Messages in this thread | | | Subject | Re: Question with maxcpus= parameter. | From | Zhenzhong Duan <> | Date | Mon, 9 Nov 2015 13:47:20 +0800 |
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Tried nr_cpus=4, works.
[root@rwssq01 ~]# cat /sys/devices/system/cpu/possible 0-3 [root@rwssq01 ~]# cat /sys/devices/system/cpu/present 0-3 [root@rwssq01 ~]# uname -a Linux rwssq01.us.oracle.com 3.8.13-44.1.1.el6uek.x86_64 #2 SMP Wed Sep 10 06:10:25 PDT 2014 x86_64 x86_64 x86_64 GNU/Linux
zduan 在 2015/11/7 0:14, Konrad Rzeszutek Wilk 写道: > 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. > Did you try 'nr_cpus' ? >> 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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