Re: Question with maxcpus= parameter.

[Zhenzhong Duan]

Thanks for your quick response, Raj.

It's OL6 compatible with rhel6.

zduan
å 2015/11/6 14:57, Raj, Ashok åé:
> Hi Zduan
>
> do you know which distribution it is? This isn't a kernel bug.
>
> if you look at dmesg you should see how many CPUs were booted. But the sysfs
> files are created and the usermode script is bringing every cpu online.
>
> Tony mentioned this to me couple weeks ago when i was fixing another bug
> in maxcpus. I think you can safely remove the script and it should be fine.
>
> Cheers,
> Ashok
>
>
> On Fri, Nov 06, 2015 at 01:24:16PM +0800, Zhenzhong Duan wrote:
> > Hi Maintainers,
> >
> > Recently we faced an cpu online issue with maxcpus= parameter.
> >
> > We want to have 4 cpus onlined at bootup, test 3.8.13-stable on an 72 cpus
> > env with maxcpus=4, I found more cpus than 4 are onlined.
> > It's the udev scripts make them onlined. But below script exist for a long
> > time.
> > ACTION=="add", KERNEL=="cpu[0-9]*", RUN+="/bin/bash -c 'echo 1 >
> > /sys/devices/system/cpu/%k/online'"
> >
> > maxcpu= parameter didn't take effect, so is this a kernel bug? Or that
> > script should be removed?
> >
> > Btw: 2.6.39 works fine, I checked udev log, seems CPU ADD event is only sent
> > for 4cpus.
> > Why the difference between 2.6.39 and 3.8.13?
> >
> > thanks
> > zduan

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