When I installed Windows 7 x64 Ultimate (before that I used Windows XP x86) I received problem. When I disconnect power cord from my notebook (HP Compaq 8710w) 1 CPU's kernel become very high usage. Even mouse pointer moves with leaps.
I tried to investigate problem with Process Explorer and founded, that DPC loads CPU over 50%.
I continue my investigation and after running
xperf -on latencyxperf -I \kernel.etl -a dpcisrI received next results:
--------------------------
DPC Info
--------------------------
CPU Usage Summing By Module For the Whole Trace
CPU Usage from 0 us to 29476196 us:
CPU 0 Usage CPU 1 Usage
usec % usec % Module
11245 0.04 10371 0.04 ACPI.sys
58 0.00 0 0.00 ADIHdAud.sys
108 0.00 85 0.00 HDAudBus.sys
36 0.00 0 0.00 HTTP.sys
485 0.00 0 0.00 NETIO.SYS
13 0.00 0 0.00 Ntfs.sys
1944 0.01 1699 0.01 SynTP.sys
751 0.00 0 0.00 Wdf01000.sys
1127 0.00 0 0.00 afd.sys
117 0.00 0 0.00 btwaudio.sys
125 0.00 0 0.00 btwavdt.sys
10 0.00 0 0.00 cng.sys
1 0.00 0 0.00 fltmgr.sys
293 0.00 511 0.00 i8042prt.sys
20 0.00 0 0.00 luafv.sys
14832013 50.32 18357 0.06 ndis.sys
302 0.00 0 0.00 netbt.sys
926 0.00 0 0.00 nm3.sys
11413 0.04 6791 0.02 ntoskrnl.exe
41579 0.14 46201 0.16 nvlddmkm.sys
23 0.00 0 0.00 rdbss.sys
111 0.00 168 0.00 sple.sys
28 0.00 14 0.00 srv.sys
2 0.00 0 0.00 srvnet.sys
3916 0.01 103 0.00 tcpip.sys
286 0.00 0 0.00 tunnel.sys
6740 0.02 4550 0.02 "Unknown"
As you can see the problem with standart Network Driver Interface Specification driver (ndis).
Another information:
- Mobile DualCore Intel Core 2 Duo T7700
- Intel Crestline-PM PM965
- 4032 Mb (DDR2 SDRAM)
- NVIDIA Quadro FX 1600M (512 Mb)
- Intel(R) 82566MM Gigabit Network Connection
- Intel(R) Wireless WiFi Link 4965AG
Intel 82566MM Gigabit Network, has "latest" driver (e.g. an effort to update the driver says I'm using the latest one) Intel 9.13.12.0 (05.06.2009)
Intel Wireless WiFi Link 4965AG, "latest" driver (e.g. an effort to update the driver says I'm using the latest one) Microsoft 12.4.1.4 (26.03.2009). WiFi disabled, so problem is not with this driver.
Also installed Microsoft Network Manager 3.3. No other software, firewalls, antiviruses, network hacks or other settings changes installed.
Problem appear randomly if disconnect network cord and after that disconnect power cord (notebook still works on battery). It don't means on what power plan it works. Problem appear on all power plans. Also if problem appear one time it was not solved until hibernate or reboot. I mean, that every time when I disconnect power cord problem appear (when I connect power cord again problem resolves), and I can do this as many times as I want.
Problem solves by hibernate (after unhibernate there is no high CPU usage) or reboot. And appears again randomly.
Now I uninstall Microsoft Network Manager and will try to check if problem solved or not during some time.