Custom Kernels/Optimized OS/make.conf .. detail questions..

[linuxhelp]

Hi@ALL

FreeBSD 9.1-AMD64:

I've tried to recompile some custom kernels to reduce unwanted parts
- Where do users find useful make.conf settings
- Must the cputype be set? I didn't find setting Phenom X6 on Internet "hammer"?
- How to speed up the recompile of the whole system?

Dump of make.conf:

WITHOUT_X11=yes
MAKEOPTS=-j7   # use 6 cores
BATCH=yes      # run batch
PERL_VERSION=5.12.4
MODULES_OVERRIDE=acpi  # shrink kernel
BUILD_OPTIMIZED=YES 
OPTIMIZED_CFLAGS=YES
CFLAGS=-O2 -pipe -fno-strict-aliasing # must this be set?
WITH_CPUFLAGS=YES #??
WITH_OPTIMIZED_CFLAGS=YES #??
WITHOUT_DEBUG=YES
BUILD_STATIC=YES #??
WITH_PKGNG=yes #pkgng use

Thanks.

 

[fonz]

Where do users find useful make.conf settings[red]?[/red]

These forums and the make.conf(5) manpage come to mind.

Must the cputype[red]CPU type[/red] be set? i[red]I[/red] didn't find [red]a[/red] setting Phenom X6 on Internet "hammer"??

If there is no specific value for your CPU, it can be set to a generic value, e.g. I686_CPU or something.

Howto[red]How to[/red] speed up recompile[red]recompilation of[/red] the whole system?

You can use MODULES_OVERRIDE to have only the modules you really need built. And there should be a parallelisation flag somewhere too, although I wouldn't know off the top of my head what it is. Also, switching to single user mode might help in some cases.

 

[kpa]

devel/ccache is about the only way to get real speed ups in my opinion.

 

[wblock@]

make.conf:

MAKEOPTS=-j7   # use 6 cores

I don't do that, it could interfere with the ports MAKE_JOBS setting. When building world and kernel, I use -j8 on the command line. Eight jobs was the fastest on both Core2 and i5 processors in my benchmarks.

BATCH=yes      # run batch

That takes away one of the best benefits of building from ports, the ability to set options.

MODULES_OVERRIDE=acpi  # shrink kernel

That will save a little space on disk, but does not really make the kernel smaller.

BUILD_OPTIMIZED=YES 
OPTIMIZED_CFLAGS=YES
CFLAGS=-O2 -pipe -fno-strict-aliasing # must this be set?
WITH_CPUFLAGS=YES #??
WITH_OPTIMIZED_CFLAGS=YES #??

No, don't do that. That does not improve performance, but it does reduce compatibility, and it does slow down ports that can actually benefit from custom CFLAGS they set themselves.

WITHOUT_DEBUG=YES
BUILD_STATIC=YES #??

The first, meh. The second... why?