For those interested, I recompiled the 2.4.21-0.16mm-mdk kernel with pretty
aggresive athlon-xp optflags, and it works fine. These flags also work on
other kernels I have tried. The trick in making them take when compiling
kernels is putting them in the linux-2.4.21-0.16mm-mdk/arch/i386/Makefile, in
the following manner.
First, I installed the MDK multimedia kernel & kernel-source rpms in the usual
manner. Then I copied the resulting source directory placed in /usr/src to my
"kernels" directory in ~/home.
Then copy the .config file to another location, go to a console, cd to
linux-2.4.21-0.16mm-mdk and do make mrproper. Then go into the above mentioned
Makefile, and comment out the current MK7 flags, and add the new flags
stanza, like shown below.
---------------------------------------------------
#ifdef CONFIG_MK7
#CFLAGS += $(shell if $(CC) -march=athlon -S -o /dev/null -xc /dev/null
>/dev/null 2>&1; then echo "-march=athlon"; else echo "-march=i686
-malign-functions=4"; fi)
#endif
ifdef CONFIG_MK7
CFLAGS += -march=athlon-xp -falign-functions=16 -falign-labels=1
-falign-loops=16 -falign-jumps=16 -mfpmath=sse -maccumulate-outgoing-args
-fprefetch-loop-arrays
endif
The =16 values set things to corelate precisely with the athlon-xp's design
parameters, which I would think are pretty important. This is said to allow
the on-die cache to be fully utilized and filled with 16 byte segments.
----------------------------------------------------
Then do make xconfig, and import the config file you copied before, and do any
editing needed. (In my case, I removed some 3rd party stuff that caused
depmod errors for modules concerning ethernet cards etc. not found when
rebooting, but it does no harm.) Save the config file, edit the main extra
version Makefile (not the one you put flags in) like below:
VERSION = 2
PATCHLEVEL = 4
SUBLEVEL = 21
EXTRAVERSION = -0.16mmxp
Then do the usual:
make dep
make clean
make bzImage
make modules
su to root
make modules_install
You will get a warning in make modules (among a few other minor ones) as shown
here:
cc1: warning: -fprefetch-loop-arrays is not supported with -Os
This only occurs in one small section where -Os apparently takes over, and
does no harm AFAIK. -Os then releases, and -fprefetch-loop-arrays comes right
back. (Can anybody explain this?) As long as you get done with no actual
errors and compile bail outs, you are OK.
I don't do the usual make install, but manually copy bzImage and System.map to
/boot, adding the kernel name-version, like below.
[EMAIL PROTECTED] linux-2.4.21-0.16mm-mdk]# cp System.map
/boot/System.map-2.4.21-0.16mmxp
[EMAIL PROTECTED] linux-2.4.21-0.16mm-mdk]# cd
/home/wrc1944/kernels/linux-2.4.21-0.16mm-mdk/arch/i386/boot
[EMAIL PROTECTED] boot]# cp bzImage /boot/bzImage-2.4.21-0.16mmxp
Then edit lilo, adding the stanza for the new "xp optimized" mm kernel,
omitting the initrd line:
image=/boot/bzImage-2.4.21-0.16mmxp
label=2421mmXP
root=/dev/hda10
append="devfs=mount hdc=ide-scsi acpi=off quiet"
vga=788
read-only
Save, run lilo, and then reboot.
I don't think I left anything out.
wrc1944
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