From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Fri, 2 May 2014 11:26:35 -0400 To: 9fans@9fans.net Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: [9fans] ehci/uhci interrupts Topicbox-Message-UUID: dc83afb4-ead8-11e9-9d60-3106f5b1d025 it appears that uhci is causing spurious ehci interrupts, or at least ehci/uhci are causing each other to ring. i haven't tracked down the fundamental issue yet. but this appears to be related to the ehci/uhci subordinate issue, and the Callmine setting. hacking details for the interested: when i limit one particular machine to 5 uhci controllers, everything is fine. one suspects that this is luck due to whatever it is that triggers the excitement being connected to the 6th controller. the 6th controller does indeed share an interrupt with ehci. if it were enabled it would be 70.1/10. (nix uses vector.mach notation for /dev/irqalloc. since the amd64 port of the nix kernel has settled on physical interrupt addressing, a machine may have nmach*nvector available vectors.) juno# grep usb /dev/irqalloc 68.0 15 0 0 ioapic usbuhci 68.1 7 0 0 ioapic usbuhci 68.2 11 0 0 ioapic usbuhci 68.2 11 0 0 ioapic usbuhci > 68.3 6 2 11136 ioapic usbehci > 68.3 6 0 0 ioapic usbuhci 70.1 10 0 0 ioapic usbehci - erik