[gentoo-user] Missing CPU options in make menuconfig

[gentoo-user] Missing CPU options in make menuconfig

[Neil Bothwick]

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I'm trying to do something with a vanilla kernel from kernel.org. Under
Processor type and features/Processor family, there are only a handful of
choices, whereas my portage-installed gentoo-sources lists many more.

The help page on the vanilla sources shows the full list, but they are
not available to pick and the help does not mentions an option to enable
to show these.

What do I need to enable?

-- 
Neil Bothwick

For security reasons, all text in this mail
  is double-rot13 encrypted.

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Re: [gentoo-user] Missing CPU options in make menuconfig

[Alexander Kapshuk]

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On Wed, Jul 20, 2016 at 8:50 PM, Neil Bothwick <neil@digimed.co.uk> wrote:

> I'm trying to do something with a vanilla kernel from kernel.org. Under
> Processor type and features/Processor family, there are only a handful of
> choices, whereas my portage-installed gentoo-sources lists many more.
>
> The help page on the vanilla sources shows the full list, but they are
> not available to pick and the help does not mentions an option to enable
> to show these.
>
> What do I need to enable?
>
> --
> Neil Bothwick
>
> For security reasons, all text in this mail
>   is double-rot13 encrypted.
>

Running a vanilla kernel here:

uname -r
4.6.4-vanilla

I've counted 24 CPUs listed in my '.config'.

Which one are you after?

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[gentoo-user] Re: Missing CPU options in make menuconfig

[Holger Hoffstätte]

On Wed, 20 Jul 2016 18:50:56 +0100, Neil Bothwick wrote:

> I'm trying to do something with a vanilla kernel from kernel.org. Under
> Processor type and features/Processor family, there are only a handful of
> choices, whereas my portage-installed gentoo-sources lists many more.
> 
> The help page on the vanilla sources shows the full list, but they are
> not available to pick and the help does not mentions an option to enable
> to show these.
> 
> What do I need to enable?

https://github.com/graysky2/kernel_gcc_patch

is what's missing in mainline but part of -gentoo.

-h

Re: [gentoo-user] Missing CPU options in make menuconfig

[Fernando Rodriguez]

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Hash: SHA256

On 07/20/2016 01:50 PM, Neil Bothwick wrote:
> I'm trying to do something with a vanilla kernel from kernel.org. Under
> Processor type and features/Processor family, there are only a handful of
> choices, whereas my portage-installed gentoo-sources lists many more.
> 
> The help page on the vanilla sources shows the full list, but they are
> not available to pick and the help does not mentions an option to enable
> to show these.
> 
> What do I need to enable?
> 

I don't use gentoo sources but I remember reading about gentoo patches
for processor specific optimizations and being tempted to try them. Is it
possible that is what you're refering to?

The vanilla sources only shows 5 choices for me on amd64:
(X) Opteron/Athlon64/Hammer/K8
( ) Intel P4 / older Netburst based Xeon
( ) Core 2/newer Xeon
( ) Intel Atom
( ) Generic-x86-64

And it shows a different set of options when I run it on an x86 machine.


- -- 

Fernando Rodriguez
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Re: [gentoo-user] Missing CPU options in make menuconfig

[Neil Bothwick]

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On Wed, 20 Jul 2016 14:33:04 -0400, Fernando Rodriguez wrote:

> I don't use gentoo sources but I remember reading about gentoo patches
> for processor specific optimizations and being tempted to try them. Is
> it possible that is what you're refering to?
> 
> The vanilla sources only shows 5 choices for me on amd64:
> (X) Opteron/Athlon64/Hammer/K8
> ( ) Intel P4 / older Netburst based Xeon
> ( ) Core 2/newer Xeon
> ( ) Intel Atom
> ( ) Generic-x86-64
> 
> And it shows a different set of options when I run it on an x86 machine.

That's what I get here, but help lists all the ones I get in
gentoo-sources, apart from MNATIVE, which indicates to me that those
options should be available, once I work out how to switch them on.


-- 
Neil Bothwick

Processor: (n.) a device for converting sense to nonsense at the speed
           of electricity, or (rarely) the reverse.

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Re: [gentoo-user] Missing CPU options in make menuconfig

[Fernando Rodriguez]

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Hash: SHA256

On 07/20/2016 02:54 PM, Neil Bothwick wrote:
> On Wed, 20 Jul 2016 14:33:04 -0400, Fernando Rodriguez wrote:
> 
>> I don't use gentoo sources but I remember reading about gentoo patches
>> for processor specific optimizations and being tempted to try them. Is
>> it possible that is what you're refering to?
>>
>> The vanilla sources only shows 5 choices for me on amd64:
>> (X) Opteron/Athlon64/Hammer/K8
>> ( ) Intel P4 / older Netburst based Xeon
>> ( ) Core 2/newer Xeon
>> ( ) Intel Atom
>> ( ) Generic-x86-64
>>
>> And it shows a different set of options when I run it on an x86 machine.
> 
> That's what I get here, but help lists all the ones I get in
> gentoo-sources, apart from MNATIVE, which indicates to me that those
> options should be available, once I work out how to switch them on.

Disable CONFIG_64BIT and you'll get them all.


- -- 

Fernando Rodriguez
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Re: [gentoo-user] Missing CPU options in make menuconfig

[Fernando Rodriguez]

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Hash: SHA256

On 07/20/2016 07:38 PM, Fernando Rodriguez wrote:
> On 07/20/2016 02:54 PM, Neil Bothwick wrote:
>> On Wed, 20 Jul 2016 14:33:04 -0400, Fernando Rodriguez wrote:
> 
>>> I don't use gentoo sources but I remember reading about gentoo patches
>>> for processor specific optimizations and being tempted to try them. Is
>>> it possible that is what you're refering to?
>>>
>>> The vanilla sources only shows 5 choices for me on amd64:
>>> (X) Opteron/Athlon64/Hammer/K8
>>> ( ) Intel P4 / older Netburst based Xeon
>>> ( ) Core 2/newer Xeon
>>> ( ) Intel Atom
>>> ( ) Generic-x86-64
>>>
>>> And it shows a different set of options when I run it on an x86 machine.
> 
>> That's what I get here, but help lists all the ones I get in
>> gentoo-sources, apart from MNATIVE, which indicates to me that those
>> options should be available, once I work out how to switch them on.
> 
> Disable CONFIG_64BIT and you'll get them all.

And for future references, here's how I found out:

1. On the sources where you have the options highlight one of them and
   press ? (help). You'll see X86_32 under "Depends on:".

2. Hit ESC twice and then twice again to return to a menu with
   search functionality. Then type /X86_32 and hit enter. You'lll see that
   the option depends on !64BIT, so you need to disable CONFIG_64BIT for
   X86_32 to be available.

3. After disabling CONFIG_64BIT on the kernel where the options where missing
   I searched X86_32 again and this time it has [=y] next to it so it came
   on automatically and the options showed up but for some options you need to
   enable manually after enabling the dependencies.

- -- 

Fernando Rodriguez
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Re: [gentoo-user] Missing CPU options in make menuconfig

[Adam Carter]

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The experimental use flag turns on the other arch's in gentoo-sources.
Perhaps that will help identify which is the relevant patch?

On Thu, Jul 21, 2016 at 11:07 AM, Fernando Rodriguez <cyklonite@gmail.com>
wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> On 07/20/2016 07:38 PM, Fernando Rodriguez wrote:
> > On 07/20/2016 02:54 PM, Neil Bothwick wrote:
> >> On Wed, 20 Jul 2016 14:33:04 -0400, Fernando Rodriguez wrote:
> >
> >>> I don't use gentoo sources but I remember reading about gentoo patches
> >>> for processor specific optimizations and being tempted to try them. Is
> >>> it possible that is what you're refering to?
> >>>
> >>> The vanilla sources only shows 5 choices for me on amd64:
> >>> (X) Opteron/Athlon64/Hammer/K8
> >>> ( ) Intel P4 / older Netburst based Xeon
> >>> ( ) Core 2/newer Xeon
> >>> ( ) Intel Atom
> >>> ( ) Generic-x86-64
> >>>
> >>> And it shows a different set of options when I run it on an x86
> machine.
> >
> >> That's what I get here, but help lists all the ones I get in
> >> gentoo-sources, apart from MNATIVE, which indicates to me that those
> >> options should be available, once I work out how to switch them on.
> >
> > Disable CONFIG_64BIT and you'll get them all.
>
> And for future references, here's how I found out:
>
> 1. On the sources where you have the options highlight one of them and
>    press ? (help). You'll see X86_32 under "Depends on:".
>
> 2. Hit ESC twice and then twice again to return to a menu with
>    search functionality. Then type /X86_32 and hit enter. You'lll see that
>    the option depends on !64BIT, so you need to disable CONFIG_64BIT for
>    X86_32 to be available.
>
> 3. After disabling CONFIG_64BIT on the kernel where the options where
> missing
>    I searched X86_32 again and this time it has [=y] next to it so it came
>    on automatically and the options showed up but for some options you
> need to
>    enable manually after enabling the dependencies.
>
> - --
>
> Fernando Rodriguez
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Re: [gentoo-user] Missing CPU options in make menuconfig

[Neil Bothwick]

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On Wed, 20 Jul 2016 19:38:03 -0400, Fernando Rodriguez wrote:

> > That's what I get here, but help lists all the ones I get in
> > gentoo-sources, apart from MNATIVE, which indicates to me that those
> > options should be available, once I work out how to switch them on.  
> 
> Disable CONFIG_64BIT and you'll get them all.
> 
That only brings on the 32 bit ones.


-- 
Neil Bothwick

By the time you can make ends meet, they move the ends.

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Re: [gentoo-user] Missing CPU options in make menuconfig

[Neil Bothwick]

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On Thu, 21 Jul 2016 12:56:14 +1000, Adam Carter wrote:

> The experimental use flag turns on the other arch's in gentoo-sources.
> Perhaps that will help identify which is the relevant patch?

So they're all specific to gentoo-sources, not just the MNATIVE option?
Now it makes sense, thanks.


-- 
Neil Bothwick

RISC: Reduced Into Silly Code

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Re: [gentoo-user] Re: Missing CPU options in make menuconfig

[Neil Bothwick]

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On Wed, 20 Jul 2016 18:29:48 +0000 (UTC), Holger Hoffstätte wrote:

> https://github.com/graysky2/kernel_gcc_patch
> 
> is what's missing in mainline but part of -gentoo.

Now I understand, and can apply that patch separately, thanks for the
pointer.


-- 
Neil Bothwick

Top Oxymorons Number 18: Taped live

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Re: [gentoo-user] Missing CPU options in make menuconfig

[Fernando Rodriguez]

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Hash: SHA256

On 07/21/2016 03:17 AM, Neil Bothwick wrote:
> On Wed, 20 Jul 2016 19:38:03 -0400, Fernando Rodriguez wrote:
> 
>>> That's what I get here, but help lists all the ones I get in
>>> gentoo-sources, apart from MNATIVE, which indicates to me that those
>>> options should be available, once I work out how to switch them on.  
>>
>> Disable CONFIG_64BIT and you'll get them all.
>>
> That only brings on the 32 bit ones.

I thought that was what you meant because (at least on my sources from
upstream) help only shows 32 bit ones.


- -- 

Fernando Rodriguez
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Re: [gentoo-user] Missing CPU options in make menuconfig

[Fernando Rodriguez]

On 07/21/2016 06:56 AM, Fernando Rodriguez wrote:
> On 07/21/2016 03:17 AM, Neil Bothwick wrote:
>> On Wed, 20 Jul 2016 19:38:03 -0400, Fernando Rodriguez wrote:
> 
>>>> That's what I get here, but help lists all the ones I get in
>>>> gentoo-sources, apart from MNATIVE, which indicates to me that those
>>>> options should be available, once I work out how to switch them on.  
>>>
>>> Disable CONFIG_64BIT and you'll get them all.
>>>
>> That only brings on the 32 bit ones.
> 
> I thought that was what you meant because (at least on my sources from
> upstream) help only shows 32 bit ones.

I mean intel ones, it shows amd64 as well.

-- 

Fernando Rodriguez

Re: [gentoo-user] Re: Missing CPU options in make menuconfig

[Andrew Savchenko]

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On Thu, 21 Jul 2016 08:20:18 +0100 Neil Bothwick wrote:
> On Wed, 20 Jul 2016 18:29:48 +0000 (UTC), Holger Hoffstätte wrote:
> 
> > https://github.com/graysky2/kernel_gcc_patch
> > 
> > is what's missing in mainline but part of -gentoo.
> 
> Now I understand, and can apply that patch separately, thanks for the
> pointer.

Be careful with MNATIVE optimization. In some cases it results in
broken kernel: random userspace segfaults. See
https://github.com/graysky2/kernel_gcc_patch/issues/15

Best regards,
Andrew Savchenko

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