AMD (Phenom II x6) Turbo-Core causes random hangs

[Emiel]

Don Rosa wrote:
> 
> When AMD TurboCore is enabled in the BIOS any version of FreeBSD I
> have tested (8.1R, 8.2-RC3, 3-4months old 9-Current, all AMD64) causes
> a hard hang (complete hardware freeze) that I am unable to debug.
> 
> 
> I haven't been able to exactly reproduce the hang, but usually the
> system freezes after about ~1-2hours of normal usage (eg, compiling
> some "light" ports) but I have also noticed that the freeze triggers a
> lot faster when playing something in mplayer. (Mplayer rarely lasts
> for more than ~40minutes of continuous playback of a simple
> low-definition movie).
> 
> The freeze is not ports-userland/X related, as it has happened to
> hang/freeze in a console pure-install environment by just compiling
> system/ports with no extra drivers loaded.
> 
> I have experimented with almost all (except TurboCore of course) BIOS
> settings with no good results.
> 
> FreeBSD-side I have also tried various things:
> 
> - Disabling/Enabling powerd
> - Disabling acpi_throttle
> - Disabling apic clock
> - Disabling cpufreq/hwpstate subsystems
> - Lowering HZ
> - Changing sysctl c-state settings
> - Changing timecounters
> 
> Of which nothing worked.
> 
> 
> Finally turning off TurboCore in the BIOS solves the problem
> completely. I have experienced zero freezes with Turbo=off (machine
> rock stable), and in sum ~60 freezes with Turbo=on (while I was trying
> various things to solve the problem).
> 
> Some extra notes:
> 
> (all amd64 versions)
> Windows7 - no hangs ever with Turbo=on whatever the load/usage
> Linux - no hangs ever with Turbo=on whatever the load/usage
> OpenBSD 4.8 MP, usage of only 2-3 days, mainly to build stuff, no
> hangs with Turbo=on.
> 
> 

Hiya Don Rosa,

Im having the exact same problem on my machine here, i've now changed the
Turbo to off as you stated, so far its running solid (only 3 hours uptime,
but thats more then i had the past week).

To anyone whom is more experienced in FreeBSD and the workings of this (im a
fairly new FreeBSD user), how to approach this now, im sure it can be
solved, however, without any way of debugging or working logging i suspect
this is not easy to reproduce for any developer.

I will update here when my system has been stable for longer so its clear
for everyone that this is the only working workaround.

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