[parisc-linux] Re: Kernel 2.4.17-32-smp problem

[Jeremy Drake]

On Mon, 25 Mar 2002, Thibaut VARENE wrote:

> We're running a 2.4.17-pa17 SMP for over 12 days now on our A500;
> The top also shows us a 50% idle.
> The slmon utility shows that only one processor is being used (CPU1),
> but the experience told us it wasn't true (see bellow).
> >
> > Your observation suggest something wrong with either process scheduling
> > or process accounting.
> >
> > And I hope CPU0 isn't completely idle, look at /proc/interrupts.
> > I know interrupt distribution works.
> We are running two instances of setiathome ;o) on this machine with this
> kernel,
> both units are completed in the same time, I mean that the box does two
> units in the time it needs to do one in non-SMP mode. Therefore I think
> that both processors are functioning properly ;o)
> We have noticed that the load average seems to reflect the real load on
> the machine: it goes up to 2.00 when 2 setis are running, even though
> only one seems to be "on processor" according to the top.

When I tried to run 2 seti's, one hung.  When I look at per-process stats,
they all have 0 time on cpu0.

>
> We suspect that something goes wrong with the proc.
> Here's our /proc/interrupts:
> [varenet@mkhppa3 ~]$ cat /proc/interrupts
>   IRQ      count         Region    ISR
>   64:  218592808    8402371       PA-CPU-00  timer
>   65:    7219789          0       PA-CPU-00  IPI
>   66:    8402371         30       PA-CPU-00  IO-SAPIC00-L0
>   67:          0     239155       PA-CPU-00  IO-SAPIC00-L1
>   68:          0       2284       PA-CPU-00  IO-SAPIC00-L2
>   69:         30          0       PA-CPU-00  IO-SAPIC00-L2
>   70:     239155          0       PA-CPU-00  IO-SAPIC00-L3
>   71:       2284          0       PA-CPU-00  IO-SAPIC00-L4
>   72:          0          0       PA-CPU-00  IO-SAPIC00-L5
> 128:    8402371          0      IO-SAPIC00  eth0
> 130:         30          0      IO-SAPIC00  sym53c8xx
> 131:     239155          0      IO-SAPIC00  sym53c8xx
> 132:       2284          0      IO-SAPIC00  serial
> >
> >
> Thibaut VARENE
> PA/Linux ESIEE Team
> http://www.esiee.fr/puffin
>
>
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