[Xen-devel] Latest unstable detects cpu speed incorrectly

[Valtteri Kiviniemi <valtteri.kiviniemi@xxxxxxxxxxxx>]

Hi,

We are testing the latest xen-unstable and found an interesting bug. 
dom0 detects cpu speed correctly but when booting domU it detects it 
incorrectly:
"Detected 1000.000 MHz processor."

domU config:

kernel = "/boot/bzImage-domU"
builder = "linux"
memory = "512"
name = "test"
vcpus = "8"
cpus = [ "0", "1", "2", "3", "4", "5", "6", "7" ]
vif = [ "mac=00:50:56:14:89:13, bridge=eth0" ]
disk = [ "phy:/dev/virtuals/test,xvda1,w",
         "phy:/dev/backups/test,xvda2,w" ]
root = "/dev/xvda1 ro"
extra = "console=hvc0"
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"

cpu info from domU:

test:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 23
model name      : Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz
stepping        : 6
cpu MHz         : 1000.000
cache size      : 6144 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu de tsc msr pae cx8 sep cmov clflush mmx fxsr sse 
sse2 ss ht syscall nx lm constant_tsc rep_good pni ssse3 cx16 sse4_1 
hypervisor lahf_lm
bogomips        : 2000.00
clflush size    : 64
cache_alignment : 64
address sizes   : 38 bits physical, 48 bits virtual
power management:

domU's boot output:

Linux version 2.6.31.4-domU-00396-g9cf89da (root@xen) (gcc version 4.3.4 
(Debian 4.3.4-5) ) #15 SMP Mon Oct 26 19:25:50 EET 2009
Command line: root=/dev/xvda1 ro console=hvc0
KERNEL supported cpus:
  Intel GenuineIntel
  AMD AuthenticAMD
  Centaur CentaurHauls
released 0 pages of unused memory
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 00000000000a0000 (usable)
 Xen: 00000000000a0000 - 0000000000100000 (reserved)
 Xen: 0000000000100000 - 0000000020000000 (usable)
DMI not present or invalid.
last_pfn = 0x20000 max_arch_pfn = 0x400000000
init_memory_mapping: 0000000000000000-0000000020000000
(6 early reservations) ==> bootmem [0000000000 - 0020000000]
  #0 [0000000000 - 0000001000]   BIOS data page ==> [0000000000 - 
0000001000]
  #1 [00015fe000 - 000160d000]   XEN PAGETABLES ==> [00015fe000 - 
000160d000]
  #2 [0000006000 - 0000008000]       TRAMPOLINE ==> [0000006000 - 
0000008000]
  #3 [0001000000 - 00014da804]    TEXT DATA BSS ==> [0001000000 - 
00014da804]
  #4 [00014fb000 - 00015fe000]   XEN START INFO ==> [00014fb000 - 
00015fe000]
  #5 [0000100000 - 00001f0000]          PGTABLE ==> [0000100000 - 
00001f0000]
Zone PFN ranges:
  DMA      0x00000000 -> 0x00001000
  DMA32    0x00001000 -> 0x00100000
  Normal   0x00100000 -> 0x00100000
Movable zone start PFN for each node
early_node_map[2] active PFN ranges
    0: 0x00000000 -> 0x000000a0
    0: 0x00000100 -> 0x00020000
SMP: Allowing 8 CPUs, 0 hotplug CPUs
No local APIC present
APIC: disable apic facility
Allocating PCI resources starting at 20000000 (gap: 20000000:e0000000)
NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:8 nr_node_ids:1
PERCPU: Allocated 19 4k pages, static data 74976 bytes
Xen: using vcpu_info placement
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 128941
Kernel command line: root=/dev/xvda1 ro console=hvc0
PID hash table entries: 2048 (order: 11, 16384 bytes)
Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
Initializing CPU#0
Memory: 507316k/524288k available (2788k kernel code, 384k absent, 
15860k reserved, 1353k data, 328k init)
SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=8, Nodes=1
NR_IRQS:512
Detected 1000.000 MHz processor.
Console: colour dummy device 80x25
console [tty0] enabled
console [hvc0] enabled
installing Xen timer for CPU 0
Calibrating delay loop (skipped), value calculated using timer 
frequency.. 2000.00 BogoMIPS (lpj=10000000)
Mount-cache hash table entries: 256
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
SMP alternatives: switching to UP code
installing Xen timer for CPU 1
SMP alternatives: switching to SMP code
Initializing CPU#1
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
installing Xen timer for CPU 2
Initializing CPU#2
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
installing Xen timer for CPU 3
Initializing CPU#3
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
installing Xen timer for CPU 4
Initializing CPU#4
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
installing Xen timer for CPU 5
Initializing CPU#5
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
installing Xen timer for CPU 6
Initializing CPU#6
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
installing Xen timer for CPU 7
Initializing CPU#7
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
Brought up 8 CPUs
Booting paravirtualized kernel on Xen
Xen version: 3.5-unstable (preserve-AD)
Using V2 grant tables.
Grant table initialized
NET: Registered protocol family 16
xenbus_probe wake_waiting
xenbus_probe_init ok
bio: create slab <bio-0> at 0
xenbus_probe_frontend_init bus registered ok
xenbus_probe_devices device
xenbus_probe_devices 1/3 vbd
xenbus_probe_device_type type vbd
xenbus_probe_device_type 1/2 51713
xenbus_probe_device_type 2/2 51714
xenbus_probe_device_type done
xenbus_probe_devices 2/3 vif
xenbus_probe_device_type type vif
xenbus_probe_device_type 1/1 0
xenbus_probe_device_type done
xenbus_probe_devices 3/3 console
xenbus_probe_device_type type console
xenbus_probe_device_type 1/1 0
xenbus_probe_device_type done
xenbus_probe_devices done
frontend_probe_and_watch devices probed ok
frontend_probe_and_watch watch add ok ok
frontend_probe_and_watch all done
xen_balloon: Initialising balloon driver.
SCSI subsystem initialized
NET: Registered protocol family 2
IP route cache hash table entries: 16384 (order: 5, 131072 bytes)
TCP established hash table entries: 65536 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
TCP: Hash tables configured (established 65536 bind 65536)
TCP reno registered
NET: Registered protocol family 1
platform rtc_cmos: registered platform RTC device (no PNP device found)
Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx).
fuse init (API version 7.12)
SGI XFS with ACLs, security attributes, realtime, large block/inode 
numbers, no debug enabled
SGI XFS Quota Management subsystem
msgmni has been set to 992
alg: No test for stdrng (krng)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
io scheduler noop registered
io scheduler cfq registered (default)
Event-channel device installed.
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
blkfront: xvda1: barriers enabled
Initialising Xen virtual ethernet driver.
blkfront: xvda2: barriers enabled
i8042.c: No controller found.
mice: PS/2 mouse device common for all mice
Netfilter messages via NETLINK v0.30.
nf_conntrack version 0.5.0 (4096 buckets, 16384 max)
CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use
nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module option or
sysctl net.netfilter.nf_conntrack_acct=1 to enable it.
ctnetlink v0.93: registering with nfnetlink.
NF_TPROXY: Transparent proxy support initialized, version 4.1.0
NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.
xt_time: kernel timezone is -0000
ip_tables: (C) 2000-2006 Netfilter Core Team
ClusterIP Version 0.8 loaded successfully
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
NET: Registered protocol family 15
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
802.1Q VLAN Support v1.8 Ben Greear <greearb@xxxxxxxxxxxxxxx>
All bugs added by David S. Miller <davem@xxxxxxxxxx>
registered taskstats version 1
XENBUS: Device with no driver: device/console/0
XFS mounting filesystem xvda1
VFS: Mounted root (xfs filesystem) readonly on device 202:1.
Freeing unused kernel memory: 328k freed
INIT: version 2.86 booting
Starting the hotplug events dispatcher: udevd.
Synthesizing the initial hotplug events...done.
Waiting for /dev to be fully populated...done.
Activating swap...done.
Checking root file system...fsck from util-linux-ng 2.16.1
/sbin/fsck.xfs: XFS file system.
done.
Cleaning up ifupdown....
Checking file systems...fsck from util-linux-ng 2.16.1
/sbin/fsck.xfs: XFS file system.
done.
Setting up networking....
Mounting local filesystems...XFS mounting filesystem xvda2
done.
Activating swapfile swap...done.
Cleaning up temporary files....
Configuring network interfaces...if-up.d/mountnfs[eth0]: waiting for 
interface eth0:1 before doing NFS mounts ... (warning).
done.
Setting kernel variables (/etc/sysctl.conf)...done.
Starting portmap daemon....
Starting NFS common utilities: statd.
Cleaning up temporary files....
INIT: Entering runlevel: 2
Starting Zabbix agent: zabbix_agentd
Starting NFS common utilities: statd.
Starting enhanced syslogd: rsyslogd.
Starting web server: apache2.
Starting periodic command scheduler: cron.
Starting MTA: exim4.
Starting ident daemon: oidentd.
Starting OpenBSD Secure Shell server: sshd.

Debian GNU/Linux squeeze/sid test hvc0

test login:

- Valtteri Kiviniemi

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