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Property:buddyinfo
| BoxMatrix >> System >> buddyinfo | @ BoxMatrix - IRC-Chat - Translate: de es fr it nl pl |
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Procfs-Object
| Procfs-Object: | buddyinfo - type File | Wiki | Freetz | IPPF | whmf | AVM | Web |
| Location: | System >> Proc-Filesystem - Origin: Linux | ||||||
| Path: | /proc | ||||||
| Properties: | Firmware: 4.33 - 7.90 - Kernel (perm): 2.6.13.1 (r), 2.6.28.10 (r), 2.6.32.60 (r), 2.6.32.61 (r), 2.6.39.4 (r), 3.10.107 (r), 3.10.73 (r), 4.1.38 (r), 4.1.52 (r), 4.19.183 (r), 4.4.271 (r), 4.4.60 (r), 4.9.198 (r), 4.9.218 (r), 4.9.250 (r), 4.9.325 (r) | ||||||
| Function: | Kernel memory allocator info for diagnosing memory fragmentation. | ||||||
Goto: Examples - Dependencies - Model-Matrix - Help Supportdata2 - SMW-Browser
Details
buddyinfo provides Kernel memory allocator information for diagnosing memory fragmentation issues.
Supportdata2 includes buddyinfo in the Meminfo section since sd2-09.
In Supportdata-Probes it is included since fw X.XX, but it's not parsed for BoxMatrix yet.
Excerpt from the proc(5) man page:
/proc/buddyinfo
This file contains information which is used for
diagnosing memory fragmentation issues. Each line starts
with the identification of the node and the name of the
zone which together identify a memory region. This is
then followed by the count of available chunks of a
certain order in which these zones are split. The size in
bytes of a certain order is given by the formula:
(2^order) * PAGE_SIZE
The binary buddy allocator algorithm inside the kernel
will split one chunk into two chunks of a smaller order
(thus with half the size) or combine two contiguous chunks
into one larger chunk of a higher order (thus with double
the size) to satisfy allocation requests and to counter
memory fragmentation. The order matches the column
number, when starting to count at zero.
For example on an x86-64 system:
Node 0, zone DMA 1 1 1 0 2 1 1 0 1 1 3
Node 0, zone DMA32 65 47 4 81 52 28 13 10 5 1 404
Node 0, zone Normal 216 55 189 101 84 38 37 27 5 3 587
In this example, there is one node containing three zones
and there are 11 different chunk sizes. If the page size
is 4 kilobytes, then the first zone called DMA (on x86 the
first 16 megabyte of memory) has 1 chunk of 4 kilobytes
(order 0) available and has 3 chunks of 4 megabytes (order
10) available.
If the memory is heavily fragmented, the counters for
higher order chunks will be zero and allocation of large
contiguous areas will fail.
Further information about the zones can be found in
/proc/zoneinfo.
Excerpt from the Kernel.org /proc filesystem documentation:
> cat /proc/buddyinfo Node 0, zone DMA 0 4 5 4 4 3 ... Node 0, zone Normal 1 0 0 1 101 8 ... Node 0, zone HighMem 2 0 0 1 1 0 ... External fragmentation is a problem under some workloads, and buddyinfo is a useful tool for helping diagnose these problems. Buddyinfo will give you a clue as to how big an area you can safely allocate, or why a previous allocation failed. Each column represents the number of pages of a certain order which are available. In this case, there are 0 chunks of 2^0*PAGE_SIZE available in ZONE_DMA, 4 chunks of 2^1*PAGE_SIZE in ZONE_DMA, 101 chunks of 2^4*PAGE_SIZE available in ZONE_NORMAL, etc... More information relevant to external fragmentation can be found in pagetypeinfo.
Examples
6490 fw 7.29 examples:
root@fritz2:/var/mod/root# cat /proc/buddyinfo Node 0, zone DMA 0 0 1 1 1 0 0 0 1 1 3 Node 0, zone Normal 283 152 103 35 13 11 2 3 2 2 5 root@fritz2:/var/mod/root# rpc cat /proc/buddyinfo Node 0, zone Normal 39 21 18 6 2 1 2 2 1 1 41
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: 2024-04-25 04:26 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 SL WLAN | 4.34 | /proc | 2.6.13.1 (r) |
| FRITZ!Box WLAN 3020 | 4.34 | /proc | 2.6.13.1 (r) |
| FRITZ!Box 3490 | 7.30 | /proc | 3.10.107 (r) |
| FRITZ!Box 4020 | 7.01 | /proc | 4.4.60 (r) |
| FRITZ!Box 4060 | 7.30 - 7.39 | /proc | 4.4.271 (r), 4.4.60 (r) |
| FRITZ!Box 5490 | 7.29 | /proc | 3.10.107 (r) |
| FRITZ!Box 5590 Fiber (arm) | 7.29 | /proc | 4.4.60 (r) |
| FRITZ!Box 6360 Cable | 5.20 | /proc | 2.6.28.10 (r) |
| FRITZ!Box 6430 Cable (arm) | 7.29 | /proc | 2.6.39.4 (r) |
| FRITZ!Box 6430 Cable (atom) | 7.29 | /proc | 2.6.39.4 (r) |
| FRITZ!Box 6490 Cable (arm) | 7.29 - 7.39 | /proc | 2.6.39.4 (r) |
| FRITZ!Box 6490 Cable (atom) | 7.29 - 7.39 | /proc | 2.6.39.4 (r) |
| FRITZ!Box 6660 Cable (atom) | 7.29 | /proc | 4.9.250 (r) |
| FRITZ!Box 6850 LTE | 7.39 | /proc | 4.4.60 (r) |
| FRITZ!Box 6850 5G | 7.39 | /proc | 4.4.60 (r) |
| FRITZ!Box Fon WLAN 7050 | 4.33 | /proc | 2.6.13.1 (r) |
| FRITZ!Box Fon WLAN 7140 | 4.33 | /proc | 2.6.13.1 (r) |
| FRITZ!Fon 7150 | 4.72 | /proc | 2.6.13.1 (r) |
| FRITZ!Box Fon WLAN 7240 | 6.06 | /proc | 2.6.32.60 (r) |
| FRITZ!Box 7272 | 6.88 | /proc | 2.6.32.61 (r) |
| FRITZ!Box Fon WLAN 7320 | 6.55 | /proc | 2.6.32.61 (r) |
| FRITZ!Box 7362 SL | 7.12 | /proc | 3.10.107 (r) |
| FRITZ!Box Fon WLAN 7390 | 6.04 | /proc | 2.6.28.10 (r) |
| FRITZ!Box 7412 | 6.87 | /proc | 3.10.73 (r) |
| FRITZ!Box 7430 | 7.29 | /proc | 3.10.107 (r) |
| FRITZ!Box 7490 | 7.29 - 7.51 | /proc | 3.10.107 (r) |
| FRITZ!Box 7510 | 7.30 | /proc | 4.4.60 (r) |
| FRITZ!Box 7520 | 7.29 - 7.50 | /proc | 4.4.271 (r), 4.4.60 (r) |
| FRITZ!Box 7520 v2 | 7.31 | /proc | 4.4.60 (r) |
| FRITZ!Box 7530 | 7.39 | /proc | 4.4.271 (r) |
| FRITZ!Box 7530 AX | 7.31 - 7.51 | /proc | 4.1.52 (r), 4.19.183 (r) |
| FRITZ!Box 7581 | 7.17 | /proc | 4.1.38 (r) |
| FRITZ!Box 7590 | 7.57 - 7.90 | /proc | 4.9.325 (r) |
| FRITZ!Box 7590 AX | 7.31 - 7.39 | /proc | 4.9.198 (r), 4.9.218 (r) |
| FRITZ!Smart Gateway | 7.57 - 7.58 | /proc | 4.4.271 (r) |
| FRITZ!Repeater 1200 AX | 7.30 - 7.39 | /proc | 4.4.60 (r) |
| FRITZ!WLAN Repeater 1750E | 7.29 | /proc | 4.4.60 (r) |
| FRITZ!Repeater 6000 | 7.29 - 7.39 | /proc | 4.4.60 (r) |
| 38 models use 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!
