Re: Cannot load latest 2.6.32.10 kernel on AMD quad-core

[Gerry Reno <greno@verizon.net>]

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On 04/29/2010 11:11 AM, Mike Viau wrote:
> Thu, 29 Apr 2010 10:46:51 -0400 <greno@verizon.net> wrote:
>
>     >> I've been changing various settings trying to figure out what
>     is the
>     >> problem and today after a very long wait (> 5 min) I was able
>     to see a
>     >> login prompt. But things are not well. During the boot I now see:
>     >> XENBUS: Unable to read cpu state.
>     >> XENBUS: Unable to read cpu state.
>     >> XENBUS: Unable to read cpu state.
>     >> XENBUS: Unable to read cpu state.
>     >>
>
>     > I get these message on boot too (note there is not long delay to
>     get these messages but they do appear closer to the end of my boot
>     up sequence). FYI, it has not affected XEN for as far as I could see.
>
>     Mike, what processor are you running on?
>
>
>
> A fairly recent Intel(R) Core(TM) i7 CPU         860  @ 2.80GHz
>
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 30
> model name      : Intel(R) Core(TM) i7 CPU         860  @ 2.80GHz
> stepping        : 5
> cpu MHz         : 2800.132
> cache size      : 8192 KB
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 11
> wp              : yes
> flags           : fpu de tsc msr pae cx8 apic sep mtrr cmov pat 
> clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc 
> rep_good nonstop_tsc aperfmperf pni est ssse3 cx16 sse4_1 sse4_2 
> popcnt hypervisor lahf_lm ida
> bogomips        : 5600.26
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
>
>
>
Intel processors do not seem to have the same problem for some reason.  
I did see though a large number of "soft lockup" bugs reported for Lucid 
Lynx recently (2.6.32-21).

The problem I'm seeing is just with the latest pv_ops dom0 kernel on AMD 
hardware.  Before I tore down the previous Xen installation in order to 
load 4.0.0-rc8 I was running 2.6.31.6 and xen 3.4.1 which worked with 
the exception of the checksumming problem which turned out to be a 
blocker.  But now something has changed between 2.6.31.6 and 2.6.32.10 
that seriously affected AMD processor hardware with a "soft lockup" problem.

-Gerry



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