Java thread with high CPU usage

Hi,
Running prstat -L -p pid on Solaris produces a list of lwp threads running in that process that are consuming the most CPU. Out of about 7 threads that were associated with kernel threads in pstack output, only 5 of them were mapped to a JVM thread dump. How is it possible to have a Java thread consuming CPU that doesn't show up in a thread dump?
Thanks,
J.S.

And, any idea what this thread is doing?
Here's pstack output for this missing thread 12:
----------------- lwp# 18 / thread# 12 --------------------
fe0e48b4 __1cHCompileSflatten_alias_type6kMpknHTypePtr__3_ (b6001780, 100360, fe4c8000, b6001780, 100360, 0) + 4d8
fe0f42ac __1cHCompilePget_alias_index6kMpknHTypePtr__I_ (b6001780, 100360, b6001264, 7e2bb8, 41f4, 7e2bb8) + 8
fe11131c __1cJStoreNodeFIdeal6MpnIPhaseGVN_pnLPhaseDefUse__pnENode__ (0, 7dd5b4, 5035ec, 7e2bb8, b6001144, b6001264) + 128
fe0c1224 __1cMPhaseIterGVNNtransform_old6MpnENode__2_ (0, b6001144, 7e2bb8, b6001264, 7e2bb8, b600116c) + 47c
fe17349c __1cMPhaseIterGVNIoptimize6M_v_ (24, 0, a37700, b6001110, b6001100, 3442f0) + b4
fe1943b0 __1cOPhaseIdealLoop2t6MrnMPhaseIterGVN_pk0_v_ (b6000ee8, a3772c, 1, 4ff37c, 2000, 269568) + 7cc
fe1cc89c __1cHCompileIOptimize6M_v_ (b6001780, b60015b8, b6001780, b60015dc, 0, b60013dc) + a0
fe1cb69c __1cHCompile2t6MpnFciEnv_pnHciScope_pnIciMethod_ill_v_ (91f504, b6001800, db8a24, fe5296b4, b60018a0, b60018b0) + 7bc
fe1c73f8 __1cKC2CompilerOcompile_method6MpnFciEnv_pnHciScope_pnIciMethod_il_v_ (27b18, b6001af8, db8a24, db8938, ffffffff, 1) + 70
fe1c79fc __1cNCompileBrokerZinvoke_compiler_on_method6FpnLCompileTask__v_ (db8938, db8a24, fe4eacec, 0, 0, 8d9) + 40c
fe280964 __1cNCompileBrokerUcompiler_thread_loop6F_v_ (28758, 13a570, fe4c8000, b6001d10, fe4c8000, ffffffff) + 168
fe216200 __1cKJavaThreadDrun6M_v_ (b5e02000, fe4d3e34, fe4c8000, 1ffd70, 13a570, 1ffd70) + 3d8
fe213ec8 _start (fe4c8000, ff325d10, 0, 5, 1, fe401000) + 20
ff36b734 threadstart (13a570, 0, 0, 0, 0, 0) + 40

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Having Issues with High CPU Usage with fluxbox & pekwm

Greetings,
I have searched for this issue and it seems that something similar has happened in the past with an old xorg, and it seems that someone is having a similar issue that they can point to kde as being the culrpit. However in my case, this is a fresh install and is not using any kde libs. Please allow me to explain the issue.
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So I checked out some lighter browsers. I tried both Midori and Iron (which is similar to Chrome but without google spyware or whatever). Well both run better than firefox, Midori being the lightest one, but Iron quickly being my favorite. Still, the problem remained. Moving windows caused cpu spikes, opening more than one tab, or more than one program caused cpu spikes and the computer to slow down and sputter, freezing at times.
So I tried out another wm, fluxbos, which is another of my favorites. Seemed somewhat better but only fractionally, which I consider odd because pekwm has always seemed snappier than fluxbox to me in the past. Running lxtask (still mouse dependent, sorry lol), I was able to take note of the following...
FLUXBOX
lxtask 6% CPU usage average
PCManFM 5% CPU Average
Fluxbox 1% to 2% cpu usage
gksu 3% cpu usage
pidgin 3% to 7% cpu usage
firefox up to 62% cpu usage
midori up to 38% cpu usage
iron up to 50% cpu usage
mpd 11% cpu uage
Xorg (with no window movement) 2% cpu usage
Xorg (moving windows around) up to 80% cpu usage
PEKWM
lxtask 6% CPU
pidgin 7% cpu
tint2 1% cpu
pekwm 1% to 5% cpu
pcmanfm 7% cpu
firefox up to 85% cpu
python 1% cpu
midori up to 38% cpu
iron up to 25% cpu (odd...)
Xorg (with no window movement) 1% cpu
Xorg (when moving windows around) up to 80% cpu
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# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder63) Thu Jun 25 18:57:07 PDT 2009
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30.0 - 110.0
VertRefresh 50.0 - 150.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1600x900" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Here's some specs on this computer, including video cards and such...
Computer
Summary
Computer
Processor Intel(R) Pentium(R) 4 CPU 1.60GHz
Memory 1034MB (239MB used)
Operating System Arch Linux
User Name mythus (Travis K. Randall)
Date/Time Thu 08 Oct 2009 05:24:52 PM CDT
Display
Resolution 1600x900 pixels
OpenGL Renderer GeForce2 MX/AGP/SSE2
X11 Vendor The X.Org Foundation
Multimedia
Audio Adapter ICH - Intel 82801BA-ICH2
Input Devices
Macintosh mouse button emulation
AT Translated Set 2 keyboard
Power Button
Power Button
PC Speaker
Logitech USB Optical Mouse
Printers
No printers found
SCSI Disks
ATA ST3160212A
ATA IC35L090AVV207-0
LITE-ON LTR-16102B
TSSTcorp CD/DVDW TS-H552D
Operating System
Version
Kernel Linux 2.6.30-ARCH (i686)
Compiled #1 SMP PREEMPT Wed Sep 9 12:37:32 UTC 2009
C Library GNU C Library version 2.10.1 (stable)
Default C Compiler GNU C Compiler version 4.4.1 (GCC)
Distribution Arch Linux
Current Session
Computer Name norova
User Name mythus (Travis K. Randall)
Home Directory /home/mythus
Desktop Environment Unknown (Window Manager: Fluxbox)
Misc
Uptime 11 hours, 38 minutes
Load Average 0.20, 0.38, 0.34
Kernel Modules
Loaded Modules
ipv6 IPv6 protocol stack for Linux
reiserfs ReiserFS journaled filesystem
usbhid USB HID core driver
hid
arc4 ARC4 Cipher Algorithm
ecb ECB block cipher algorithm
snd_seq_dummy ALSA sequencer MIDI-through client
rt2500pci Ralink RT2500 PCI & PCMCIA Wireless LAN driver.
snd_seq_oss OSS-compatible sequencer module
rt2x00pci rt2x00 pci library
snd_seq_midi_event MIDI byte <-> sequencer event coder
rt2x00lib rt2x00 library
snd_seq Advanced Linux Sound Architecture sequencer.
led_class LED Class Interface
snd_seq_device ALSA sequencer device management
input_polldev Generic implementation of a polled input device
mac80211 IEEE 802.11 subsystem
snd_intel8x0 Intel 82801AA,82901AB,i810,i820,i830,i840,i845,MX440; SiS 7012; Ali 5455
uhci_hcd USB Universal Host Controller Interface driver
snd_pcm_oss PCM OSS emulation for ALSA.
fan ACPI Fan Driver
cfg80211 wireless configuration support
ppdev
ehci_hcd USB 2.0 'Enhanced' Host Controller (EHCI) Driver
snd_mixer_oss Mixer OSS emulation for ALSA.
snd_ac97_codec Universal interface for Audio Codec '97
nvidia
lp
eeprom_93cx6 EEPROM 93cx6 chip driver
parport_pc PC-style parallel port driver
ohci1394 Driver for PCI OHCI IEEE-1394 controllers
parport
psmouse PS/2 mouse driver
ac97_bus
ieee1394
serio_raw Raw serio driver
8139too RealTek RTL-8139 Fast Ethernet driver
e100 Intel(R) PRO/100 Network Driver
snd_pcm Midlevel PCM code for ALSA.
pcspkr PC Speaker beeper driver
battery ACPI Battery Driver
8139cp RealTek RTL-8139C+ series 10/100 PCI Ethernet driver
snd_timer ALSA timer interface
i2c_core I2C-Bus main module
iTCO_wdt Intel TCO WatchDog Timer Driver
mii MII hardware support library
evdev Input driver event char devices
snd Advanced Linux Sound Architecture driver for soundcards.
ac ACPI AC Adapter Driver
iTCO_vendor_support Intel TCO Vendor Specific WatchDog Timer Driver Support
usbcore
soundcore Core sound module
sg SCSI generic (sg) driver
shpchp Standard Hot Plug PCI Controller Driver
snd_page_alloc Memory allocator for ALSA system.
processor ACPI Processor Driver
thermal ACPI Thermal Zone Driver
pci_hotplug PCI Hot Plug PCI Core
intel_agp
button ACPI Button Driver
agpgart AGP GART driver
rtc_cmos Driver for PC-style 'CMOS' RTCs
rtc_core RTC class support
rtc_lib
ext4 Fourth Extended Filesystem
mbcache Meta block cache (for extended attributes)
jbd2
crc16 CRC16 calculations
sr_mod SCSI cdrom (sr) driver
cdrom
sd_mod SCSI disk (sd) driver
ata_piix SCSI low-level driver for Intel PIIX/ICH ATA controllers
ata_generic low-level driver for generic ATA
pata_acpi SCSI low-level driver for ATA in ACPI mode
libata Library module for ATA devices
floppy
scsi_mod SCSI core
Display
Display
Display
Resolution 1600x900 pixels
Vendor The X.Org Foundation
Version 1.6.3.901
Monitors
Monitor 0 1600x900 pixels
Extensions
BIG-REQUESTS
Composite
DAMAGE
DOUBLE-BUFFER
DPMS
DRI2
GLX
Generic Event Extension
MIT-SCREEN-SAVER
MIT-SHM
NV-CONTROL
NV-GLX
RANDR
RECORD
RENDER
SECURITY
SHAPE
SYNC
X-Resource
XC-MISC
XFIXES
XFree86-DGA
XFree86-VidModeExtension
XINERAMA
XInputExtension
XKEYBOARD
XTEST
XVideo
OpenGL
Vendor NVIDIA Corporation
Renderer GeForce2 MX/AGP/SSE2
Version 1.5.8 NVIDIA 96.43.13
Direct Rendering Yes
Processor
Processor
Processor
Name Intel(R) Pentium(R) 4 CPU 1.60GHz
Family, model, stepping 15, 1, 2 (Pentium 4)
Vendor Intel
Configuration
Cache Size 256kb
Frequency 1594.77MHz
BogoMIPS 3190.44
Byte Order Little Endian
Features
FDIV Bug no
HLT Bug no
F00F Bug no
Coma Bug no
Has FPU yes
Cache
Cache information not available
Capabilities
fpu Floating Point Unit
vme Virtual 86 Mode Extension
de Debug Extensions - I/O breakpoints
pse Page Size Extensions (4MB pages)
tsc Time Stamp Counter and RDTSC instruction
msr Model Specific Registers
pae Physical Address Extensions
mce Machine Check Architeture
cx8 CMPXCHG8 instruction
apic Advanced Programmable Interrupt Controller
sep Fast System Call (SYSENTER/SYSEXIT)
mtrr Memory Type Range Registers
pge Page Global Enable
mca Machine Check Architecture
cmov Conditional Move instruction
pat Page Attribute Table
pse36 36bit Page Size Extensions
clflush Cache Line Flush instruction
dts Debug Store
acpi Thermal Monitor and Software Controlled Clock
mmx MMX technology
fxsr FXSAVE and FXRSTOR instructions
sse SSE instructions
sse2 SSE2 (WNI) instructions
ss Self Snoop
ht HyperThreading
tm Thermal Monitor
up smp kernel running on up
pebs Precise-Event Based Sampling
bts Branch Trace Store
Memory
Memory
Total Memory 1034084 kB
Free Memory 94276 kB
Buffers 40536 kB
Cached 700112 kB
Cached Swap 0 kB
Active 170788 kB
Inactive 726844 kB
Active(anon) 74112 kB
Inactive(anon) 88348 kB
Active(file) 96676 kB
Inactive(file) 638496 kB
Unevictable 12 kB
Mlocked 12 kB
High Memory 139144 kB
Free High Memory 252 kB
Low Memory 894940 kB
Free Low Memory 94024 kB
Virtual Memory 2931852 kB
Free Virtual Memory 2931852 kB
Dirty 12 kB
Writeback 0 kB
AnonPages 156996 kB
Mapped 57392 kB
Slab 24260 kB
SReclaimable 18864 kB
SUnreclaim 5396 kB
PageTables 1376 kB
NFS_Unstable 0 kB
Bounce 0 kB
WritebackTmp 0 kB
CommitLimit 3448892 kB
Committed_AS 404212 kB
VmallocTotal 122880 kB
VmallocUsed 27648 kB
VmallocChunk 52368 kB
DirectMap4k 32760 kB
DirectMap4M 876544 kB
Benchmarks
CPU Blowfish
CPU Blowfish
This Machine 1595 MHz 50.176
Intel(R) Celeron(R) M processor 1.50GHz (null) 26.1876862
PowerPC 740/750 (280.00MHz) (null) 172.816713
CPU CryptoHash
CPU CryptoHash
This Machine 1595 MHz 11.071
CPU Fibonacci
CPU Fibonacci
This Machine 1595 MHz 74.202
Intel(R) Celeron(R) M processor 1.50GHz (null) 8.1375674
PowerPC 740/750 (280.00MHz) (null) 58.07682
CPU N-Queens
CPU N-Queens
This Machine 1595 MHz 132.704
FPU FFT
FPU FFT
This Machine 1595 MHz 104.630
FPU Raytracing
FPU Raytracing
This Machine 1595 MHz 212.639
Intel(R) Celeron(R) M processor 1.50GHz (null) 40.8816714
PowerPC 740/750 (280.00MHz) (null) 161.312647
So what I am wanting help with is finding the solution to the cpu usage so that I can use this computer at least until I can afford a new power supply or whatever. I am open to any good suggestions, though I must state I am not really interested in tiling wm's at the moment. I am just not a true minimalist.
Thanks in advance for any and all help. I understand that there is a lot of info in this post, but it is my hope that with this info the problem can be solved. If there is info I didn't provide that is needed, please let me know.

also check that you have
session.screen0.opaqueMove false
in your .fluxbox/init this will probably help a bit if it is currently true,
Last edited by Cyrusm (2009-01-26 13:52:13)

Constant SBBOD with high cpu usage

Hi
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Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy – do not type – the following line into the Terminal window, then press return:
chmod -R -N ~
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When the recovery desktop appears, select Utilities ▹ Terminal from the menu bar.
In the Terminal window, enter “resetpassword” (without the quotes) and press return. A Reset Password window opens.
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Timer-thread with xtreme cpu usage

Hi,
I have a loop which looks like this
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Hi,
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I tried safe mode, I tried disabling their add-ins, I tried deleting their terminalserver profile to no avail.
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Hi,
Anti Virus email scanners are known to cause similar behavior, please first check if you have any Anti Virus scanner integrated with Outlook. Try to disable it, and check result.
A corrupted data file might also cause this kind of issue, try to repair your data file with Scanpst.exe tool.
Please refer to this article on how to use scanpst.exe:
http://office.microsoft.com/en-us/outlook-help/repair-outlook-data-files-pst-and-ost-HA102749454.aspx
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http://answers.microsoft.com/en-us/office/forum/officeversion_other-outlook/constant-high-cpu-usage-when-outlook-open/b9a66791-ab73-4ecd-a73d-edf27102aa4e
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Thanks,
Ethan Hua CHN
TechNet Community Support

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Hello,
We have recently implemented SCCM 2012 R2 in a mixed Windows \ Solaris \ RHEL environment. The Unix\Linux client are at the SCCM 2012 R2 CU2 - Version
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expeditiously
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Regards, Chris

Hi Chris,
Yes, the latest Clients Clients Clients including bug fixes and added support for RHEL 7, CentOS 7, and Oracle Linux 7
Please apply the fix and see how it goes.
http://www.microsoft.com/en-us/download/details.aspx?id=39360
Thanks.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

High cpu usage after a while

Sometimes, after a while, firefox (36.0.4) uses up 1 core of my CPU (is a quad core due to hypertreading). The way it happens is really strange. Many tabs without a problem until suddenly ff decides to floor it. This is alway in the run, not on startup or close. All add-ons need to ask my permissions to be activated, this includes flash.
On close, I ordered ff to clear all history and cookies.
Notes that could be important (The behavior encountered while using it. This varies from time to time):
opening new tabs (a lot or a few) => "heavy" load during site loading, then idling
==> The above makes sense
- same as above but load continues to be heavy. => could be some badly written javascript on the site, however, sometimes this occurs with sites I know have no stressful javascript
==> The above seems odd
- Browser is idle in the background (not actively using it). Then all of the sudden "lets floor it until closed".
==> The above seems pretty odd
- When confronted with high CPU usage, closing ff doesn't close it (the ff process remains active. Not a ff process, THE ff process). => High CPU usage remains
==> The above looks like that there is definitely something wrong here
This last one has some other things to keep in mind
- When it happens and I close ff, upon restarting it it will ALWAYS ask to close ff. After confirming to close it, it will start and behave normally.
- When killing ff via the task-manager, or other means like powershell commands, restarting it will result in an idle ff even after every tab is loaded again.
I hope this isn't a heisenbug and there is a solution to this, a reboot ff button would be a nice workaround though. I personally think that it must be some routine in the code that decides to go nuts for no reason.
If you need further details, feel free to ask.
Thanks in advance

Tried those before and tried them again. Unfortunately, the problem keeps repeating itself at random times. As said, sometimes it doesn't occur and sometimes suddenly it does. Keep the following things in mind about this, what seems like a heisenbug, behavior.
- opening new tabs (a lot or a few) => "heavy" load during site loading, then idling
==> The above makes sense
- same as above but load continues to be heavy. => could be some badly written javascript on the site, however, sometimes this occurs with sites I know have no stressful javascript
==> The above seems odd
- Browser is idle in the background (not actively using it). Then all of the sudden "lets floor it until closed".
==> The above seems pretty odd
- When confronted with high CPU usage, closing ff doesn't close it (the ff process remains active. Not a ff process, THE ff process). => High CPU usage remains
==> The above looks like that there is definitely something wrong here
As stated, a reboot ff button would be a nice workaround. I personally think that something like a tread must get stuck in some sort of infinite loop. Browsing in ff works just fine though. I just don't like the fact that I turns into a "gasoline guzzler".
Again, thanks in advance

High CPU Usage on C6509

Good day, can someone analyze this for me, in regards with high cpu usage.
2222222222222222222222222222222222333332222244444222222222
     8888555559999955555777773333344444000007777711111555559999
100
90
80
70
60
50
40                                              *****
30 ************************          ************************
20 **********************************************************
10 **********************************************************
    0....5....1....1....2....2....3....3....4....4....5....5....
              0    5    0    5    0    5    0    5    0    5
               CPU% per second (last 60 seconds)
     4443333334443433334333333333333333333333343333333333333333
     1006530591135079734601132535328062177773414263667168577916
100
90
80
70
60
50
40 ***** ********** **     * * * * **** * * *** ****** *
30 #############**##*####*#*##*###*#*#########*##*****###****
20 ##########################################################
10 ##########################################################
    0....5....1....1....2....2....3....3....4....4....5....5....
              0    5    0    5    0    5    0    5    0    5
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%
     4744444545444444444444444444333344444444444444444434444444433344344444
     4547425182436632379924402500899822115303104140406471591734499730802883
100
90
80   *
70   *
60   *
50   * * **** **   ***     *          *           *   ** *           **
40 **********************************************************************
30 #*******###**********##**********#********************************####
20 ######################################################################
10 ######################################################################
    0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
              0    5    0    5    0    5    0    5    0    5    0    5    0
                   CPU% per hour (last 72 hours)
                  * = maximum CPU%   # = average CPU%
Local_Backbone#sh proc cpu sorted 5sec
CPU utilization for five seconds: 24%/16%; one minute: 27%; five minutes: 27%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
123 1380698152 938782622       1470 6.07% 6.66% 6.52%   0 IP Input
   9    71590456 190912340        374 0.39% 0.48% 0.47%   0 ARP Input
213    53552228 246488976        217 0.23% 0.42% 0.48%   0 SNMP ENGINE
176     2804332 35409778         79 0.15% 0.02% 0.00%   0 OSPF Hello
319      918144 11719407         78 0.15% 0.01% 0.00%   0 OSPF Router 100
   4         236       195       1210 0.07% 0.00% 0.00%   1 Virtual Exec
169     2374788   2035919       1166 0.07% 0.03% 0.00%   0 Adj Manager
118     5885520 15709517        374 0.07% 0.07% 0.07%   0 CDP Protocol
36       69788   9934569          7 0.07% 0.00% 0.00%   0 TTY Background
179    30669516 309965501         98 0.07% 0.23% 0.24%   0 IP SNMP
need a quick opinion as i have another backbone abroad that uses only 5-10% of cpu usage.
- same config
- same setup (2BB for Sec/firewall, 2BB for Integration, 6Distro SW)
- different number of users
thank you and god bless.

I also agree with Stephan that this is not a concern that the cpu you are seeing it sohuld reduce down.
If in case still want to do the troubleshooting here is the procedure:
Here are some of the commands you can refer while you see the high cpu:
•1- Show proc cpu sorted | ex 0.00% >> First check whether CPU is due to Interrupt or due to Process Switching.
Eg: CPU utilization for five seconds: 6%/2%; one minute: 2%; five minutes: 2%
6% is total CPU utilization and 2 % is due to Interrupt. You would see this on a higher bit when you have the high cpu. Total-interrupt will give you the value of Process.
More info: http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00804916e0.shtml
b) Show proc cpu history :---Check since how long is the CPU been affected.
2- Check if there is any interface drops are been seen:
show interface | include line|drops   ( Check if any vlan/interface are having input drops)
3- check if there are any STP issue:
show spanning tree detail
show spann det | in ieee|from|occur|is exec
show spann det | in executing | changes
show interface | include line|drops
show cef drop
show ip traffic   >> Check the traffic utilization.
4- There are some internal debugging which would help to find out which packets ( from Src,dst) is hitting the CPU:
debug netdr capture rx <<<<( DEBUG OF NETDR IS VERY USEFULL TO CHECK WHAT PACKETSS ARE COMING TO CPU)
show netdr capture-packet >> This will give you the captured outputs were you can see the Src and dst . Then you can take the action with those src ip address guys to check why they are punting the traffic.
HTH
Regards
Inayath
***Plz rate if this info is helpfull.

DNS server process, high CPU usage

Hello,
I am having a problem with high CPU usage on DNS process. We have 1921 setup in network of about 100 workstations that use it as DNS server. It also performs split view functionality for couple of domains in order to avoid hairpin NAT. I know that a router is not fit for heavy server duty but such setup was unfortunately necessary.
In peak work hours we oftenly have CPU hitting 100% with DNS server process being the root cause,and on several occasions we had DNS process stuck in such state for prolonged periods of time during which other router functions were affected (t's a default gateway, IPsec concentrator etc.). Sometimes shutting the process and restarting it would solve the problem, but once it required a full reload in order to restore functionality (such was the description that engineer on duty reported to me).
Forwarder queue statistics:
Current size = 0
Maximum size = 86
Drops        = 0
IOS upgrade did not help, we are currently running 15.2(2)T.
The question is ... is such behaviour (CPU load) to be expected on LAN with 100 workstations due to slow CPU on router or we have bugged IOS DNS server (requiring a TAC case)?
The previous solution seem to do this functionality quite nicely (even though it was also a router), so I am not inclined to think that we are dealing with someone DoS-ing the DNS (WAN access to DNS is of course forbidden)
P.S.
Since we moved servers off the routers DNS, we do not receive complaints, but we had a couple of unresolved messages a day while mail server was using router for DNS. I am suspecting that an old bug where IOS DNS servers occasionaly sends clients back empty DNS replies (properly formatted message but without A record) could be still around?

hi,
i have the same problem on UC540 and 2911 on IOS 15.0.1. CPU high, router crashed. Reboot helps but until CPU usage spikes again. the only fix is to remove "ip dns server" from config and use a different DNS server
                    111                       1111    1111111111
          999999999900077777777799999777778888000099990000000000
    322222111119999900077776666622222111119999000088880000000000
100            ********                       ******************
90       *************         *****     **********************
80       ***************************     **********************
70       ******************************************************
60       ******************************************************
50       ******************************************************
40       ******************************************************
30       ******************************************************
20       ******************************************************
10       ******************************************************
   0....5....1....1....2....2....3....3....4....4....5....5....6
             0    5    0    5    0    5    0    5    0    5    0
               CPU% per second (last 60 seconds)
after removed IP dns server
                                       111
                             99999999990007777777779999977777888
              33333333332222211111999990007777666662222211111999
100                               ********
90                          *************         *****     ***
80                          ***************************     ***
70                          ***********************************
60                          ***********************************
50                          ***********************************
40                          ***********************************
30                          ***********************************
20                          ***********************************
10                          ***********************************
   0....5....1....1....2....2....3....3....4....4....5....5....6
             0    5    0    5    0    5    0    5    0    5    0
               CPU% per second (last 60 seconds)

Continuous Audio, Jerky Video, High CPU Usage

Hello,
I've been browsing the forum for a while and tried a few searches. I found some problems similar to mine, but nothing with a solution that worked. Here is my situation. I was running Windows XP Home SP3 with the latest IE, Firefox and Chrome browsers. I updated my flash player (to 10) and I hulu didn't work any more. The audio would play but the video would freeze and change to a different frame every now and then, usually a couple minutes behind the audio. I had already decided that I wanted to switch over to Ubuntu 10 so I just did a fresh install. I updated everything over night and then I tried to watch hulu using the latest firefox. I had the same problem. The audio will play, but the video freezes. I downloaded the latest Chrome. Same problem, both with high cpu usage. I am using a Dell Inspirion 2200 with 1.5 ghz cpu and 512 mb ram with integrated graphics. So far the only thing I've tried is disabling hardware acceleration. My internet connection is 1.5 mb. I would really appreciate any help.
Thanks,
ralphcholo

I noticed it's the "audiodg.exe" program that is acting weird with high cpu usage. Some tutorials say to disable 'audio enhancements' but I can't find that option available in windows 10. In device manager, I notice 2 separate audio drivers. The Acer download page only has 1 realtek audio driver. I'm wondering if there is supposed to be another driver to update? My audio seems to be working fine without this problem coming back. I've attached a screenshot showing the 2 different audio fields in device manager. The bottom one is the driver listed on the Acer driver page, I'm not sure where the other upper audio driver is to download.

High cpu usage when the system is idle

I do have a high cpu usage problem when the system is idle. I bought the laptop (lenovo x230 tablet) with windows 7 installed in it. Then upgraded to windows 8. But ever since I have problems with high cpu usage by the system even when the computer is idle.
Only the system by itself uses around 30% of the cpu all the time. I ran xperf, and here is the result of it:
http://sdrv.ms/Kj6CFN
I appreciate any help you can provide.
Thanks,

Hi,
I'm sorry for that the log you provide can't be opened on my computer. While according to your description, it should had a special process that consume CPU usage when system idle Iguess, isn't it?
You can use
Process Explorer to monitor the process activity, may be we can find the reason of this problem.
Note: We can use Process Explorer to check the Stack of every process then analyize the problem in deep.
To gave a better insight about this problem, you can take a ScreenShot for this problem and provide the picture here.
Roger Lu
TechNet Community Support

Opera and high cpu usage

Hello all!
I have this annoying problem with opera.
After 1-2 hours of running opera cpu usage jumps to about 60-80%. To stop this I have to close opera and restart it.
I mostly have about 30+ tabs opened, but this shouldn't affect the cpu usage. It didn't in the past. I used the opera-devel-qt4 (10.20_4744-1) package from AUR and now I switched back to the "default" opera (10.10-2) package.
This started some days ago, and i cannot find out what causes this.
Any suggestions?
Vlad
Last edited by DonVla (2010-01-07 22:37:58)

I have no plugins running and killed the wrapper.
However it worked fine for the most time. I noticed opera has a higher usage than firefox. But now it's barely usable. Every 3-5 hours I have to stop and then restart opera. With the bundled version it's a little better. But it still freezes for some seconds with high cpu usage.

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