Bug#412194:
Hello again,
i hope, i may take the liberty of presenting you a working solution.
So the late grave bug (sorry for this again!) hopefully will be
closed quite soon.
a) testing info
Running 2.6.18-4-k7 without "nosmp" i looked what clocksources are
actually available and which one is used:
www:~# cat /sys/devices/system/clocksource/clocksource0/*
jiffies tsc pit
pit
Well, although "jiffies" and "tsc" were present and even of higher
position and value, 2.6.18-4-k7 still chose "pit" as clocksource.
Interestingly acpi_pm was neither shown nor detected (dmesg log):
#ACPI: Unable to locate RSDP
#...
#ACPI: Interpreter disabled.
#Linux Plug and Play Support v0.97 (c) Adam Belay
#pnp: PnP ACPI: disabled
As i do not use "acpi=off" or any similar it is hard to guess, why
exactly 2.6.18-4-k7 fails to detect the ACPI Root System Description
Pointer. Useless to say, why my previous "clocksource=acpi_pm" was
pretty braindead. :D
b) possible solution (at least over here :P)
No problem, life is great without ACPI, as far as i currently
believe :P, so let's slap 2.6.18-4-k7 for serving us "pit" and not
using the Time Step Clock ("tsc") we can enjoy since the very first
pentium cpu and that 2.6.18-4-k7 has already detected above:
www:~# echo "tsc" > /sys/devices/system/clocksource/clocksource0/
current_clocksource
www:~# cat /sys/devices/system/clocksource/clocksource0/*
jiffies tsc pit
tsc
www:~#
Now, once "tsc" is on command everything runs smooth again. No
freezes. Just smp heaven as it used to be. :)
I decided to put "clocksource=tsc" as a boot option for 2.6.18-4-k7.
Rebooted. And my 2.6.18-4-k7 system is up for hours without freezes
again.
@ Figaro <ynegorp_at_charter_dot_net>: Please test this, as it is
important to know, whether this solution is usefull for your system
also. Please let us know asap, so Steve can close this grave thingy,
disable or downgrade "pit"-support in favour of "tsc" and heat up the
autobuilders. Thank you! 8)
@ Steve: As i don't exactly know, whether some user might truly need
"pit" on k7-platform as clocksource, i leave the above described
decision up to you..:P (shame on me!)
Thank you all very much!
Alexander Schories
Tuebingen, Germany
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