Correct me if I'm wrong, but current_cstate should never be greater than
supported_max_cstates, right?
There are a lot of reports out there, of systems crashing, due to problems
with cstate, and generally people go into BIOS and disable cstates. Call it
a "workaround." But it would be nice if the actual problem were addressed.
You know. So systems could be stable without disabling things in BIOS. ;-)
I have a Dell R710 which is unstable running solaris 10u9. It crashes
approx once per week, but it varies dramatically. While digging around, I
noticed that the current_cstate is generally higher than
supported_max_cstates. That seems like a bad thing, and could possibly
explain the instability.
kstat | grep current_cstate ; kstat | grep supported_max_cstates
I was easily able to find the meaning of current_cstate, but didn't find the
meaning of supported_max_cstates, for the sake of verifying that it means
what I think it means.
I also have a Sun machine, which is stable. I checked, and it never has a
cstate higher than supported_max_cstates. So that makes 2 data points which
both support the idea that current_cstate greater than supported_max_cstates
would be an indicator of system instability.
Is this mailing list a good place to reach out to kernel developers, or
whoever would be appropriate?
Here's what I see on the unstable system:
kstat | grep current_cstate ; kstat | grep supported_max_cstates
current_cstate 0
current_cstate 0
current_cstate 0
current_cstate 1
current_cstate 3
current_cstate 3
current_cstate 0
current_cstate 3
current_cstate 3
current_cstate 3
current_cstate 3
current_cstate 1
current_cstate 3
current_cstate 3
current_cstate 3
current_cstate 3
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
supported_max_cstates 2
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