| [proaudio] 2.6.21-rt9 - IRQ23 using CPU constantly / 2.6.18-rt7 didn't |
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- Subject: [proaudio] 2.6.21-rt9 - IRQ23 using CPU constantly / 2.6.18-rt7 didn't
- From: "Mark Knecht" <markknecht@xxxxxxxxx>
- Date: Sat, 9 Jun 2007 10:14:21 -0700
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Hi all,
Since upgrading to the 2.6.21-rt series kernel I've seen that IRQ 23
is constantly using a small amount of the CPU. This is true in
2.6.21-rt9 (what's the '.3'?) and 2.6.21-rc5-r12.
Before I report this to the kernel mailing list I thought I'd ask here
whether anyone else has seen anything like this? I haven't seen any
discussions myself but I thought it didn't hurt to ask.
This did not happen on 2.6.18-rt7 which is the most recent kernel on
my machine before this new series. That data is show below also.
I have not yet checked the vanilla kernel.
Any ideas or shall I report it?
Thanks,
Mark
mark@lightning ~ $ uname -a
Linux lightning 2.6.21.3-rt9 #1 PREEMPT RT Sat Jun 9 09:49:32 PDT 2007
x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
mark@lightning ~ $
mark@lightning ~ $ top
top - 10:02:17 up 3 min, 2 users, load average: 0.00, 0.00, 0.00
Tasks: 88 total, 2 running, 86 sleeping, 0 stopped, 0 zombie
Cpu(s): 1.3%us, 0.0%sy, 0.0%ni, 95.7%id, 0.0%wa, 3.0%hi, 0.0%si, 0.0%st
Mem: 1026612k total, 190316k used, 836296k free, 8124k buffers
Swap: 2008084k total, 0k used, 2008084k free, 74616k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
947 root -76 -5 0 0 0 S 2.7 0.0 0:05.58 IRQ-23
9533 root 15 0 324m 13m 7420 S 1.3 1.4 0:03.24 X
1 root 15 0 2668 588 500 S 0.0 0.1 0:00.27 init
2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 posix_cpu_timer
3 root -51 0 0 0 0 S 0.0 0.0 0:00.00 softirq-high/0
mark@lightning ~ $ cat /proc/interrupts
CPU0
0: 212 IO-APIC-edge timer
1: 296 IO-APIC-edge i8042
6: 3 IO-APIC-edge floppy
7: 0 IO-APIC-edge lpptest
8: 0 IO-APIC-edge rtc
9: 0 IO-APIC-fasteoi acpi
12: 8690 IO-APIC-edge i8042
14: 62 IO-APIC-edge ide0
16: 0 IO-APIC-fasteoi hdsp
18: 14496 IO-APIC-fasteoi ohci1394, radeon@pci:0000:01:00.0
20: 2 IO-APIC-fasteoi ehci_hcd:usb1
21: 7724 IO-APIC-fasteoi libata
22: 0 IO-APIC-fasteoi libata, NVidia CK804
23: 1739277 IO-APIC-fasteoi ohci_hcd:usb2, eth0
NMI: 0
LOC: 59688
ERR: 0
mark@lightning ~ $
mark@lightning ~ $ uname -a
Linux lightning 2.6.18-rt7 #4 PREEMPT Sun Apr 8 17:32:31 PDT 2007
x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
mark@lightning ~ $
mark@lightning ~ $ top
top - 10:09:51 up 1 min, 2 users, load average: 0.00, 0.00, 0.00
Tasks: 83 total, 1 running, 82 sleeping, 0 stopped, 0 zombie
Cpu(s): 1.7%us, 0.3%sy, 0.0%ni, 95.4%id, 2.6%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1026840k total, 185688k used, 841152k free, 7904k buffers
Swap: 2008084k total, 0k used, 2008084k free, 74172k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9024 root 15 0 324m 13m 7072 S 1.7 1.3 0:01.00 X
7 root -2 0 0 0 0 S 0.3 0.0 0:01.02 softirq-block/0
9912 mark 15 0 10600 1304 960 R 0.3 0.1 0:00.01 top
1 root 15 0 2676 588 500 S 0.0 0.1 0:00.31 init
2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 posix_cpu_timer
3 root -2 0 0 0 0 S 0.0 0.0 0:00.00 softirq-high/0
lightning ~ # lspci
00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a3)
00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97
Audio Controller (rev a2)
00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2)
00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] Miscellaneous Control
01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60
[Radeon X300 (PCIE)]
01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
05:06.0 Multimedia audio controller: Xilinx Corporation RME Hammerfall
DSP (rev 68)
05:08.0 FireWire (IEEE 1394): Texas Instruments TSB82AA2 IEEE-1394b
Link Layer Controller (rev 01)
lightning ~ #