http://bugzilla.kernel.org/show_bug.cgi?id=7766
Summary: cpu hotplug doesn't work properly on dual core procesor,
possibly powernow-k8 specific
Kernel Version: debian stock kernel 2.6.18-3-k7, compiled kernel
2.6.19.1 pat
Status: NEW
Severity: normal
Owner: [EMAIL PROTECTED]
Submitter: [EMAIL PROTECTED]
Most recent kernel where this bug did *NOT* occur: dont know
Distribution: debian
Hardware Environment:
[EMAIL PROTECTED]:~$ sudo s2ram -i
This machine can be identified by:
sys_vendor = "Hewlett-Packard"
sys_product = "HP Compaq nx6325 (EY351ET#ABU)"
sys_version = "F.03"
bios_version = "68TT2 Ver. F.03"
See http://en.opensuse.org/S2ram for details.
If you report a problem, please include the complete output above.
[EMAIL PROTECTED]:~$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 72
model name : AMD Turion(tm) 64 X2 Mobile Technology TL-60
stepping : 2
cpu MHz : 2000.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext
3dnow pni cx16 lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm stc
bogomips : 3992.46
processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 72
model name : AMD Turion(tm) 64 X2 Mobile Technology TL-60
stepping : 2
cpu MHz : 2000.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext
3dnow pni cx16 lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm stc
bogomips : 3992.46
[EMAIL PROTECTED]:~$ lspci
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 10)
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:04.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:05.0 PCI bridge: ATI Technologies Inc Unknown device 5a37
00:06.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:12.0 IDE interface: ATI Technologies Inc ATI 4379 Serial ATA Controller (rev
80)
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev
80)
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev
80)
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller
(rev 80)
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 81)
00:14.1 IDE interface: ATI Technologies Inc Standard Dual Channel PCI IDE
Controller ATI (rev 80)
00:14.2 Audio device: ATI Technologies Inc SB450 HDA Audio (rev 01)
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80)
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
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress
200M]
02:01.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5788 Gigabit
Ethernet (rev 03)
02:04.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
02:04.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE
1394 Host Controller
02:04.2 Mass storage controller: Texas Instruments 5-in-1 Multimedia Card
Reader (SD/MMC/MS/MS PRO/xD)
02:04.3 Generic system peripheral [0805]: Texas Instruments PCIxx12 SDA
Standard Compliant SD Host Controller
30:00.0 Network controller: Broadcom Corporation BCM4310 UART (rev 01)
Software Environment:
32bit debian etch
Problem Description:
after removing Cpu1/core1 (via /sys/..../cpu1/online) and pluging in again the
module powernow-k8 refuses to load,
related problem
if powernow-k8 module loaded and if I plug out and plug in the core1 then
cat /proc/cpuinfo shows bad information about frequency of second core cpu1
though the bogomips is showed properly
link /sys/devices/system/cpu/cpu1/cpufreq to cpu0/cpufreq disapeared
cat /sys/devices/system/cpu/cpu0/cpufreq/affected_cups shows only 0 and before
and at the start it showed 0 1
Steps to reproduce:
1.problem
boot binary debian stock kernel 2.6.18-3-k7 (or compiled kernel 2.6.19.1) in
debian with init=/bin/bash
check by lsmod that there is no powernow-k8 module loaded
root#echo -n 0 > /sys/devices/system/cpu/cpu0/online
root#echo -n 1 > /sys/devices/system/cpu/cpu0/online
root#modprobe powernow-k8
error message about not having devices (I haven't write down the message sorry)
2. problem
boot binary debian stock kernel 2.6.18-3-k7 (or compiled kernel 2.6.19.1) in
debian with init=/bin/bash
modprobe powernow-k8
root#cat /sys/devices/system/cpu/cpu0/cpufreq/affected_cups
0 1
root#ls /sys/devices/system/cpu/cpu1/
rwxr-xr-x 4 root root 0 2007-01-04 01:10 .
drwxr-xr-x 4 root root 0 2007-01-04 01:09 ..
drwxr-xr-x 5 root root 0 2007-01-04 01:09 cache
lrwxrwxrwx 1 root root 0 2007-01-04 01:10
cpufreq -> ../../../../devices/system/cpu/cpu0/cpufreq
-r-------- 1 root root 4096 2007-01-04 01:09 crash_notes
-rw------- 1 root root 4096 2007-01-04 01:09 online
drwxr-xr-x 2 root root 0 2007-01-04 01:09 topology
root#echo -n 0 > /sys/devices/system/cpu/cpu0/online
root#echo -n 1 > /sys/devices/system/cpu/cpu0/online
then
root#cat /sys/devices/system/cpu/cpu0/cpufreq/affected_cups
0
root# ls /sys/devices/system/cpu/cpu1/
rwxr-xr-x 4 root root 0 2007-01-04 01:10 .
drwxr-xr-x 4 root root 0 2007-01-04 01:09 ..
drwxr-xr-x 5 root root 0 2007-01-04 01:09 cache
-r-------- 1 root root 4096 2007-01-04 01:09 crash_notes
-rw------- 1 root root 4096 2007-01-04 01:09 online
drwxr-xr-x 2 root root 0 2007-01-04 01:09 topology
root#modprobe cpufreq_ondemand governor
root#echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
root# cat /proc/cpuinfo
cpu0
cpu MHz : 800
bogomips :1600
cpu1
cpu MHz : 2000
bogomips :1600
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