gregoa's blog
random musings about computers, life, and everything
random musings about computers, life, and everything
2008-02-11 23:36:20 +0100
fun with 2.6.24, part II
after my laptop
I tried to get 2.6.24 running on my desktop machine; several attempts
(Debian kernels, self-compiled ones with different options) all led to the
same results: a machine that feels rather unresponsive & where music
has sporadic dropouts.
some searching on the intarweb showed that the new CFS scheduler
(cf. Documentation/sched-design-CFS.txt) (at least the
enabled-by-default CONFIG_FAIR_USER_SCHED flavour) might have latency
problems, in itself or in combination with the ondemand CPU
frequency scaling governor or with nice'd processes; after turning
off all CONFIG_FAIR_* options in .config, recompiling
& rebooting the machine seems to behave normally.
maybe I'm missing some great new features but actually I prefer a working
desktop computer :)
update 1: approximately half an hour after the original blog entry I
had my first "ion sorbet", i.e. a half-frozen ion3 (the
applications are still running, I can switch to a tty but I cannot
change/close/whatever ion3's frames). at the moment I have no idea what's
going (wr)on(g) here ...
update 2: two more "ion sorbets" today yet; let's see if
a new kernel (CONFIG_FAIR_USER_SCHED seems to be fixed in 2.6.24.1)
& a new ion3 version help.
update 3: still the same problems (& inbetween some glitches with
switching from X to a tty and back; I hope I solved them with some kernel
config options); ATM I suspect ion3 to be the culprit; when it
hangs it eats almost all the CPU, & strace'ing the pid gives only
SIGALRM messages.
update 4: maybe I fixed the problem; by changing
from ion3's deprecated statusbar_external.lua to the newer
statusd_exec.lua (I just wanted to get rid of the error when
starting ion3 ...).
update 5: & after compiling a kernel without PREEMPT
ion3-statusd doesn't get stuck at using all my cpu every once in a
while. or after removing some duplicated statusd_*.lua scripts. who
knows.
update 6: nope, ion3-statusd is still hogging the cpu.
argl.
update 7: I guess it's statusbar_external.lua's fault, as it
happens on my other machine too.
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