On 7 Dec 2011, Attila Kinali told this:
> I have two stability issues: The CPU runs at 60°C when the system
> is idle.
SIO Temp: +53.0°C (low = -55.0°C, high = +127.0°C)
(crit = +127.0°C)
(room temperature: 15C.)
> Configuration is a bare net5501-700 in the standard case, with
> a low power 2.5" sata harddisk mounted on top of it.
That extra heat would be the HDD, then. They really can spit out heat,
low power or not (it seems to be correlated mostly with age, I suspect
due to bearing wear).
> When using the
> CPU to its limit (like by using cpuburn), the temperature will rise
> to 80°C.
I see no increase in temperature *at all* under heavy CPU load. I find
this very surprising: 120 wakeups per second (from the timer interrupt
and the entropy key daemon) shouldn't be stopping the thing from going
to sleep and cooling down, should it? (Not that 53C really worries me.)
> Having any other component in there that generates some heat
> or having the case in a room that has very little draft will cause
> the system to crash from time to time.
>
> Adding a fan to the sysem solved the issue.
Running an HDD without a fan in the mix to give some airflow seems risky
to me, no matter the case.
> This has been tested and reproduced with Linux kernels 2.6.38.x, 2.6.39.1
> and 3.0.1 (vanilla, no patches).
FWIW, I've been using a Soekris net5501 for two and a half years now (no
HDD or wifi). Linux kernels from 2.6.30 up to 3.2rc. No crashes not
attributable to user error, not one. It's sufficiently reliable that I
just bought a second one in case lightning strikes the first one and
cuts me off from the Internet :)
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