Re: [gentoo-user] Re: Cohorent pool size too small...

[meino.cramer@gmx.de]

Hinnerk van Bruinehsen <h.v.bruinehsen@fu-berlin.de> [14-10-07 17:23]:
> On Mon, Oct 06, 2014 at 06:34:06PM +0200, meino.cramer@gmx.de wrote:
> <SNIP>
> > 
> > Moin Hinnerk, 
> > (hopefully have guessed this greet correctly...I am from that
> > part of Germany ;)
> > 
> > I have the source of the driver exclusivly compiled for 3.8.13
> > as for 3.14.something (cant remember). 
> > 3.14.x has some other problems (on that embedded platform) like
> > not powering off when shutdown, random reboots and such.
> > So decided to go back to 3.8.13.
> > Yesterday I started updateing (eix-sync and emerge) that Gentoo
> > and it ends up in an endless loop (bash update) of configureing
> > (damn slow on that mini iron) and compiling - as it looks -
> > of a single file.
> > After more than 10 hours I CTRL-C that, reupated and now I am
> > ...updateing the bash again.
> > Sigh.
> > Currently "fun" is something else...
> > 
> > Is the 3.15.10++ branch free of things like random reboot and
> > not powering off?
> 
> Moin Meino,
> 
> (you've hit dead on spot: is there another "valid" greeting except that one?
> ;-) )
> 
> Right now I don't have a beaglebone black so sadly I can't provide any first
> hand experience.
> A 10 hour configure loop definitely sounds fishy to me. I'm running
> a (hardened) Gentoo on a Raspberry Pi right now and I do compiling natively
> most of the time (as it's not a that critical machine). As it's an even more
> mini iron I know that it can be time consuming (maybe interesting: bash: 25
> minutes, 57 seconds for 29 merges).
> My rpi runs on a 3.16.3 kernel and my experience is that newer kernels help
> immensely if available (that is if the hardware is either supported upstream or
> there is a vendor branch testing new kernels). Especially for arm there is much
> better support lately.
> I find for less used platforms (read: "not-x86/amd64) the newer kernels are
> often more stable than "stable" ones because the latter often doesn't
> experience much testing.
> 
> So in the end there aren't many more options than just try it out (kernel
> builds are quick luckily because - as you stated in your other reply - kernel
> builds are very easily cross-compilable).
> 
> Good luck/Viel Erfolg,
> 
> Hinnerk

Moin Hinnerk,

(yes, exactly what you have said: "Moin" is the way to go!!! :)) 8)))))

The problem with the kernel sources here on the beagle bone side of
the street arises not from the kernel sources themselve -- so to speak
the Torvaldic parts of Kernaltica -- but more from the parts which
were implemented and designed to speak to the hardware itsself.
3.8.x has good "cape" support  ("cape": additonal pluggable PCBs)but
less good USB and ethernet.
3.14.x has better ethernet and USB but does not switch off the board
if shutdown (aka "battery eater") and does random reboots. The GPIOs
for the "capes" have to be configured more or less manually with
3.14.x.
Now I am experimenting with 3.15.x...we will see.
The whole process from "I want" to "I have" is time consuming,
because each time a lot of sources are downloaded and my DSL is 
"old school" ;)

Thanks a lot for your help!
Viele Dank für Deine Hilfe! :)

Meino