Looks like I gotta learn to compile a kernel. somthing I've been
religiously avoiding because ...well, cuz I could! Now, I'm obsessed
with seeing ALL my boot info when I invoke dmesg as su. Apparently,
the kernal ring buffer is maxed at 16K and I need more buffer size qto

see ALL my boot info. I seem to recall I also need to enable
something in the kernel to see graphics in links. I'll hafta look it
up again. Anything else I should look out for in my spineless
endeavor?

Yes, be sure to add local version number so you can return to distro
kernel for the second and third attempts

On 2009-10-17, Grant <g_r_a_n_t_ at (no spam) bugsplatter.id.au> wrote:

Yes, be sure to add local version number so you can return to distro
kernel for the second and third attempts :)

Do you really need to do that?

I guess if you run make install you do,
but I don't do that; I copy the bzImage file made to /boot/my.own.name,
and modify lilo.conf by hand. The only real hitch is System.map, but
that's not essential for booting, so I usually leave it as-is till I
know my new kernel works, then back up the original and copy in my new
one.

I recently rebuilt my kernel to allow it to scale down the processor.
From what I can tell, the default Slackware kernel does not tune down
the CPUs if the system is idle. Now my CPUs run at 1GHz most of the
time instead of full-speed at 2.2GHz. I haven't had time to compute how
much I'm reducing my power usage, but last I checked, at full speed, I
was using about 9KWh in 24 hours, but at reduced speed it was down to
about 4KWh. I don't recall which kernel parameters control this, but if
you get powertop it'll tell you (or you can look at the kernel docs).

... I forget how ppl might manually install a custom kernel,

Curious as to why you needed to rebuild kernel to support scaling.
I have 12.2 and only needed to setup a startup script called by rc.local
to load kernel modules - modprobe acpi-cpufreq & modprobe
cpufreq_ondemandand setup /sys/devices/system/cpu/cpu0 and cpu1 with
ondemand

This setup is pretty well doucmented after a little Googling.

On 2009-10-18, geep <geepat at (no spam) boursomaildot.com> wrote:
Curious as to why you needed to rebuild kernel to support scaling.
I have 12.2 and only needed to setup a startup script called by rc.local
to load kernel modules - modprobe acpi-cpufreq & modprobe
cpufreq_ondemandand setup /sys/devices/system/cpu/cpu0 and cpu1 with
ondemand

Honestly? I just did what powertop recommended. Perhaps I needed to
rebuild in order to allow powertop to collect the stats it needed.

Has powertop been updated since 2006? Last time I ran that, it told me to
enable usb suspend, even though the servers never had usb enabled at all,
I think the way it gets its info is suspect.

"Keith Keller" <kkeller-usenet at (no spam) wombat.san-francisco.ca.us> wrote in
message news:eajpq6xhb.ln2 at (no spam) goaway.wombat.san-francisco.ca.us...
I recently rebuilt my kernel to allow it to scale down the processor.
From what I can tell, the default Slackware kernel does not tune down
the CPUs if the system is idle. Now my CPUs run at 1GHz most of the
time instead of full-speed at 2.2GHz. I haven't had time to compute
how much I'm reducing my power usage, but last I checked, at full
speed, I was using about 9KWh in 24 hours, but at reduced speed it was
down to about 4KWh. I don't recall which kernel parameters control
this, but if you get powertop it'll tell you (or you can look at the
kernel docs).

--keith

Hi Keith,
(Apologies for thread drift...)
Curious as to why you needed to rebuild kernel to support scaling. I
have 12.2 and only needed to setup a startup script called by rc.local
to load kernel modules - modprobe acpi-cpufreq & modprobe
cpufreq_ondemandand setup /sys/devices/system/cpu/cpu0 and cpu1 with
ondemand
This setup is pretty well doucmented after a little Googling.

Cheers,
Peter