Further to my previous report..
I have just noticed that, where the host is running on the dual
"Quad-Core AMD Opteron(tm) Processor 2352" (family 16, model 2) the
kernels in the *guest* machines (usually 2.6.26) are reporting "WARNING:
This combination of AMDprocessors is not suitable for SMP." - presumably
this is why my SMP isn't stable!
The kernel in that host machine (2.6.26.2) does *not* report the messages.
However, where the host is a single "AMD Athlon(tm) 64 X2 Dual Core
Processor 4000+" (family 15, model 107) the guest kernels do not report
the WARNING above - but I've not actually run any SMP guest on that
host, so don't know if it would work or not.
The warning seems to be due to a processor capability test in
"arch/x86/kernel/smpboot.c" - "add_taint(TAINT_UNSAFE_SMP);"
Its not clear to me why one guess is failing this test and the other
passing, because both guests are seeing "QEMU Virtual CPU version
0.9.1", family 6, model 2 (according to "/proc/cpuinfo").
Although most kernels on the Athlon host are running 2.6.21 not 2.6.26
James
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