System extremely slow under light load
freebsd at chillt.de
Sun Apr 24 17:27:34 UTC 2011
> did you test the caches? I've seen such a behavior when cpu cache was
The Dell BIOS setup is very minimalistic and would not even allow me to
turn off caches. So unless the FreeBSD boot loader somehow turned them
off, the caches should be active. Is there some tool I can use to verify
my caches are active?
> and it can be thermal throttle in case of bad contact between
> cpu and heatsink. try to reapply thermal compound
The CPU temperature is about 60°C-70°C when idle, 80°-90°C under light
load and exceeds 90°C under heavy load. All of these readings are
obtained from sysctl dev.cpu as ACPI always reports a temperature of
0°C. If I fix the DSDT to correctly report temperatures, a medium to
heavy load forces an emergency shutdown. To prevent this, I am running
with the original broken DSDT and the CPU throttled from 1.8GHz to
1.3GHz where it never exceeds 90°C.
Yes, the CPU is very warm. But it does not appear to be critically hot.
The ACPI critical threshold is 95°C. It seems that this model (Dell
Studio 15) always runs that hot. I have had several visits from a Dell
technician who changed everything from heat pipe to complete
motherboard. The temperatures never changed. Dell finally exchanged the
entire laptop for a slightly newer model but the temperatures remained
as they were. So reapplying thermal grease or even swapping components
does not seem to change anything. Again, a tool would be useful that can
tell me whether the CPU is throttling itself. Does such a thing exist?
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