Re: kern.hz=1000 causes random poweroff on laptop

On Sun, 2006-04-23 at 12:37 -0500, Lars Fredriksen wrote:
> Hi,
> I don't think this is overheating either because it will generally lock 
> up within a minute or so, but perhaps it is possible that some part gets 
> to hot in that time frame. If so it is not something acpi is monitoring 
> because it reports temperatures substantially lower than the PSV limit. 
> Below is what acpi reports at 100 hz and idle:
> 
> hw.acpi.thermal.tz0.temperature: 46.9C
> hw.acpi.thermal.tz0.active: -1
> hw.acpi.thermal.tz0.passive_cooling: 1
> hw.acpi.thermal.tz0.thermal_flags: 0
> hw.acpi.thermal.tz0._PSV: 79.9C
> hw.acpi.thermal.tz0._HOT: -1
> hw.acpi.thermal.tz0._CRT: 94.9C

> I can leave the machine at the boot prompt without any problems for a 
> long time (I know that does not put much stress on the machine :-)), but 
> within 30-60 seconds of getting to a single user shell prompt, it is 
> dead as a duck at hz=1000.
> 

That's.... interesting behavior. This sounds interrupt related, to me.
What happens if you boot it up, then don't touch anything?

> Is is possible that it is a power converter issue, where the higher 
> frequency requires enough current to make the converter start going 
> belly up?
> 

Doubtful. If the power screwed up, you probably couldn't get a dump.

> Also with older kernels, it seems they sometime fails in a similar 
> fashion (hz=100), when I have a cardbus card (not a pcmcia) active. In 
> these scenarios though, the machine has typically been running for hours 
> or days, so it might have been something completely different.
> 
> I have for a long time suspected that the deep irq chain for irq9, might 
> have had something to do with these types of problems. On this machine 
> you have :
> <cbb_intr>
> <fxp_intr>
> <uhci_intr>
> <nm_intr>
> <InterruptWrapper>
> <intpm_intr>
> 
> This list is is from a trace I did a couple of years ago, so the names 
> might be different, but the depth of the chain hasn't changed.
> 
> Lars
> 
> Sam Leffler wrote:
> > Dag-Erling Smørgrav wrote:
> >> Lars Fredriksen <lars_at_odin-corporation.com> writes:
> >>> I have a laptop sony z505rx, that if booted with kern.hz as 1000, 
> >>> will power off within a minute or two of booting.
> >>
> >> sounds like overheating.
> >
> > I've noticed on several of my laptops that they run way hotter with 
> > freebsd than other systems (linux, windows).  Most are newer models 
> > that have either acpi issues or lack speedstep support.  But I suspect 
> > there's something else going on in the basic system.  I find it hard 
> > to believe the clock rate is the cause of this extra work but haven't 
> > dug into it (I hoped judicious use of hwpmc would pinpoint what's 
> > going on).
> >
> >     Sam
> >
> > !DSPAM:444a7550956491607598332!
> >
> >
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