We believe that your issue has been closed by the upload of
Version 4.9.17-1+grml.1 of linux from Michael Prokop <mika@grml.org>.
The explanation is attached below

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Wed, 22 Mar 2017 16:44:19 +0100
Source: linux
Binary: linux-source-4.9 linux-support-4.9.0-1-grml linux-doc-4.9 linux-manual-4.9 linux-kbuild-4.9 linux-cpupower libcpupower1 libcpupower-dev linux-perf-4.9 libusbip-dev usbip hyperv-daemons linux-headers-4.9.0-1-grml-common linux-libc-dev linux-headers-4.9.0-1-grml-all linux-headers-4.9.0-1-grml-all-amd64 linux-image-4.9.0-1-grml-amd64 linux-headers-4.9.0-1-grml-amd64 linux-headers-4.9.0-1-grml-all-i386 linux-image-4.9.0-1-grml-686 linux-headers-4.9.0-1-grml-686 linux-image-4.9.0-1-grml-686-pae linux-headers-4.9.0-1-grml-686-pae linux-compiler-gcc-4.9-arm linux-compiler-gcc-4.9-s390 linux-compiler-gcc-4.9-x86
Architecture: source all amd64
Version: 4.9.17-1+grml.1
Distribution: grml-testing
Urgency: medium
Maintainer: Grml Team <team@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description:
 hyperv-daemons - Support daemons for Linux running on Hyper-V
 libcpupower-dev - CPU frequency and voltage scaling tools for Linux (development fi
 libcpupower1 - CPU frequency and voltage scaling tools for Linux (libraries)
 libusbip-dev - USB device sharing system over IP network (development files)
 linux-compiler-gcc-4.9-arm - Compiler for Linux on ARM (meta-package)
 linux-compiler-gcc-4.9-s390 - Compiler for Linux on IBM zSeries (meta-package)
 linux-compiler-gcc-4.9-x86 - Compiler for Linux on x86 (meta-package)
 linux-cpupower - CPU power management tools for Linux
 linux-doc-4.9 - Linux kernel specific documentation for version 4.9
 linux-headers-4.9.0-1-grml-686 - Header files for Linux 4.9.0-1-grml-686
 linux-headers-4.9.0-1-grml-686-pae - Header files for Linux 4.9.0-1-grml-686-pae
 linux-headers-4.9.0-1-grml-all - All header files for Linux 4.9 (meta-package)
 linux-headers-4.9.0-1-grml-all-amd64 - All header files for Linux 4.9 (meta-package)
 linux-headers-4.9.0-1-grml-all-i386 - All header files for Linux 4.9 (meta-package)
 linux-headers-4.9.0-1-grml-amd64 - Header files for Linux 4.9.0-1-grml-amd64
 linux-headers-4.9.0-1-grml-common - Common header files for Linux 4.9.0-1-grml
 linux-image-4.9.0-1-grml-686 - Linux 4.9 for older PCs
 linux-image-4.9.0-1-grml-686-pae - Linux 4.9 for modern PCs
 linux-image-4.9.0-1-grml-amd64 - Linux 4.9 for 64-bit PCs
 linux-kbuild-4.9 - Kbuild infrastructure for Linux 4.9
 linux-libc-dev - Linux support headers for userspace development
 linux-manual-4.9 - Linux kernel API manual pages for version 4.9
 linux-perf-4.9 - Performance analysis tools for Linux 4.9
 linux-source-4.9 - Linux kernel source for version 4.9 with Debian patches
 linux-support-4.9.0-1-grml - Support files for Linux 4.9
 usbip      - USB device sharing system over IP network
Changes:
 linux (4.9.17-1+grml.1) grml-testing; urgency=medium
 .
   * Grml build of 4.9.17 based on Debian's 4.9.13-1~bpo8+1
     as of git commit 21904084e46ced4 (tag debian/4.9.13-1_bpo8+1).
   * Fix flavour definitions and configurations, otherwise wrong
     kernel configs are being used [Closes: issue1328]
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Oh, that's clearly unwanted for the grml64 build, thanks for raising that!

This seems to have gotten worse.

The daily unstable grml64 build from 2017-03-09 features an x86_64 kernel
*without* SMP support. CONFIG_SMP is unset according to /proc/config.gz.

> It used to cause troubles in the past for 486/32bit flavour. Though
> with the switch from 486 to 586 within Debian's kernel (and Grml's
> following that) it *might* be possible to re-enable SMP support on
> the 32bit flavor as well.
>
80486 support is of course another issue :).
(I still have one.)

* Elmar Stellnberger wrote in grml's BTS on 20141118 / 16:10:

> Having booted into GRML on my Asus P2B-DS I had to notice that only one of two
> processors are recognized. It seems to be due to lacking SMP support not
> compiled into GRMLs i686 kernel:
> grml 3.13-1-grml-486 #1 Debian 3.13.6-1+grml.1 (2014-03-10) i686 GNU/Linux
> did not support the second processor while a similar kernel did:
> Linux mint 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:08:14 UTC i686 i686
> i686 GNU/Linux
> Note that it can be very hard to work with this machine if only one of two
> 800Mhz processors is supported while it runs sufficiently fast with two.

The lack of SMP support in the 32bit flavor is by intention.

> Would there be any disadvantage in supporting SMP for such machines?

It used to cause troubles in the past for 486/32bit flavour. Though
with the switch from 486 to 586 within Debian's kernel (and Grml's
following that) it *might* be possible to re-enable SMP support on
the 32bit flavor as well.

regards,
-mika-

Having booted into GRML on my Asus P2B-DS I had to notice that only one of two
processors are recognized. It seems to be due to lacking SMP support not
compiled into GRMLs i686 kernel:
grml 3.13-1-grml-486 #1 Debian 3.13.6-1+grml.1 (2014-03-10) i686 GNU/Linux
did not support the second processor while a similar kernel did:
Linux mint 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:08:14 UTC i686 i686
i686 GNU/Linux
Note that it can be very hard to work with this machine if only one of two
800Mhz processors is supported while it runs sufficiently fast with two.
Would there be any disadvantage in supporting SMP for such machines?