James Cameron wrote: > On Tue, Sep 08, 2009 at 07:17:30PM -1000, david wrote: > >> USB not sharing interrupts with anything? >> > > Andy's original post contained /proc/interrupts which showed some > sharing was happening. Here's a cut: > > 16: 380396 233180 IO-APIC-fasteoi uhci_hcd:usb4, yenta > 17: 829711 532117 IO-APIC-fasteoi uhci_hcd:usb5, ohci1394, HDA Intel > 18: 0 0 IO-APIC-fasteoi mmc0 > 19: 2 0 IO-APIC-fasteoi ehci_hcd:usb6 > 20: 18 17 IO-APIC-fasteoi uhci_hcd:usb1 > 21: 0 0 IO-APIC-fasteoi uhci_hcd:usb2 > 22: 305246 302929 IO-APIC-fasteoi ehci_hcd:usb3 > > Sharing interrupts adds a tiny delay to interrupt handling; if this has > truly become significant, there's a design issue somewhere else. > > (Shared interrupts with modern kernels are not a huge problem, since the > drivers check to see if the interrupt they have is legitimate before the > kernel chains on to the next driver. It's the waste of that additional > check that people want to avoid.) > > The usb port I'm using is on INT 21 (uhci_hcd:usb2), which doesn't share with anything. andy _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
