| 1 |
Volker Armin Hemmann schrieb: |
| 2 |
> On Mittwoch 18 November 2009, Alan McKinnon wrote: |
| 3 |
>> On Wednesday 18 November 2009 01:16:04 Stefan G. Weichinger wrote: |
| 4 |
>>> Volker Armin Hemmann schrieb: |
| 5 |
>>>> Namespaces - you don't need it? Kick 'em out. |
| 6 |
>>> hmm, interesting ... ;-) |
| 7 |
>>> |
| 8 |
>>> for sure I also want to decrapify my kernel-config ... |
| 9 |
>>> |
| 10 |
>>> To disable namespaces I would have to set CONFIG_EMBEDDED=y ... correct? |
| 11 |
>>> |
| 12 |
>>> This is rather counterintuitive to me, as my main workstation is far |
| 13 |
>>> from an embedded or small system (ok, not compared to the |
| 14 |
>>> 4096-cpu-clusters in http://xkcd.com/619/ , but compared to, for |
| 15 |
>>> example, my embedded ALIX-PC I use as fw/router/something ...). |
| 16 |
>>> |
| 17 |
>>> So you suggest I set CONFIG_EMBEDDED=y and in turn get several new |
| 18 |
>>> options/defaults to choose and get right or wrong ... ? |
| 19 |
>>> |
| 20 |
>>> ;-) |
| 21 |
>>> |
| 22 |
>>> I am quite sure to have at least *some* crap in my config as I tend to |
| 23 |
>>> always do something like |
| 24 |
>>> |
| 25 |
>>> zcat /proc/config.gz >> /usr/src/linux-new-shiny-version/.config |
| 26 |
>>> make oldconfig |
| 27 |
>>> |
| 28 |
>>> .... |
| 29 |
>>> |
| 30 |
>>> This gives me expected results and a "it boots OK" experience, getting |
| 31 |
>>> rid of unused crap is another issue, yes. |
| 32 |
>>> |
| 33 |
>>> I wonder which EMBEDDED options would help me ... |
| 34 |
>> Likely none of them. |
| 35 |
>> |
| 36 |
>> The embedded menu is the most counter-intuitive thing in the whole kernel |
| 37 |
>> config. It does not supply a list of things you may enable, instead it |
| 38 |
>> activates a menu that allows you to switch stuff OFF that is normally ON. |
| 39 |
>> |
| 40 |
>> The rationale is that embedded devices need to get by on a very slim kernel |
| 41 |
>> and with some magic trickery they can successfully disable some features |
| 42 |
>> that are usually considered perfectly normal for regular desktop use. |
| 43 |
>> |
| 44 |
>> For example: CONFIG_HOTPLUG. It's unthinkable to remove this for a desktop, |
| 45 |
>> but does your TomTom need it? Does a GPS even have hotplug facilities? How |
| 46 |
>> about ADSL router/modems? |
| 47 |
>> |
| 48 |
>> To disable namespace, enable embedded, leave everything on, and you will |
| 49 |
>> find you can now disable namespaces. |
| 50 |
>> |
| 51 |
> |
| 52 |
> you can disable: |
| 53 |
> - Enable 16-bit UID system calls |
| 54 |
> |
| 55 |
> - Sysctl syscall support |
| 56 |
> without negative impact on a desktop. Most of it is broken for years anyway. |
| 57 |
> |
| 58 |
> - Core dumps |
| 59 |
> are another feature that most people never use |
| 60 |
> |
| 61 |
> - Load all symbols for debugging/ksymoops |
| 62 |
> and |
| 63 |
> - Do an extra kallsyms pass |
| 64 |
> stuff you can deactivate if you don't plan to send crash reports. |
| 65 |
> |
| 66 |
> - Enable PC-Speaker support |
| 67 |
> oh hell - away with that one! Who needs beeps anyway? |
| 68 |
|
| 69 |
whoops. I hadn't looked back at that thread for weeks, only found it now. |
| 70 |
|
| 71 |
Thanks for your replies .... |
Archives