Re: [uml-devel] SMP sworking in tt mode

[Blaisorblade <blaisorblade@yahoo.it>]

On Saturday 12 February 2005 00:31, Vincent Guffens wrote:
> hi everyone,
>
> I read on the UML kernel site that SMP might be broken, so I gave it a
> try with linux-2.4.24-um1 to see how it would look like. I only try it
> with tt mode.
>
> In fact, the only modification that has to be done to get it to compile
> is simply to add CONFIG_NR_CPUS in the config.in file (The very simple
> patch is below).
>
> And that was it, now I have a brand new 16 cpus machine, as shown below
> (with four processes running)
>
>   3:36pm  up 4 min,  4 users,  load average: 0.04, 0.02, 0.00
> 37 processes: 33 sleeping, 4 running, 0 zombie, 0 stopped
> CPU0 states: 14.3% user,  7.3% system,  0.0% nice, 77.2% idle
> CPU1 states: 15.3% user,  7.2% system,  0.0% nice, 76.3% idle
> CPU2 states:  0.1% user,  0.1% system,  0.0% nice, 99.3% idle
> CPU3 states: 18.1% user,  8.1% system,  0.0% nice, 73.1% idle
> CPU4 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU5 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU6 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU7 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU8 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU9 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU10 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU11 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU12 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU13 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU14 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> CPU15 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle
> Mem:    28936K av,   28340K used,     596K free,       0K shrd,      32K
> buff
> Swap:       0K av,       0K used,       0K free                   22580K
> cached
>
>    PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND
>    156 root      14   0   376  376   316 R    14.4  1.2   0:01 md5sum
>    155 root      11   0   376  376   316 R    12.6  1.2   0:01 md5sum
>    154 root      13   0   376  376   316 R    12.2  1.2   0:01 md5sum
>    153 root      10   0   920  920   728 R     0.1  3.1   0:00 top
>
>
>
> I also tried with 32 processors, rebooted many times and let it run a
> few hours. I had it hang and panic a few times but I think it was
> because a make clean must be done before recompiling with SMP enable.
>
> Also, all the interrupts seem to be handled by CPU0 (according to
> /proc/interrupt), even after changing the prof_cpu_mask in /proc.
>
> Is there something to do to make other processors handle interrupt ?
I don't know, but I read in the "25 Jul 2002" entry of 
http://user-mode-linux.sourceforge.net/diary.html that Jeff wanted to do what 
you see on purpose.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade




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