Date: Sun, 24 Apr 2011 08:30:16 GMT From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@FreeBSD.org Subject: usb/156596: [ehci] Extremely high interrupt rate on ehci/uhci IRQ16 80% cpu utilization on CPU0 Message-ID: <201104240830.p3O8UGrs099955@freefall.freebsd.org>
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The following reply was made to PR usb/156596; it has been noted by GNATS. From: Hans Petter Selasky <hselasky@c2i.net> To: bug-followup@freebsd.org, daynejordan@gmail.com Cc: Subject: usb/156596: [ehci] Extremely high interrupt rate on ehci/uhci IRQ16 80% cpu utilization on CPU0 Date: Sun, 24 Apr 2011 10:26:52 +0200 Hi, Compile a kernel with: options USB_DEBUG Then enable after boot: sysctl hw.usb.ehci.debug=15 ; sleep 1; sysctl hw.usb.ehci.debug=0 sysctl hw.usb.uhci.debug=15 ; sleep 1; sysctl hw.usb.uhci.debug=0 The high interrupt rate might be caused by a non-cleared IRQ. Else it is an ACPI issue. --HPS
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