CONFIG_4KSTACKS in mm2?

CONFIG_4KSTACKS in mm2?

[Ralf Hildebrandt]

Is there a way of disabling CONFIG_4KSTACKS in 2.6.5-mm2? 
Or to make it configurable?

-- 
Ralf Hildebrandt (Im Auftrag des Referat V a)   Ralf.Hildebrandt@charite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin    Fax.  +49 (0)30-450 570-916
IT-Zentrum Standort Campus Mitte                          AIM.  ralfpostfix

Re: CONFIG_4KSTACKS in mm2?

[Zwane Mwaikambo]

On Wed, 7 Apr 2004, Ralf Hildebrandt wrote:

> Is there a way of disabling CONFIG_4KSTACKS in 2.6.5-mm2?
> Or to make it configurable?

"arch/i386/Kconfig" line 1498 of 1542 --97%-- col 8
config 4KSTACKS
        def_bool y

you could just change that to 'n'

Re: CONFIG_4KSTACKS in mm2?

[Ralf Hildebrandt]

* Zwane Mwaikambo <zwane@linuxpower.ca>:

> > Is there a way of disabling CONFIG_4KSTACKS in 2.6.5-mm2?
> > Or to make it configurable?
> 
> "arch/i386/Kconfig" line 1498 of 1542 --97%-- col 8
> config 4KSTACKS
>         def_bool y
> 
> you could just change that to 'n'

That's what I did (and it works) -- but it's not really intuitive or
even configurable (in the way of menuconfig or something).

-- 
Ralf Hildebrandt (Im Auftrag des Referat V a)   Ralf.Hildebrandt@charite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin    Fax.  +49 (0)30-450 570-916
IT-Zentrum Standort Campus Mitte                          AIM.  ralfpostfix

Re: CONFIG_4KSTACKS in mm2?

[Martin Zwickel]

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On Wed, 7 Apr 2004 16:03:47 +0200
Ralf Hildebrandt <Ralf.Hildebrandt@charite.de> bubbled:

> * Zwane Mwaikambo <zwane@linuxpower.ca>:
> 
> > > Is there a way of disabling CONFIG_4KSTACKS in 2.6.5-mm2?
> > > Or to make it configurable?
> > 
> > "arch/i386/Kconfig" line 1498 of 1542 --97%-- col 8
> > config 4KSTACKS
> >         def_bool y
> > 
> > you could just change that to 'n'
> 
> That's what I did (and it works) -- but it's not really intuitive or
> even configurable (in the way of menuconfig or something).
> 

here is the patch to reenable the menu config option ...

-- 
MyExcuse:
What office are you in? Oh, that one.  Did you know that your building was built
over the universities first nuclear research site? And wow, aren't you the lucky
one, your office is right over where the core is buried!

Martin Zwickel <martin.zwickel@technotrend.de>
Research & Development

TechnoTrend AG <http://www.technotrend.de>

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diff -Naurp linux-2.6.5-rc1-mm1/arch/i386/Kconfig linux-2.6.5-rc1-mm1-removed/arch/i386/Kconfig
--- linux-2.6.5-rc1-mm1/arch/i386/Kconfig	2004-03-16 21:28:03.000000000 +0100
+++ linux-2.6.5-rc1-mm1-removed/arch/i386/Kconfig	2004-03-16 21:32:08.000000000 +0100
@@ -1555,7 +1555,14 @@ config MAGIC_SYSRQ
 	default y
 
 config 4KSTACKS
-	def_bool y
+	bool "Use 4Kb for kernel stacks instead of 8Kb"
+	default n
+	help
+	  If you say Y here the kernel will use a 4Kb stacksize for the
+	  kernel stack attached to each process/thread. This facilitates
+	  running more threads on a system and also reduces the pressure
+	  on the VM subsystem for higher order allocations. This option
+	  will also use IRQ stacks to compensate for the reduced stackspace.
 
 config X86_FIND_SMP_CONFIG
 	bool


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Re: CONFIG_4KSTACKS in mm2?

[Zwane Mwaikambo]

On Wed, 7 Apr 2004, Ralf Hildebrandt wrote:

> * Zwane Mwaikambo <zwane@linuxpower.ca>:
>
> > > Is there a way of disabling CONFIG_4KSTACKS in 2.6.5-mm2?
> > > Or to make it configurable?
> >
> > "arch/i386/Kconfig" line 1498 of 1542 --97%-- col 8
> > config 4KSTACKS
> >         def_bool y
> >
> > you could just change that to 'n'
>
> That's what I did (and it works) -- but it's not really intuitive or
> even configurable (in the way of menuconfig or something).

Andrew Morton turned it on unconditionally on purpose for wider testing.

Re: CONFIG_4KSTACKS in mm2?

[Ralf Hildebrandt]

* Zwane Mwaikambo <zwane@linuxpower.ca>:

> > That's what I did (and it works) -- but it's not really intuitive or
> > even configurable (in the way of menuconfig or something).
> 
> Andrew Morton turned it on unconditionally on purpose for wider testing.

Yep. It doesn't work with Nvidia's nvidia kernel drivers. But what's
new :)

-- 
Ralf Hildebrandt (Im Auftrag des Referat V a)   Ralf.Hildebrandt@charite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin    Fax.  +49 (0)30-450 570-916
IT-Zentrum Standort Campus Mitte                          AIM.  ralfpostfix

Re: CONFIG_4KSTACKS in mm2?

[Sid Boyce]

Ralf Hindlebrand wrote:
* Zwane Mwaikambo <zwane@xxxxxxxxxxxxx>:

 > >/ > That's what I did (and it works) -- but it's not really 
intuitive or/
 > >/ > even configurable (in the way of menuconfig or something)./
 >/  >/
 > >/ Andrew Morton turned it on unconditionally on purpose for wider 
testing./

 > Yep. It doesn't work with Nvidia's nvidia kernel drivers. But what's
 > new :)

What's new is that I forgot to turn it off, I'd been running 2.6.5-cko1, 
built 2.6.5-mm1, booted up and installed nvidia kernel for it. I ended 
up with a trashed HD which needed reformatiing and a fresh install. I 
don't know what symptoms I should have seen, perhaps nvidia failing to 
work. I suspect it was a combination of 4K_STACKS and some hardware bug 
for which I am going to change the motherboard, memory and Athlon CPU as 
I've had odd hangs during boot. A few boots hung, finally I disabled 
level 2 cache and it came up, so I think I will leave the next bootup 
till the new stuff is installed. I previously had a hard drive that 
would not boot fully after starting X with nvidia, though it's mountable 
as hdc1 and I can get at all the stuff I need.
Regards
Sid.