[2.6.0-test3] Hyperthreading gone

[2.6.0-test3] Hyperthreading gone

[Florian Weimer]

ACPI with CPU enumeration is enabled, but the sibling CPUs aren't
activated.

This is all what I have of the boot message (standard buffer size is
too small, apparently):

CPU:     After all inits, caps: 3febfbff 00000000 00000000 00000080
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#3.
CPU#3: Intel P4/Xeon Extended MCE MSRs (12) available
CPU#3: Thermal monitoring enabled
CPU3: Intel(R) Xeon(TM) CPU 1.40GHz stepping 01
Total of 4 processors activated (11034.62 BogoMIPS).
WARNING: No sibling found for CPU 0.
WARNING: No sibling found for CPU 1.
WARNING: No sibling found for CPU 2.
WARNING: No sibling found for CPU 3.

Recent 2.4.x kernels (starting with 2.4.20 IIRC) support
Hyperthreading on this machine (Siemens Primergy H450).

Re: [2.6.0-test3] Hyperthreading gone

[Gabor MICSKO]

2003-08-09, szo keltezéssel Florian Weimer ezt írta:
> ACPI with CPU enumeration is enabled, but the sibling CPUs aren't
> activated.
> Total of 4 processors activated (11034.62 BogoMIPS).

> WARNING: No sibling found for CPU 0.

Yep. Same problem here. 


-test3 (root@sunshine) (gcc version 3.3.1 20030626 (Debian prerelease))
#4 SMP 2003. aug. 9., szombat, 22.32.15 CEST
Video mode to be used for restore is 317
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000001ff40000 (usable)
 BIOS-e820: 000000001ff40000 - 000000001ff50000 (ACPI data)
 BIOS-e820: 000000001ff50000 - 0000000020000000 (ACPI NVS)
511MB LOWMEM available.
found SMP MP-table at 000ff780
hm, page 000ff000 reserved twice.
hm, page 00100000 reserved twice.
hm, page 000fd000 reserved twice.
hm, page 000fe000 reserved twice.
On node 0 totalpages: 130880
  DMA zone: 4096 pages, LIFO batch:1
  Normal zone: 126784 pages, LIFO batch:16
  HighMem zone: 0 pages, LIFO batch:1
Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
OEM ID:  Product ID: BrkdlPE-ICH4 APIC at: 0xFEE00000
Processor #0 15:2 APIC version 20
I/O APIC #2 Version 32 at 0xFEC00000.
Enabling APIC mode:  Flat.  Using 1 I/O APICs
Processors: 1
Building zonelist for node : 0
Kernel command line: auto BOOT_IMAGE=3 ro root=304
BOOT_FILE=/boot/bzImage-3 hdd=ide-scsi 
ide_setup: hdd=ide-scsi
Initializing CPU#0
PID hash table entries: 2048 (order 11: 16384 bytes)
Detected 3066.970 MHz processor.
Console: colour dummy device 80x25
Calibrating delay loop... 6062.08 BogoMIPS
Memory: 514336k/523520k available (1969k kernel code, 8432k reserved,
629k data, 336k init, 0k highmem)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
-> /dev
-> /dev/console
-> /root
CPU:     After generic identify, caps: bfebfbff 00000000 00000000
00000000
CPU:     After vendor identify, caps: bfebfbff 00000000 00000000
00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
CPU:     After all inits, caps: bfebfbff 00000000 00000000 00000080
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU#0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU#0: Thermal monitoring enabled
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
CPU0: Intel(R) Pentium(R) 4 CPU 3.06GHz stepping 07
per-CPU timeslice cutoff: 1463.27 usecs.
task migration cache decay timeout: 2 msecs.
enabled ExtINT on CPU#0
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Error: only one processor found.
WARNING: No sibling found for CPU 0.
ENABLING IO-APIC IRQs
Setting 2 in the phys_id_present_map
...changing IO-APIC physical APIC ID to 2 ... ok.
init IO_APIC IRQs
 IO-APIC (apicid-pin) 2-0, 2-22 not connected.
..TIMER: vector=0x31 pin1=2 pin2=0
number of MP IRQ sources: 28.
number of IO-APIC #2 registers: 24.
testing the IO APIC.......................
IO APIC #2......
.... register #00: 02000000
.......    : physical APIC id: 02
.......    : Delivery Type: 0
.......    : LTS          : 0
.... register #01: 00178020
.......     : max redirection entries: 0017
.......     : PRQ implemented: 1
.......     : IO APIC version: 0020
.... register #02: 00000000
.......     : arbitration: 00
.... register #03: 00000001
.......     : Boot DT    : 1
.... IRQ redirection table:
 NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
 00 000 00  1    0    0   0   0    0    0    00
 01 001 01  0    0    0   0   0    1    1    39
 02 001 01  0    0    0   0   0    1    1    31
 03 001 01  0    0    0   0   0    1    1    41
 04 001 01  0    0    0   0   0    1    1    49
 05 001 01  0    0    0   0   0    1    1    51
 06 001 01  0    0    0   0   0    1    1    59
 07 001 01  0    0    0   0   0    1    1    61
 08 001 01  0    0    0   0   0    1    1    69
 09 001 01  1    1    0   0   0    1    1    71
 0a 001 01  0    0    0   0   0    1    1    79
 0b 001 01  0    0    0   0   0    1    1    81
 0c 001 01  0    0    0   0   0    1    1    89
 0d 001 01  0    0    0   0   0    1    1    91
 0e 001 01  0    0    0   0   0    1    1    99
 0f 001 01  0    0    0   0   0    1    1    A1
 10 001 01  1    1    0   1   0    1    1    A9
 11 001 01  1    1    0   1   0    1    1    B1
 12 001 01  1    1    0   1   0    1    1    B9
 13 001 01  1    1    0   1   0    1    1    C1
 14 001 01  1    1    0   1   0    1    1    C9
 15 001 01  1    1    0   1   0    1    1    D1
 16 000 00  1    0    0   0   0    0    0    00
 17 001 01  1    1    0   1   0    1    1    D9
IRQ to pin mappings:
IRQ0 -> 0:2
IRQ1 -> 0:1
IRQ3 -> 0:3
IRQ4 -> 0:4
IRQ5 -> 0:5
IRQ6 -> 0:6
IRQ7 -> 0:7
IRQ8 -> 0:8
IRQ9 -> 0:9
IRQ10 -> 0:10
IRQ11 -> 0:11
IRQ12 -> 0:12
IRQ13 -> 0:13
IRQ14 -> 0:14
IRQ15 -> 0:15
IRQ16 -> 0:16
IRQ17 -> 0:17
IRQ18 -> 0:18
IRQ19 -> 0:19
IRQ20 -> 0:20
IRQ21 -> 0:21
IRQ23 -> 0:23
.................................... done.
Using local APIC timer interrupts.
calibrating APIC timer ...
..... CPU clock speed is 3066.0244 MHz.
..... host bus clock speed is 133.0314 MHz.
Starting migration thread for cpu 0
CPUS done 2
Initializing RT netlink socket
PCI: PCI BIOS revision 2.10 entry at 0xf0031, last bus=2
PCI: Using configuration type 1
mtrr: v2.0 (20020519)
BIO: pool of 256 setup, 14Kb (56 bytes/bio)
biovec pool[0]:   1 bvecs: 256 entries (12 bytes)
biovec pool[1]:   4 bvecs: 256 entries (48 bytes)
biovec pool[2]:  16 bvecs: 256 entries (192 bytes)
biovec pool[3]:  64 bvecs: 256 entries (768 bytes)
biovec pool[4]: 128 bvecs: 256 entries (1536 bytes)
biovec pool[5]: 256 bvecs: 256 entries (3072 bytes)
Linux Plug and Play Support v0.97 (c) Adam Belay
PnPBIOS: Scanning system for PnP BIOS support...
PnPBIOS: Found PnP BIOS installation structure at 0xc00f47a0
PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x4dda, dseg 0xf0000
PnPBIOS: Unknown tag '0x82', length '12'.
PnPBIOS: 16 nodes reported by PnP BIOS; 16 recorded by driver
drivers/usb/core/usb.c: registered new driver usbfs
drivers/usb/core/usb.c: registered new driver hub
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1
Transparent bridge - 0000:00:1e.0
PCI: Using IRQ router PIIX [8086/24c0] at 0000:00:1f.0
PCI->APIC IRQ transform: (B0,I29,P0) -> 16
PCI->APIC IRQ transform: (B0,I29,P1) -> 19
PCI->APIC IRQ transform: (B0,I29,P2) -> 18
PCI->APIC IRQ transform: (B0,I29,P3) -> 23
PCI->APIC IRQ transform: (B0,I31,P0) -> 18
PCI->APIC IRQ transform: (B0,I31,P1) -> 17
PCI->APIC IRQ transform: (B0,I31,P1) -> 17
PCI->APIC IRQ transform: (B1,I0,P0) -> 16
PCI->APIC IRQ transform: (B2,I2,P0) -> 18
PCI->APIC IRQ transform: (B2,I3,P0) -> 19
PCI->APIC IRQ transform: (B2,I3,P0) -> 19
PCI->APIC IRQ transform: (B2,I4,P0) -> 17
PCI->APIC IRQ transform: (B2,I6,P0) -> 21
PCI->APIC IRQ transform: (B2,I8,P0) -> 20
PCI: Cannot allocate resource region 0 of device 0000:02:04.0
vesafb: framebuffer at 0xe8000000, mapped to 0xe0800000, size 16384k
vesafb: mode is 1024x768x16, linelength=2048, pages=0
vesafb: protected mode interface info at c000:c220
vesafb: scrolling: redraw
vesafb: directcolor: size=0:5:6:5, shift=0:11:5:0
fb0: VESA VGA frame buffer device
Console: switching to colour frame buffer device 128x48
pty: 256 Unix98 ptys configured
Machine check exception polling timer started.
cpufreq: P4/Xeon(TM) CPU On-Demand Clock Modulation available
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
NTFS driver 2.1.4 [Flags: R/O].
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Real Time Clock Driver v1.11
hw_random hardware driver 1.0.0 loaded
Linux agpgart interface v0.100 (c) Dave Jones
agpgart: Detected an Intel 845G Chipset.
agpgart: Maximum main memory to use for agp memory: 439M
agpgart: AGP aperture is 64M @ 0xf8000000
Serial: 8250/16550 driver $Revision: 1.90 $ IRQ sharing disabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
Intel(R) PRO/100 Network Driver - version 2.3.18-k1
Copyright (c) 2003 Intel Corporation

e100: selftest OK.
e100: eth0: Intel(R) PRO/100 Network Connection

e100: selftest OK.
e100: eth1: Intel(R) PRO/100 Network Connection
  Hardware receive checksums enabled

Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
ICH4: IDE controller at PCI slot 0000:00:1f.1
PCI: Enabling device 0000:00:1f.1 (0005 -> 0007)
ICH4: chipset revision 2
ICH4: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:DMA
hda: IC35L080AVVA07-0, ATA DISK drive
hdb: WDC WD800BB-22CAA0, ATA DISK drive
Using anticipatory scheduling elevator
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hdc: DVD-ROM DDU1621, ATAPI CD/DVD-ROM drive
hdd: SONY CD-RW CRX175A1, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
hda: max request size: 128KiB
hda: 160836480 sectors (82348 MB) w/1863KiB Cache, CHS=65535/16/63,
UDMA(100)
 hda: hda1 hda2 hda3 hda4
hdb: max request size: 128KiB
hdb: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=65535/16/63,
UDMA(100)
 hdb: hdb1
end_request: I/O error, dev hdc, sector 0
hdc: ATAPI 40X DVD-ROM drive, 512kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.12
Console: switching to colour frame buffer device 128x48
mice: PS/2 mouse device common for all mice
serio: i8042 AUX port at 0x60,0x64 irq 12
input: AT Set 2 keyboard on isa0060/serio0
serio: i8042 KBD port at 0x60,0x64 irq 1
NET4: Linux TCP/IP 1.0 for NET4.0
IP: routing cache hash table of 4096 buckets, 32Kbytes
TCP: Hash tables configured (established 32768 bind 32768)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
found reiserfs format "3.6" with standard journal
Reiserfs journal params: device hda4, size 8192, journal first block 18,
max trans len 1024, max batch 900, max commit age 30, max trans age 30
reiserfs: checking transaction log (hda4) for (hda4)
Using r5 hash to sort names
VFS: Mounted root (reiserfs filesystem) readonly.
Freeing unused kernel memory: 336k freed
Adding 128512k swap on /dev/hda2.  Priority:-1 extents:1
Intel 810 + AC97 Audio, version 0.24, 10:49:44 Aug  9 2003
PCI: Setting latency timer of device 0000:00:1f.5 to 64
i810: Intel ICH4 found at IO 0xe080 and 0xe400, MEM 0xfebff800 and
0xfebff400, IRQ 17
i810: Intel ICH4 mmio at 0xe18e1800 and 0xe18e3400
i810_audio: Primary codec has ID 2
i810_audio: Audio Controller supports 6 channels.
i810_audio: Defaulting to base 2 channel mode.
i810_audio: Resetting connection 0
i810_audio: Connection 0 with codec id 2
ac97_codec: AC97 Audio codec, id: ADS112 (Unknown)
i810_audio: AC'97 codec 2 supports AMAP, total channels = 6
i810_audio: setting clocking to 48566
nvidia: module license 'NVIDIA' taints kernel.
0: nvidia: loading NVIDIA Linux x86 nvidia.o Kernel Module  1.0-4496 
Wed Jul 16 19:03:09 PDT 2003
i2c-i801 version 2.7.0 (20021208)
ip_tables: (C) 2000-2002 Netfilter core team
ip_conntrack version 2.1 (4090 buckets, 32720 max) - 304 bytes per
conntrack
drivers/usb/core/usb.c: registered new driver hid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
SCSI subsystem initialized
Initializing USB Mass Storage driver...
drivers/usb/core/usb.c: registered new driver usb-storage
USB Mass Storage support registered.
CSLIP: code copyright 1989 Regents of the University of California
PPP generic driver version 2.4.2
PPP BSD Compression module registered
PPP Deflate Compression module registered
Linux video capture interface: v1.00
bttv: driver version 0.9.11 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Host bridge is 0000:00:00.0
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 17) at 0000:02:03.0, irq: 19, latency: 32, mmio:
0xf42fd000
bttv0: detected: Pinnacle PCTV [bswap] [card=39], PCI subsystem ID is
bd11:1200
bttv0: using: BT878(Pinnacle PCTV Studio/Ra) [card=39,autodetected]
bttv0: i2c: checking for MSP34xx @ 0x80... not found
bttv0: miro: id=16 tuner=1 radio=fmtuner stereo=no
bttv0: using tuner=1
bttv0: i2c: checking for MSP34xx @ 0x80... not found
bttv0: i2c: checking for TDA9875 @ 0xb0... not found
bttv0: i2c: checking for TDA7432 @ 0x8a... not found
tvaudio: TV audio decoder + audio/video mux driver
tvaudio: known chips:
tda9840,tda9873h,tda9874h/a,tda9850,tda9855,tea6300,tea6420,tda8425,pic16c54 (PV951),ta8874z
tuner: chip found @ 0xc2
tuner: type set to 1 (Philips PAL_I (FI1246 and compatibles))
registering 1-0061
videodev: "BT878(Pinnacle PCTV Studio/Ra)" has no release callback.
Please fix your driver for proper sysfs support, see
http://lwn.net/Articles/36850/
bttv0: registered device video0
videodev: "bt848/878 vbi" has no release callback. Please fix your
driver for proper sysfs support, see http://lwn.net/Articles/36850/
bttv0: registered device vbi0
videodev: "bt848/878 radio" has no release callback. Please fix your
driver for proper sysfs support, see http://lwn.net/Articles/36850/
bttv0: registered device radio0
bttv0: PLL: 28636363 => 35468950 .. ok
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
  Vendor: SONY      Model: CD-RW  CRX175A1   Rev: 5YS3
  Type:   CD-ROM                             ANSI SCSI revision: 02
sr0: scsi-1 drive
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
found reiserfs format "3.6" with standard journal
Reiserfs journal params: device hdb1, size 8192, journal first block 18,
max trans len 1024, max batch 900, max commit age 30, max trans age 30
reiserfs: checking transaction log (hdb1) for (hdb1)
Using r5 hash to sort names
ehci_hcd 0000:00:1d.7: EHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.7 to 64
ehci_hcd 0000:00:1d.7: irq 23, pci mem e19b4c00
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
ehci_hcd 0000:00:1d.7: enabled 64bit PCI DMA
PCI: cache line size of 128 is not supported by device 0000:00:1d.7
ehci_hcd 0000:00:1d.7: USB 2.0 enabled, EHCI 1.00, driver 2003-Jun-13
hub 1-0:0: USB hub found
hub 1-0:0: 6 ports detected
drivers/usb/host/uhci-hcd.c: USB Universal Host Controller Interface
driver v2.1
uhci-hcd 0000:00:1d.0: UHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.0 to 64
uhci-hcd 0000:00:1d.0: irq 16, io base 0000e800
uhci-hcd 0000:00:1d.0: new USB bus registered, assigned bus number 2
hub 2-0:0: USB hub found
hub 2-0:0: 2 ports detected
uhci-hcd 0000:00:1d.1: UHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.1 to 64
uhci-hcd 0000:00:1d.1: irq 19, io base 0000e880
uhci-hcd 0000:00:1d.1: new USB bus registered, assigned bus number 3
hub 3-0:0: USB hub found
hub 3-0:0: 2 ports detected
uhci-hcd 0000:00:1d.2: UHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.2 to 64
uhci-hcd 0000:00:1d.2: irq 18, io base 0000ec00
uhci-hcd 0000:00:1d.2: new USB bus registered, assigned bus number 4
hub 4-0:0: USB hub found
hub 4-0:0: 2 ports detected
hub 1-0:0: debounce: port 3: delay 100ms stable 4 status 0x501
hub 3-0:0: debounce: port 1: delay 100ms stable 4 status 0x301
hub 3-0:0: new USB device on port 1, assigned address 2
input: USB HID v1.00 Mouse [Microsoft Microsoft IntelliMouseŽ Explorer]
on usb-0000:00:1d.1-1
e100: eth0 NIC Link is Up 100 Mbps Full duplex

-- 
Windows not found
(C)heers, (P)arty or (D)ance?
-----------------------------------
Micskó Gábor
Compaq Accredited Platform Specialist, System Engineer (APS, ASE)
Szintézis Computer Rendszerház Rt.      
H-9021 Győr, Tihanyi Árpád út 2.
Tel: +36-96-502-216
Fax: +36-96-318-658
E-mail: gmicsko@szintezis.hu
Web: http://www.hup.hu/

Re: [2.6.0-test3] Hyperthreading gone

[Greg Norris]

Did you select CPU Enumeration Only, or "normal" ACPI?  If the former,
did you specify the "acpismp=force" parameter at bootup?

On Sat, Aug 09, 2003 at 07:08:43PM +0200, Florian Weimer wrote:
> ACPI with CPU enumeration is enabled, but the sibling CPUs aren't
> activated.
> 
> This is all what I have of the boot message (standard buffer size is
> too small, apparently):
> 
> CPU:     After all inits, caps: 3febfbff 00000000 00000000 00000080
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#3.
> CPU#3: Intel P4/Xeon Extended MCE MSRs (12) available
> CPU#3: Thermal monitoring enabled
> CPU3: Intel(R) Xeon(TM) CPU 1.40GHz stepping 01
> Total of 4 processors activated (11034.62 BogoMIPS).
> WARNING: No sibling found for CPU 0.
> WARNING: No sibling found for CPU 1.
> WARNING: No sibling found for CPU 2.
> WARNING: No sibling found for CPU 3.
> 
> Recent 2.4.x kernels (starting with 2.4.20 IIRC) support
> Hyperthreading on this machine (Siemens Primergy H450).
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

Re: [2.6.0-test3] Hyperthreading gone

[Florian Weimer]

Greg Norris <haphazard@kc.rr.com> writes:

> Did you select CPU Enumeration Only, or "normal" ACPI?

CPU Enumeration Only.

> If the former, did you specify the "acpismp=force" parameter at
> bootup?

I didn't.  Previous experience (with some 2.5.x versions) indicates
that Linux does not support full ACPI on this machine.  The
documentation suggests that the command line option enables full ACPI,
so I hesitate to do this.

Re: [2.6.0-test3] Hyperthreading gone

[Greg Norris]

On Sun, Aug 10, 2003 at 09:03:42AM +0200, Florian Weimer wrote:
> I didn't.  Previous experience (with some 2.5.x versions) indicates
> that Linux does not support full ACPI on this machine.  The
> documentation suggests that the command line option enables full ACPI,
> so I hesitate to do this.

According to the 2.6.0-test3 menuconfig help text, the parameter is
required when CPU Enumeration Only is selected, and enables only
limited ACPI support.  For whatever it's worth, that matches my
experience.


   CONFIG_ACPI_HT_ONLY:

   This option enables limited ACPI support -- just enough to
   enumerate processors from the ACPI Multiple APIC Description
   Table (MADT).  Note that ACPI supports both logical (e.g. Hyper-
   Threading) and physical processors, where the MultiProcessor
   Specification (MPS) table only supports physical processors. 

   Full ACPI support (CONFIG_ACPI) is preferred.  Use this option
   only if you wish to limit ACPI's role to processor enumeration. 

   In this configuration, ACPI defaults to off. It must be enabled
   on the command-line with the "acpismp=force" option. 
 

Re: [2.6.0-test3] Hyperthreading gone

[Florian Weimer]

Greg Norris <haphazard@kc.rr.com> writes:

> According to the 2.6.0-test3 menuconfig help text, the parameter is
> required when CPU Enumeration Only is selected, and enables only
> limited ACPI support.

I don't think it's clear from the description.  It's certainly
unexpected that a compile-time option doesn't activate a feature, but
merely adds a boot option to do so.

Anyway, I can't test right now because 2.6 is still eating the file
system. 8-(

Re: [2.6.0-test3] Hyperthreading gone

[Hugh Dickins]

Hi Len,

On Sun, 10 Aug 2003, Florian Weimer wrote:
> Greg Norris <haphazard@kc.rr.com> writes:
> 
> > Did you select CPU Enumeration Only, or "normal" ACPI?
> 
> CPU Enumeration Only.
> 
> > If the former, did you specify the "acpismp=force" parameter at
> > bootup?
> 
> I didn't.  Previous experience (with some 2.5.x versions) indicates
> that Linux does not support full ACPI on this machine.  The
> documentation suggests that the command line option enables full ACPI,
> so I hesitate to do this.

Florian, at the moment, in 2.4 and in 2.6, you do have to specify the
"acpismp=force" boot parameter to get HT to work with CPU Enumeration
Only: it can't enable full ACPI since you don't have full ACPI built in,
so no need to hesitate.  But of course it's stupid, and the ACPI guys
agree it's wrong and to be fixed.

Len, what's up with this?  I'm not worried about 2.6 right now, but
4 weeks ago you were about to submit a patch to fix this for 2.4.22,
which is now at 2.4.22-rc2 and still behaving as broken in -pre1.

Is it time to dig out my own patch and send to Marcelo again?

Hugh

Re: [2.6.0-test3] Hyperthreading gone

[Florian Weimer]

Hugh Dickins <hugh@veritas.com> writes:

> Florian, at the moment, in 2.4 and in 2.6, you do have to specify the
> "acpismp=force" boot parameter to get HT to work with CPU Enumeration
> Only:

With 2.4, I get hyperthreading without any ACPI configuration option.

Re: [2.6.0-test3] Hyperthreading gone

[Hugh Dickins]

On Mon, 11 Aug 2003, Florian Weimer wrote:
> Hugh Dickins <hugh@veritas.com> writes:
> 
> > Florian, at the moment, in 2.4 and in 2.6, you do have to specify the
> > "acpismp=force" boot parameter to get HT to work with CPU Enumeration
> > Only:
> 
> With 2.4, I get hyperthreading without any ACPI configuration option.

In 2.4.which?  When I said "at the moment", I was meaning "latest",
2.4.22-pre1 through 2.4.22-rc2.  Sure, 2.4.21 and a few earlier could
do HyperThreading without CONFIG_ACPI, but 2.4.22-pre1 changed that.

Hugh

RE: [2.6.0-test3] Hyperthreading gone

[Brown, Len]

Hugh,
My changes go to Marcelo via Andy.  This one has been waiting in his
staging area while he was out on vacation.  Now that he is back --
unless something broke in his tree -- I assume he'll be sending it along
to Marcelo shortly.

Cheers,
-Len

Ps. If you'd like to see the code, here it is:
Andy's tree:
http://linux-acpi.bkbits.net:8080/linux-acpi-2.4
Len's tree:
http://linux-acpi.bkbits.net:8080/to-andy-2.4

Pps. Feel free to use my intel e-mail account -- I use my yahoo account
mostly to reduce spam so I don't read it every day.

> -----Original Message-----
> From: Hugh Dickins [mailto:hugh@veritas.com] 
> Sent: Monday, August 11, 2003 12:53 PM
> To: Len Brown
> Cc: Florian Weimer; Grover, Andrew; Marcelo Tosatti; 
> linux-kernel@vger.kernel.org
> Subject: Re: [2.6.0-test3] Hyperthreading gone
> 
> 
> Hi Len,
> 
> On Sun, 10 Aug 2003, Florian Weimer wrote:
> > Greg Norris <haphazard@kc.rr.com> writes:
> > 
> > > Did you select CPU Enumeration Only, or "normal" ACPI?
> > 
> > CPU Enumeration Only.
> > 
> > > If the former, did you specify the "acpismp=force" parameter at
> > > bootup?
> > 
> > I didn't.  Previous experience (with some 2.5.x versions) indicates
> > that Linux does not support full ACPI on this machine.  The
> > documentation suggests that the command line option enables 
> full ACPI,
> > so I hesitate to do this.
> 
> Florian, at the moment, in 2.4 and in 2.6, you do have to specify the
> "acpismp=force" boot parameter to get HT to work with CPU Enumeration
> Only: it can't enable full ACPI since you don't have full 
> ACPI built in,
> so no need to hesitate.  But of course it's stupid, and the ACPI guys
> agree it's wrong and to be fixed.
> 
> Len, what's up with this?  I'm not worried about 2.6 right now, but
> 4 weeks ago you were about to submit a patch to fix this for 2.4.22,
> which is now at 2.4.22-rc2 and still behaving as broken in -pre1.
> 
> Is it time to dig out my own patch and send to Marcelo again?
> 
> Hugh
> 
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RE: [2.6.0-test3] Hyperthreading gone

[Marcelo Tosatti]

On Tue, 12 Aug 2003, Brown, Len wrote:

> Hugh,
> My changes go to Marcelo via Andy.  This one has been waiting in his
> staging area while he was out on vacation.  Now that he is back --
> unless something broke in his tree -- I assume he'll be sending it along
> to Marcelo shortly.

Good to know. Andrew, I'll wait for you on those updates to release -rc3.