* CPU 1 refused to die!
@ 2006-05-23 21:58 Giuliano Pochini
2006-05-23 22:51 ` Nathan Lynch
0 siblings, 1 reply; 4+ messages in thread
From: Giuliano Pochini @ 2006-05-23 21:58 UTC (permalink / raw)
To: LinuxPPC-dev
I booted with maxcpus=1, then I enabled the 2nd cpu
with echo 1 > /sys/devices/system/cpu/cpu1/online
I can't disable it anymore. dmesg says "CPU 1 refused to die!".
/proc/cpuinfo and /proc/interrupts show one cpu only and the tasks run on
one cpu after the echo 0 > /sys/... , but since the command takes a couple
of seconds to complete I think it's not simply a bogus error message.
Dual G4 MDD
Linux Jay 2.6.16.16 #8 SMP Sat May 13 19:15:05 CEST 2006 ppc 7455,
altivec supported PowerMac3,6 GNU/Linux
--
Giuliano.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: CPU 1 refused to die!
2006-05-23 21:58 CPU 1 refused to die! Giuliano Pochini
@ 2006-05-23 22:51 ` Nathan Lynch
2006-05-25 12:46 ` Giuliano Pochini
0 siblings, 1 reply; 4+ messages in thread
From: Nathan Lynch @ 2006-05-23 22:51 UTC (permalink / raw)
To: Giuliano Pochini; +Cc: LinuxPPC-dev
Giuliano Pochini wrote:
>
> I booted with maxcpus=1, then I enabled the 2nd cpu
> with echo 1 > /sys/devices/system/cpu/cpu1/online
So onlining at runtime seems to work. Did you verify that tasks get
run on the 2nd cpu after you online it? Any other strange messages in
dmesg?
> I can't disable it anymore. dmesg says "CPU 1 refused to die!".
But offlining doesn't.
Can you online and offline cpus if you boot without maxcpus=1?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: CPU 1 refused to die!
2006-05-23 22:51 ` Nathan Lynch
@ 2006-05-25 12:46 ` Giuliano Pochini
2006-06-24 20:18 ` Giuliano Pochini
0 siblings, 1 reply; 4+ messages in thread
From: Giuliano Pochini @ 2006-05-25 12:46 UTC (permalink / raw)
To: Nathan Lynch; +Cc: LinuxPPC-dev
On 23-May-2006 Nathan Lynch wrote:
> Giuliano Pochini wrote:
>>
>> I booted with maxcpus=1, then I enabled the 2nd cpu
>> with echo 1 > /sys/devices/system/cpu/cpu1/online
>
> So onlining at runtime seems to work. Did you verify that tasks get
> run on the 2nd cpu after you online it?
Yes, I did, and the difference in speed is pretty obvious.
> Any other strange messages in dmesg?
Nothing unusual.
> Can you online and offline cpus if you boot without maxcpus=1?
It behaves exactly the same. I can't say exactly when it stopped
working. 2.6.14 worked fine.
--
Giuliano.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2006-06-24 20:19 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2006-05-23 21:58 CPU 1 refused to die! Giuliano Pochini
2006-05-23 22:51 ` Nathan Lynch
2006-05-25 12:46 ` Giuliano Pochini
2006-06-24 20:18 ` Giuliano Pochini
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