Messages in this thread | | | From | Frederik Himpe <> | Subject | 2.6.24-rc3-git3: usb hardware interrupts using 25% of CPU time | Date | Wed, 28 Nov 2007 22:33:18 +0000 (UTC) |
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I installed Linux 2.6.24-rc3-git3 on a PPC based Apple Powerbook G4 system. Now with top I see that over 20% of CPU time is used by hardware interrupts. Looking at /proc/interrupts, the number in the row ohci_hcd:usb1 is rising very quickly:
$ cat /proc/interrupts CPU0 21: 1 MPIC 1 Edge i2sbus: i2s-a (tx) 24: 11008 MPIC 1 Level ide1 25: 33608 MPIC 1 Level VIA-PMU 26: 56 MPIC 1 Level keywest i2c 27: 1 MPIC 1 Edge i2sbus: i2s-a (rx) 29: 281578 MPIC 1 Level ohci_hcd:usb1 30: 0 MPIC 1 Level i2sbus: i2s-a (control) 31: 0 MPIC 1 Level i2sbus: i2s-b (control) 33: 1 MPIC 1 Edge i2sbus: i2s-b (tx) 34: 1 MPIC 1 Edge i2sbus: i2s-b (rx) 39: 41611 MPIC 1 Level ide0 40: 2 MPIC 1 Level ohci1394 41: 0 MPIC 1 Level eth0 42: 0 MPIC 1 Level keywest i2c 47: 2826 MPIC 1 Level GPIO1 ADB 48: 58633 MPIC 1 Level radeon@pci:0000:00:10.0 52: 18961 MPIC 1 Level b43 53: 1 MPIC 1 Level yenta 61: 1 MPIC 1 Edge headphone-detect 63: 0 MPIC 1 Level ohci_hcd:usb2, ohci_hcd:usb3, ehci_hcd:usb4 BAD: 187917
$ lspci -nn 0000:00:0b.0 Host bridge [0600]: Apple Computer Inc. UniNorth 2 AGP [106b:0034] 0000:00:10.0 VGA compatible controller [0300]: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10] [1002:4e50] 0001:10:0b.0 Host bridge [0600]: Apple Computer Inc. UniNorth 2 PCI [106b:0035] 0001:10:12.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller [14e4:4320] (rev 03) 0001:10:13.0 CardBus bridge [0607]: Texas Instruments PCI1510 PC card Cardbus Controller [104c:ac56] 0001:10:17.0 Unknown class [ff00]: Apple Computer Inc. KeyLargo/Intrepid Mac I/O [106b:003e] 0001:10:19.0 USB Controller [0c03]: Apple Computer Inc. KeyLargo/Intrepid USB [106b:003f] 0001:10:1a.0 USB Controller [0c03]: Apple Computer Inc. KeyLargo/Intrepid USB [106b:003f] 0001:10:1b.0 USB Controller [0c03]: NEC Corporation USB [1033:0035] (rev 43) 0001:10:1b.1 USB Controller [0c03]: NEC Corporation USB [1033:0035] (rev 43) 0001:10:1b.2 USB Controller [0c03]: NEC Corporation USB 2.0 [1033:00e0] (rev 04) 0002:24:0b.0 Host bridge [0600]: Apple Computer Inc. UniNorth 2 Internal PCI [106b:0036] 0002:24:0d.0 Unknown class [ff00]: Apple Computer Inc. UniNorth/Intrepid ATA/100 [106b:003b] 0002:24:0e.0 FireWire (IEEE 1394) [0c00]: Apple Computer Inc. UniNorth 2 FireWire [106b:0031] (rev 81) 0002:24:0f.0 Ethernet controller [0200]: Apple Computer Inc. UniNorth 2 GMAC (Sun GEM) [106b:0032] (rev 80)
Full dmesg, .config and lsmod output can be found on http://artipc10.vub.ac.be/linux-2.6.24-rc3-git3/
-- Frederik Himpe
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