[cfarm-users] gcc67/68 back online, please test

[Pierre Muller]

Hi,

  I am able to log in and use gcc67 without problems,
everything seems to work fine.

  However, I am still unable to log into gcc68.
But this was already the case before the last down time
of that machine.

  Does anyone else have problems to log into gcc68?
Are there special restrictions concerning the acceptable
SSH key types?

Thanks for all your work!

Sincerely,

Pierre Muller

Le 05/09/2018 à 20:55, Laurent GUERBY via cfarm-users a écrit :
> Hi,
> 
> We just upgraded gcc67/68 to the latest BIOS/AGESA, added some 
> settings to BIOS and kernel (see below) and restored ssh access 
> to all accounts.
> 
> Please test to see if the ryzen machines are at last stable
> under cfarm usage patterns.
> 
> Note: we had to blacklist ccp kernel module on gcc68
> so no kvm there. We'll restore it when new kernel is available
> with the proper fix for gcc68 processor.
> 
> Sincerely,
> 
> Laurent
> 
> PS: here are the instructions we followed:
> https://utcc.utoronto.ca/~cks/space/blog/linux/RyzenApparentlyStable
> For a long time these magic kernel command line parameters and similar
> tricks were the only workarounds available, at least to me. However
> there had long been rumors of a magic AMD provided magic firmware
> option that could work around the problem, generally exposed to you and
> me in a BIOS setting called 'Power Supply Idle Control', which you
> allegedly wanted to set to 'Typical current idle'. This apparently
> became available starting with AGESA 1.0.0.2a, which various
> motherboard vendors rolled into their overall BIOS at very different
> times. For bonus fun, apparently not all BIOS vendors even expose these
> AMD firmware settings, although enthusiast motherboards usually do.
> 
> https://utcc.utoronto.ca/~cks/space/blog/linux/KernelRcuNocbsMeaning
> rcu_nocbs=0-N processor.max_cstate=1
> (where N is the number of CPUs you have minus one.)
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