 2014, Jeremy Jongepier wrote:
On 04/16/2014 10:51 PM, Len Ovens wrote:
It appears that the USB2 devices have problems with USB3 ports (Like the
1818vsl).
So far I have little issues with my USB2 audio interface (not a 1818VSL)
and the xhci driver. I've come across that thread too and it seems the
issue is specific for the 1818VSL.
It is specific to the Intel Ivy Bridge chipset USB3 implementation. So if
your computer uses a different HW implementation you should be fine. For
example a PCIe card with USB3 ports is ok or a MB that uses different HW.
Intel admits the problem is there but will not fix it and feels that well
written drivers will just ask the USB device for a resend of the missed
packet !!!??? They say that nobody will notice the missing packet
anyway??? I read this to mean "it is in the hardware now and there is no
soft/firmware patch possible." One hopes the 4th gen chips are better
designed. Thats what I am looking to buy. I don't have a USB2 device to
try though.
I should really do some testing how the ehci and xhci drivers compare,
at the moment I'm inclined to think either the USB3 host controllers I
use or the xhci driver performs better with my interface than either
USB2 controllers or the ehci driver.
That is at least good news. I suspect a HW difference in the host off the
top of my head. I think the system pays more attention to them too.
--
Len Ovens
www.ovenwerks.net
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