[Bug 156596] [ehci] Extremely high interrupt rate on ehci/uhci IRQ16 80% cpu utilization on CPU0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=156596

--- Comment #17 from Tobias Berner <tcberner at gmail.com> ---
I still have to test it on the system from above (should have time on the
weekend) -- but the patch made no difference on my Lenovo x200:
interrupt                          total       rate
irq9: acpi0                          306          4
irq16: uhci3                    14875930     193324
irq20: hpet0 uhci0                 85546       1112
[...]

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