Hello, While checking out the -P option for top in 7.1 I noticed that my desktop at home (which is currently idle) was spending nearly 100% of one core on interrupt:
last pid: 5678; load averages: 0.00, 0.00, 0.00 59 processes: 1 running, 58 sleeping CPU 0: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle CPU 1: 0.0% user, 0.0% nice, 0.8% system, 0.0% interrupt, 99.2% idle CPU 2: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle CPU 3: 0.0% user, 0.0% nice, 0.0% system, 90.3% interrupt, 9.7% idle So I looked at vmstat -i: interrupt total rate irq16: nvidia0 em* 5009831 88 irq18: uhci2 ehci+ 66595 1 irq19: uhci4++ 2855320585 50637 irq22: pcm0 213238 3 irq23: uhci3 ehci1 1 0 cpu0: timer 112447860 1994 cpu1: timer 112444767 1994 cpu3: timer 109457852 1941 cpu2: timer 109457830 1941 Total 3304418559 58602 The interrupt rate for uhci4 seems very high for an idle system. % dmesg | grep uhci4 uhci4: <UHCI (generic) USB controller> port 0xb400-0xb41f irq 19 at device 29.1 on pci0 uhci4: [GIANT-LOCKED] uhci4: [ITHREAD] usb5: <UHCI (generic) USB controller> on uhci4 % dmesg | grep usb5 usb5: <UHCI (generic) USB controller> on uhci4 usb5: USB revision 1.0 uhub6: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb5 usb7: companion controllers, 2 ports each: usb4 usb5 usb6 % usbdevs -v ... Controller /dev/usb5: addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), Intel(0x0000), rev 1.00 port 1 powered port 2 powered Nothing is plugged in there! The only USB devices I have plugged in are: addr 1: EHCI root hub, Intel addr 2: USB2.0 Hub, vendor 0x05e3 addr 3: Microsoft 2.4GHz Transceiver v4.0, Microsoft addr 1: UHCI root hub, Intel addr 2: Generic USB Hub, Chicony addr 3: PFU-65 USB Keyboard, Chicony The receiver for my wireless mouse, which is plugged into a USB hub (this is to fix a different problem where if the receiver is directly plugged into the machine it stops working and FreeBSD complains that it has disabled the USB controller!), and my Happy Hacking keyboard which sits behind its own built-in hub. The machine is: % uname -a FreeBSD tomo.jamesoff.net 7.1-RELEASE FreeBSD 7.1-RELEASE #4: Mon Jan 26 22:16:37 UTC 2009 r...@tomo.jamesoff.net:/usr/obj/usr/src/sys/GENERIC i386 The board is an ASUS P5Q3 with a Q6600 2.4GHz installed. If there is any other information I should supply or debugging I can do, please let me know. /JMS _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"