Property:smtc

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Procfs-Object

Procfs-Object:	smtc   -   type File	Wiki	Freetz	IPPF	whmf	AVM	Web
Location:	System >> Proc-Filesystem   -   Origin: Linux
Path:	/proc
Properties:	Firmware: 6.87   -   Kernel (perm): 3.10.73 (r)
Function:	MIPS TC SMTC statistics.

Goto:   Examples  -  Dependencies   -   Model-Matrix   -   Help Supportdata2   -   SMW-Browser

Details

smtc provides MIPS TC SMTC statistics. smtc is provided by smtc-proc.ko.

To understand the naming hierarchy in MIPS world:

• CPU = physical CPU which can have multiple:
• Cores = physical CPU core which can have multiple:
• VPEs = Virtual Processing Elements (similar to hyperthreading cores) which can have multiple:
• TCs = Thread Contexts

Normally VPEs are used as virtual cores in Linux, with SMTC the TCs are used as virtual cores.

Supportdata2 includes smtc in the CPUinfo section since sd2-10.
In Supportdata-Probes it was never included (up to fw 7.39).

SMTC is enabled by CONFIG_MIPS_MT_SMTC, excerpt from arch/mips/Kconfig:

Use all TCs on all VPEs for SMP (DEPRECATED)

    Help text 3.14–3.15:

    This is a kernel model which is known as SMTC. This is supported on cores with the MT ASE and 
    presents all TCs available on all VPEs to support SMP. 

    Help text 2.6.17–3.13:

    This is a kernel model which is known a SMTC or lately has been marketesed into SMVP. is 
    presenting the available TC's of the core as processors to Linux. On currently available 34K 
    processors this means a Linux system will see up to 5 processors. The implementation of the 
    SMTC kernel differs significantly from VSMP and cannot efficiently coexist in the same kernel
    binary so the choice between VSMP and SMTC is a compile time decision.

Excerpt from the Linux MIPS Wiki 34K article;

SMTC

    is presenting the available TCs of the core as processors to Linux. On currently available 34K
    processors this means a Linux system will see up to 5 processors. The implementation of the 
    SMTC kernel differs significantly from VSMP. It was found that SMTC cannot efficiently coexist 
    in the same kernel binary with other modes of multiprocessor support, so enabling SMTC is a 
    compile time decision. The choice between VSMP and SMTC is a bit delicate as it is affected by
    clockspeed, memory speed, the specific workload and other factors. As such the choice should 
    not be made on an evaluation board such as the Malta but preferably on the final target 
    hardware. Kevin Kissel's presentation provides further details. 

Alternative location: Kevin Kissel's presentation.

Examples

7412 fw 6.87 example:

root@fritz:/var/mod/root# cat /proc/smtc

SMTC Status Word: 0x00000003
Config7: 0x80080400
EBASE: 0x81d00000
Counter Interrupts taken per CPU (TC)
0: 0
1: 0
Self-IPIs by CPU:
0: 104627
1: 97329
0 Recoveries of "stolen" FPU

Dependencies

Daily updated index of all dependencies of this object. Last update: GMT.
A ** in the Mod column marks info from Supportdata2 probes, which will always stay incomplete.
A - in the Mod column marks manual research, the Firmware then shows where the Object occurs, not the Relation.

Relation	Typ	Object	Mod	Firmware	Info	Origin
0 dependencies for this object

Model-Matrix

Daily updated index of the presence, path and size of this object for each model. Last update: 2024-04-19 04:27 GMT.
Showing all models using this object. Click any column header (click-wait-click) to sort the list by the respective data.
The (main/scrpn/boot/arm/prx/atom) label in the Model column shows which CPU is meant for models with multiple Linux instances.
Note that this list comes from Supportdata2 probes, which can have arbitrary settings and come from different firmware versions.
It doesn't say much if a model is not listed here. It may be a missing supportdata2 file or just a disabled feature.

Model	Firmware	Path	Kernel (perm)
FRITZ!Box 7412	6.87	/proc	3.10.73 (r)
1 model uses this object

Help Supportdata2

The data in this article is incomplete since it was manually collected using the Supportdata2 project.

Unlike the Supportdata-Probes which have been collected for years Supportdata2 is brand new and only has a few probes.
If you have access to a shell then please help to extend the Supportdata2 collection to improve this data.

It's easy and it's done in minutes. Please send created data as an Email attachment to the address listed here. Thanks!

SMW-Browser

Property:smtc

Information is currently being retrieved from the backend.