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List: user-mode-linux-devel
Subject: Re: [uml-devel] SMP sworking in tt mode
From: Blaisorblade <blaisorblade () yahoo ! it>
Date: 2005-02-11 23:38:17
Message-ID: 200502120038.17642.blaisorblade () yahoo ! it
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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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