CURRENT Kernel makes the system run very very hot
Sam Leffler
sam at errno.com
Mon Dec 10 13:51:35 PST 2007
Poul-Henning Kamp wrote:
> In message <20071210201106.GB90158 at cons.org>, Martin Cracauer writes:
>
> I installed this on my laptop yesterday:
>
> FreeBSD critter.freebsd.dk 8.0-CURRENT FreeBSD 8.0-CURRENT
> #0: Sun Dec 9 10:41:25 UTC 2007
> root at critter.freebsd.dk:/usr/obj/freebsd/src/sys/C5 i386
>
> And it does indeed look like the idle threads do not HLT the cpu.
>
> Interestingly, powerd(8) does the right thing and throttles down
> the cpu clock even though the idle threads churn away.
>
> top -HS shows:
>
> PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
> 10 root 171 ki31 0K 16K CPU1 1 25.2H 100.00% {idle: cpu1}
> 10 root 171 ki31 0K 16K RUN 0 25.2H 95.36% {idle: cpu0}
> 928 phk 45 0 319M 68624K *Giant 0 42:46 0.98% Xorg
> 28654 phk 44 0 3540K 1552K CPU1 0 0:01 0.98% top
> 982 phk 44 0 6500K 3940K select 1 11:03 0.29% xterm
> 11 root -24 - 0K 112K WAIT 1 19:49 0.00% {swi6: task queu
>
This might also explain why I started to see buildworld overheat my t41
where previously I'd built world countless times w/o an issue. The only
good thing that came out of that was that I verified thermal shutdown
worked correctly and it uncovered a bug in acpi where a failed read
would cause acpi to fall over (still unfixed).
Sam
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