SMP on AS4100 not working ?

[Jay Estabrook]

On Tue, May 17, 2005 at 08:20:44PM +0200, alpha-linux at gmx.net wrote:
>
> i got some bad feelings about smp on as4100.
> 
> during boot i get this kernel messages:
> 
> May 16 16:57:24 localhost kernel: MCPCIA machine check: vector=0x660
> pc=0xfffffc00012c62f8 code=0x2030000
> May 16 16:57:24 localhost kernel: machine check type: unknown
> May 16 16:57:24 localhost kernel: pc = [<fffffc00012c62f8>]  ra =
> [<fffffc00012c62e4>]  ps = 0000    Not tainted
> May 16 16:57:24 localhost kernel: pc is at _spin_unlock_irq+0x2c/0x38,  ra
> is at _spin_unlock_irq+0x18/0x38
.....

I see them as well; in my very limited testing, they appear only a
couple of times during initial boot, and not once things settle down,
so I've attributed them to some bad behavior in PCI probing routines
that have been modified recently.

If they don't seem to happen once the system is up, it should be
possible to ignore them until something more drastic occurs, as we
in AlphaLinux land have done for years... ;-}

> when i do a top, i only see 1 cpu:
> 
> top - 20:16:01 up 34 min,  2 users,  load average: 0.00, 0.10, 0.22
> Tasks:  65 total,   1 running,  64 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.1% us,  0.2% sy,  0.0% ni, 99.7% id,  0.0% wa,  0.0% hi,  0.0% si
> Mem:   2051608k total,   779288k used,  1272320k free,    38336k buffers
> Swap:   907656k total,        0k used,   907656k free,   676840k cached

As mentioned, the default "top" setting is for only 1 CPU-related line to
be displayed. Do an "h" and see what option will allow more granularity;
I think that "1" will do what you want...

> cat /proc/cpuinfo:
> cpus detected           : 4
> cpus active             : 4
> cpu active mask         : 000000000000000f

These really are the critical fields that determine if SMP is really
operational.

 --Jay++

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Jay A Estabrook                            HPTC - LINUX support
Hewlett-Packard Company - ZKO2-3/N30       (603) 884-0301
110 Spit Brook Road, Nashua NH 03062       Jay.Estabrook at hp.com
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