[Xen-devel] cpufreq issues.

Hi
I am having some cpufreq issues and saw on xen lists that few of the others encountered similar issues as well.

I have some old dual core opteron 275's. I cannot get the CPUfreq to change in userspace. In fact, only boot option cpufreq=dom0-kernel works and the system can only have ondemand governor, which works fine except for the
Timer ISR/1: Time went backwards: delta=-17745355 delta_cpu=32254645 shadow=118262323582 off=721415126 processed=119001483597 cpu_processed=118951483597
messages.

Whenever I try cpufreq=xen option (or as per default nothing), I get kernel oops. Is it the case that these processors cannot have userspace governor in Xen?

My cpufreq=Xen dmesg is as follows

Bootdata ok (command line is root=/dev/mapper/volume_1-host_disk ro console=tty0 max_loop=32 netloop.nloopbacks=8)
Linux version 2.6.18.8-xen (root@vorpalblade1) (gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu4)) #2 SMP Wed Dec 9 17:25:32 EST 2009
BIOS-provided physical RAM map:
Xen: 0000000000000000 - 00000000f4cd8000 (usable)
DMI 2.3 present.
On node 0 totalpages: 989004
DMA zone: 4040 pages, LIFO batch:0
DMA32 zone: 984964 pages, LIFO batch:31
ACPI: RSDP (v002 ACPIAM                                ) @ 0x00000000000f6f50
ACPI: XSDT (v001 A M I OEMXSDT 0x07000519 MSFT 0x00000097) @ 0x00000000bfff0100
ACPI: FADT (v003 A M I OEMFACP 0x07000519 MSFT 0x00000097) @ 0x00000000bfff0290
ACPI: MADT (v001 A M I OEMAPIC 0x07000519 MSFT 0x00000097) @ 0x00000000bfff0390
ACPI: OEMB (v001 A M I OEMBIOS 0x07000519 MSFT 0x00000097) @ 0x00000000bfffe040
ACPI: SRAT (v001 A M I OEMSRAT 0x07000519 MSFT 0x00000097) @ 0x00000000bfff36a0
ACPI: DSDT (v001 PATHV PATHV180 0x00000000 INTL 0x02002026) @ 0x0000000000000000
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled)
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled)
ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 4, version 17, address 0xfec00000, GSI 0-23
ACPI: IOAPIC (id[0x05] address[0xfebfe000] gsi_base[24])
IOAPIC[1]: apic_id 5, version 17, address 0xfebfe000, GSI 24-27
ACPI: IOAPIC (id[0x06] address[0xfebff000] gsi_base[28])
IOAPIC[2]: apic_id 6, version 17, address 0xfebff000, GSI 28-31
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ9 used by override.
Setting APIC routing to xen
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at c4000000 (gap: c0000000:3ec00000)
Built 1 zonelists. Total pages: 989004
Kernel command line: root=/dev/mapper/volume_1-host_disk ro console=tty0 max_loop=32 netloop.nloopbacks=8
Unknown boot option `netloop.nloopbacks=8': ignoring
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 32768 bytes)
Xen reported: 2205.066 MHz processor.
Console: colour VGA+ 80x25
Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
Software IO TLB enabled:
Aperture:     64 megabytes
Kernel range: ffff8800064d2000 - ffff88000a4d2000
Address size: 27 bits
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
Memory: 3836408k/4010848k available (2065k kernel code, 165804k reserved, 889k data, 180k init)
Calibrating delay using timer specific routine.. 4411.26 BogoMIPS (lpj=22056316)
Security Framework v1.0.0 initialized
Capability LSM initialized
Mount-cache hash table entries: 256
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 1024K (64 bytes/line)
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
SMP alternatives: switching to UP code
ACPI: Core revision 20060707
SMP alternatives: switching to SMP code
Initializing CPU#1
Initializing CPU#2
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 1024K (64 bytes/line)
Brought up 4 CPUs
CPU: Physical Processor ID: 1
CPU: Processor Core ID: 0
Initializing CPU#3
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 1024K (64 bytes/line)
CPU: Physical Processor ID: 1
CPU: Processor Core ID: 1
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 1024K (64 bytes/line)
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 1
migration_cost=377
checking if image is initramfs... it is
Freeing initrd memory: 18592k freed
PM: Adding info for No Bus:platform
failed to set up cpufreq notifier
NET: Registered protocol family 16
PM: Adding info for No Bus:xen
PM: Adding info for No Bus:xen-backend
ACPI: bus type pci registered
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
PM: Adding info for acpi:acpi
ACPI: PCI Root Bridge [PCI0] (0000:00)
PCI: Probing PCI hardware (bus 00)
PM: Adding info for No Bus:pci0000:00
Boot video device is 0000:01:06.0
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
PM: Adding info for pci:0000:00:01.0
PM: Adding info for pci:0000:00:01.1
PM: Adding info for pci:0000:00:02.0
PM: Adding info for pci:0000:00:02.1
PM: Adding info for pci:0000:00:06.0
PM: Adding info for pci:0000:00:07.0
PM: Adding info for pci:0000:00:07.1
PM: Adding info for pci:0000:00:07.3
PM: Adding info for pci:0000:00:18.0
PM: Adding info for pci:0000:00:18.1
PM: Adding info for pci:0000:00:18.2
PM: Adding info for pci:0000:00:18.3
PM: Adding info for pci:0000:00:19.0
PM: Adding info for pci:0000:00:19.1
PM: Adding info for pci:0000:00:19.2
PM: Adding info for pci:0000:00:19.3
PM: Adding info for pci:0000:03:01.0
PM: Adding info for pci:0000:03:03.0
PM: Adding info for pci:0000:03:04.0
PM: Adding info for pci:0000:03:05.0
PM: Adding info for pci:0000:02:02.0
PM: Adding info for pci:0000:02:02.1
PM: Adding info for pci:0000:01:00.0
PM: Adding info for pci:0000:01:00.1
PM: Adding info for pci:0000:01:04.0
PM: Adding info for pci:0000:01:06.0
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCI1._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.GOLA._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.GOLB._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 *10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 *5 6 7 9 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 *9 10 11 12 14 15)
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI init
PM: Adding info for No Bus:pnp0
pnp: ACPI device : hid PNP0A03
PM: Adding info for pnp:00:00
pnp: ACPI device : hid PNP0200
PM: Adding info for pnp:00:01
pnp: ACPI device : hid PNP0B00
PM: Adding info for pnp:00:02
pnp: ACPI device : hid PNP0303
PM: Adding info for pnp:00:03
pnp: ACPI device : hid PNP0800
PM: Adding info for pnp:00:04
pnp: ACPI device : hid PNP0C04
PM: Adding info for pnp:00:05
pnp: ACPI device : hid PNP0C02
PM: Adding info for pnp:00:06
pnp: ACPI device : hid PNP0C02
PM: Adding info for pnp:00:07
pnp: ACPI device : hid PNP0C02
PM: Adding info for pnp:00:08
pnp: ACPI device : hid PNP0C01
PM: Adding info for pnp:00:09
pnp: PnP ACPI: found 10 devices
xen_mem: Initialising balloon driver.
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq". If it helps, post a report
pnp: the driver 'system' has been registered
pnp: match found with the PnP device '00:06' and the driver 'system'
pnp: 00:06: ioport range 0xa00-0xa0f has been reserved
pnp: match found with the PnP device '00:07' and the driver 'system'
pnp: match found with the PnP device '00:08' and the driver 'system'
pnp: 00:08: ioport range 0xca2-0xca3 has been reserved
pnp: match found with the PnP device '00:09' and the driver 'system'
PCI: Bridge: 0000:00:01.0
IO window: b000-cfff
MEM window: fe800000-feafffff
PREFETCH window: disabled.
PCI: Bridge: 0000:00:02.0
IO window: a000-afff
MEM window: fe500000-fe7fffff
PREFETCH window: disabled.
PCI: Bridge: 0000:00:06.0
IO window: 7000-9fff
MEM window: fc300000-fe4fffff
PREFETCH window: disabled.
NET: Registered protocol family 2
IP route cache hash table entries: 131072 (order: 8, 1048576 bytes)
TCP established hash table entries: 262144 (order: 10, 4194304 bytes)
TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
TCP: Hash tables configured (established 262144 bind 65536)
TCP reno registered
PM: Adding info for platform:pcspkr
MCE: bind virq for DOM0 logging
MCE_DOM0_LOG: enter dom0 mce vIRQ handler
MCE_DOM0_LOG: No more urgent data
MCE_DOM0_LOG: No more nonurgent data
IA-32 Microcode Update Driver: v1.14a-xen <tigran@xxxxxxxxxxx>
audit: initializing netlink socket (disabled)
audit(1260410553.131:1): initialized
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
PCI: MSI quirk detected. PCI_BUS_FLAGS_NO_MSI set for subordinate bus.
PCI: MSI quirk detected. PCI_BUS_FLAGS_NO_MSI set for subordinate bus.
PM: Adding info for platform:vesafb.0
Non-volatile memory driver v1.2
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
loop: loaded (max 32 devices)
Xen virtual console successfully installed as xvc0
Event-channel device installed.
blktap_device_init: blktap device major 254
blktap_ring_init: blktap ring major: 253
netfront: Initialising virtual ethernet driver.
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
pnp: the driver 'ide' has been registered
pnp: the driver 'i8042 kbd' has been registered
pnp: match found with the PnP device '00:03' and the driver 'i8042 kbd'
pnp: the driver 'i8042 aux' has been registered
PNP: PS/2 Controller [PNP0303:PS2K] at 0x60,0x64 irq 1
PNP: PS/2 controller doesn't have AUX irq; using default 12
PM: Adding info for platform:i8042
serio: i8042 AUX port at 0x60,0x64 irq 12
PM: Adding info for serio:serio0
serio: i8042 KBD port at 0x60,0x64 irq 1
PM: Adding info for serio:serio1
mice: PS/2 mouse device common for all mice
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
NET: Registered protocol family 1
NET: Registered protocol family 17
PCI IO multiplexer device installed.
ACPI: (supports S0 S1 S4 S5)
BIOS EDD facility v0.16 2004-Jun-25, 1 devices found
Freeing unused kernel memory: 180k freed
input: AT Translated Set 2 keyboard as /class/input/input0
fuse init (API version 7.7)
device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised: dm-devel@xxxxxxxxxx
SCSI subsystem initialized
Intel(R) PRO/1000 Network Driver - version 7.1.9-k4-NAPI
Copyright (c) 1999-2006 Intel Corporation.
GSI 16 sharing vector 0x98 and IRQ 16
ACPI: PCI Interrupt 0000:03:01.0[A] -> GSI 25 (level, low) -> IRQ 16
usbcore: registered new driver usbfs
usbcore: registered new driver hub
ohci_hcd: 2005 April 22 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI)
libata version 2.00 loaded.
e1000: 0000:03:01.0: e1000_probe: (PCI:66MHz:32-bit) 00:0e:0c:aa:db:eb
e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
GSI 17 sharing vector 0xA0 and IRQ 17
ACPI: PCI Interrupt 0000:01:00.0[D] -> GSI 19 (level, low) -> IRQ 17
ohci_hcd 0000:01:00.0: OHCI Host Controller
ohci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1
ohci_hcd 0000:01:00.0: irq 17, io mem 0xfcffd000
GSI 18 sharing vector 0xA8 and IRQ 18
ACPI: PCI Interrupt 0000:03:03.0[A] -> GSI 27 (level, low) -> IRQ 18
PM: Adding info for usb:usb1
PM: Adding info for No Bus:usbdev1.1_ep00
usb usb1: configuration #1 chosen from 1 choice
PM: Adding info for usb:1-0:1.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 3 ports detected
PM: Adding info for No Bus:usbdev1.1_ep81
ACPI: PCI Interrupt 0000:01:00.1[D] -> GSI 19 (level, low) -> IRQ 17
ohci_hcd 0000:01:00.1: OHCI Host Controller
ohci_hcd 0000:01:00.1: new USB bus registered, assigned bus number 2
ohci_hcd 0000:01:00.1: irq 17, io mem 0xfcffe000
PM: Adding info for usb:usb2
PM: Adding info for No Bus:usbdev2.1_ep00
usb usb2: configuration #1 chosen from 1 choice
PM: Adding info for usb:2-0:1.0
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 3 ports detected
e1000: 0000:03:03.0: e1000_probe: (PCI:66MHz:32-bit) 00:d0:68:09:18:cc
PM: Adding info for No Bus:usbdev2.1_ep81
e1000: eth1: e1000_probe: Intel(R) PRO/1000 Network Connection
GSI 19 sharing vector 0xB0 and IRQ 19
ACPI: PCI Interrupt 0000:03:04.0[A] -> GSI 24 (level, low) -> IRQ 19
e1000: 0000:03:04.0: e1000_probe: (PCI:66MHz:32-bit) 00:d0:68:09:18:cd
e1000: eth2: e1000_probe: Intel(R) PRO/1000 Network Connection
GSI 20 sharing vector 0xB8 and IRQ 20
sata_sil 0000:03:05.0: version 2.0
ACPI: PCI Interrupt 0000:03:05.0[A] -> GSI 25 (level, low) -> IRQ 16
sata_sil 0000:03:05.0: Applying R_ERR on DMA activate FIS errata fix
ACPI: PCI Interrupt 0000:02:02.0[A] -> <6>ata1: SATA max UDMA/100 cmd 0xFFFFC2000001AC80 ctl 0xFFFFC2000001AC8A bmdma 0xFFFFC2000001AC00 irq 16
ata2: SATA max UDMA/100 cmd 0xFFFFC2000001ACC0 ctl 0xFFFFC2000001ACCA bmdma 0xFFFFC2000001AC08 irq 16
ata3: SATA max UDMA/100 cmd 0xFFFFC2000001AE80 ctl 0xFFFFC2000001AE8A bmdma 0xFFFFC2000001AE00 irq 16
ata4: SATA max UDMA/100 cmd 0xFFFFC2000001AEC0 ctl 0xFFFFC2000001AECA bmdma 0xFFFFC2000001AE08 irq 16
scsi0 : sata_sil
PM: Adding info for No Bus:host0
GSI 30 (level, low) -> IRQ 20
e1000: 0000:02:02.0: e1000_probe: (PCI-X:100MHz:64-bit) 00:04:23:c9:1d:cc
e1000: eth3: e1000_probe: Intel(R) PRO/1000 Network Connection
GSI 21 sharing vector 0xC0 and IRQ 21
ACPI: PCI Interrupt 0000:02:02.1[B] -> GSI 31 (level, low) -> IRQ 21
ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
ata1.00: ATA-7, max UDMA/133, 398297088 sectors: LBA48 NCQ (depth 0/32)
ata1.00: ata1: dev 0 multi count 16
ata1.00: configured for UDMA/100
scsi1 : sata_sil
PM: Adding info for No Bus:host1
e1000: 0000:02:02.1: e1000_probe: (PCI-X:100MHz:64-bit) 00:04:23:c9:1d:cd
e1000: eth4: e1000_probe: Intel(R) PRO/1000 Network Connection
GSI 22 sharing vector 0xC8 and IRQ 22
ACPI: PCI Interrupt 0000:01:04.0[A] -> GSI 16 (level, low) -> IRQ 22
ata2: SATA link down (SStatus 0 SControl 310)
scsi2 : sata_sil
PM: Adding info for No Bus:host2
e1000: 0000:01:04.0: e1000_probe: (PCI:33MHz:32-bit) 00:0e:0c:aa:da:c0
e1000: eth5: e1000_probe: Intel(R) PRO/1000 Network Connection
ata3: SATA link down (SStatus 0 SControl 310)
scsi3 : sata_sil
PM: Adding info for No Bus:host3
ata4: SATA link down (SStatus 0 SControl 310)
PM: Adding info for No Bus:target0:0:0
Vendor: ATA       Model: Maxtor 6V200E0    Rev: VA11
Type:   Direct-Access                      ANSI SCSI revision: 05
PM: Adding info for scsi:0:0:0:0
AMD8111: IDE controller at PCI slot 0000:00:07.1
AMD8111: chipset revision 3
AMD8111: not 100% native mode: will probe irqs later
AMD8111: 0000:00:07.1 (rev 03) UDMA133 controller
    ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:pio, hdd:pio
Probing IDE interface ide0...
SCSI device sda: 398297088 512-byte hdwr sectors (203928 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 398297088 512-byte hdwr sectors (203928 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
sda: sda1 sda2
sd 0:0:0:0: Attached scsi disk sda
sd 0:0:0:0: Attached scsi generic sg0 type 0
Probing IDE interface ide1...
SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled
SGI XFS Quota Management subsystem
Filesystem "dm-1": Disabling barriers, not supported by the underlying device
XFS mounting filesystem dm-1
Ending clean XFS mount for filesystem: dm-1
udev: renamed network interface eth2 to eth1
udev: renamed network interface eth3 to eth2
udev: renamed network interface eth4 to eth3
udev: renamed network interface eth1 to eth0
udev: renamed network interface eth0_rename to eth4
input: PC Speaker as /class/input/input1
PM: Adding info for No Bus:i2c-0
AMD768 RNG detected
e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex
e1000: eth1: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex
pnp: the driver 'parport_pc' has been registered
lp: driver loaded but no devices found
ieee1394: Initialized config rom entry `ip1394'
ieee1394: sbp2: Driver forced to serialize I/O (serialize_io=1)
ieee1394: sbp2: Try serialize_io=0 for better performance
Filesystem "dm-1": Disabling barriers, not supported by the underlying device
kjournald starting. Commit interval 5 seconds
EXT3 FS on sda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
Adding 1023992k swap on /dev/mapper/volume_1-host_swap. Priority:-1 extents:1 across:1023992k
ip_tables: (C) 2000-2006 Netfilter Core Team
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
IPv6 over IPv4 tunneling driver
powernow-k8: Found 4 Dual Core AMD Opteron(tm) Processor 275 processors (version 2.20.00)
powernow-k8:    0 : fid 0xe (2200 MHz), vid 0x8
powernow-k8:    1 : fid 0xc (2000 MHz), vid 0xa
powernow-k8:    2 : fid 0xa (1800 MHz), vid 0xc
powernow-k8:    3 : fid 0x2 (1000 MHz), vid 0x12
powernow-k8: fid trans failed, fid 0xa, curr 0x0
BUG: warning at /mnt/datax/linux-2.6.18-xen.hg/arch/x86_64/kernel/../../i386/kernel/time-xen.c:1153/time_cpufreq_notifier()

Call Trace:
[<ffffffff8020cee3>] time_cpufreq_notifier+0x7a/0x84
[<ffffffff80229b84>] set_cpus_allowed+0xa1/0xae
[<ffffffff804007c3>] __down_read+0x12/0xec
[<ffffffff8023ca63>] notifier_call_chain+0x20/0x32
[<ffffffff8023cf46>] blocking_notifier_call_chain+0x22/0x36
[<ffffffff80394842>] cpufreq_notify_transition+0xec/0x104
[<ffffffff8831be0e>] :powernow_k8:powernowk8_target+0x78c/0x865
[<ffffffff80395022>] cpufreq_governor_performance+0x3e/0x44
[<ffffffff80393771>] __cpufreq_governor+0x6a/0xf6
[<ffffffff80393977>] __cpufreq_set_policy+0x17a/0x1f4
[<ffffffff80393a29>] cpufreq_set_policy+0x38/0x86
[<ffffffff80394583>] cpufreq_add_dev+0x3ae/0x4f6
[<ffffffff803949c7>] handle_update+0x0/0x28
[<ffffffff80346d08>] sysdev_driver_register+0x6e/0xc1
[<ffffffff8039362f>] cpufreq_register_driver+0xb9/0x191
[<ffffffff8024c22d>] sys_init_module+0x1720/0x184f
[<ffffffff802095e4>] system_call+0x68/0x6d
[<ffffffff8020957c>] system_call+0x0/0x6d

Unable to handle kernel paging request at ffff880801f80478 RIP:
[<ffffffff80394c6e>] cpufreq_stats_update+0x38/0x50
PGD 1fad067 PUD 0
Oops: 0002 [1] SMP
CPU 0
Modules linked in: powernow_k8 cpufreq_userspace cpufreq_powersave cpufreq_ondemand cpufreq_conservative ipv6 iptable_filter ip_tables x_tables nfs lockd nfs_acl sunrpc ext3 jbd sbp2 ieee1394 parport_pc lp parport amd_rng serio_raw i2c_amd756 pcspkr i2c_core xfs sg sd_mod amd74xx sata_sil libata ohci_hcd usbcore e1000 scsi_mod dm_mirror dm_snapshot dm_mod thermal processor fan fuse
Pid: 3519, comm: modprobe Not tainted 2.6.18.8-xen #2
RIP: e030:[<ffffffff80394c6e>] [<ffffffff80394c6e>] cpufreq_stats_update+0x38/0x50
RSP: e02b:ffff8800f3429ae8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff880001f80480
RDX: 00000000ffffffff RSI: ffff8800f1f4d2c0 RDI: ffffffff805ba560
RBP: 00000000ffffb43b R08: 0000000000000004 R09: 0000000000000000
R10: 000000000000006d R11: 0000000000000000 R12: ffff8800f3429bb8
R13: 00000000ffffffff R14: 0000000000000008 R15: 0000000000000000
FS: 00002b896c7636e0(0000) GS:ffffffff804e3000(0000) knlGS:0000000000000000
CS: e033 DS: 0000 ES: 0000
Process modprobe (pid: 3519, threadinfo ffff8800f3428000, task ffff8800f364e040)
Stack: 0000000000000001 00000000ffffffff ffff8800f1f4d2c0 ffffffff80394ccd
0000000000008124 ffffffff883182a0 ffff8800f3429bb8 0000000000000001
0000000000000001 ffffffff8023ca63 ffffffff804a22d0 ffff8800f3429bb8
Call Trace:
[<ffffffff80394ccd>] cpufreq_stat_notifier_trans+0x47/0x7b
[<ffffffff8023ca63>] notifier_call_chain+0x20/0x32
[<ffffffff8023cf46>] blocking_notifier_call_chain+0x22/0x36
[<ffffffff80394842>] cpufreq_notify_transition+0xec/0x104
[<ffffffff8831be0e>] :powernow_k8:powernowk8_target+0x78c/0x865
[<ffffffff80395022>] cpufreq_governor_performance+0x3e/0x44
[<ffffffff80393771>] __cpufreq_governor+0x6a/0xf6
[<ffffffff80393977>] __cpufreq_set_policy+0x17a/0x1f4
[<ffffffff80393a29>] cpufreq_set_policy+0x38/0x86
[<ffffffff80394583>] cpufreq_add_dev+0x3ae/0x4f6
[<ffffffff803949c7>] handle_update+0x0/0x28
[<ffffffff80346d08>] sysdev_driver_register+0x6e/0xc1
[<ffffffff8039362f>] cpufreq_register_driver+0xb9/0x191
[<ffffffff8024c22d>] sys_init_module+0x1720/0x184f
[<ffffffff802095e4>] system_call+0x68/0x6d
[<ffffffff8020957c>] system_call+0x0/0x6d

Code: 48 01 04 d1 48 89 6e 08 c7 05 e0 58 22 00 01 00 00 00 5a 5b
RIP [<ffffffff80394c6e>] cpufreq_stats_update+0x38/0x50
RSP <ffff8800f3429ae8>
CR2: ffff880801f80478
<7>eth1: no IPv6 routers present
eth0: no IPv6 routers present

------------------------------------------------------------------------------------------------------------------------------------
technically, all i want is to be able to set the frequency myself.

Best Regards,
Muhammad Atif

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[Xen-devel] cpufreq issues.