Messages in this thread | | | Date | Tue, 05 Aug 2008 20:31:19 -0700 | From | Max Krasnyansky <> | Subject | Re: 2.6.27rc1 cannot boot more than 8CPUs |
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Jeff Chua wrote: > I've a Dell R900 with 4 quad-core Xeon processors (total 16CPUs), but > can only managed to boot up with CONFIG_NR_CPUS=8. Setting > CONFIG_NR_CPUS=16 causes the kernel to hang while booting.
You could try booting CONFIG_NR_CPUS=16 with maxcpus=8 (kernel command line option).
If it boots you can then try bringing the rest of the cpus online manually echo 1 > /sys/devices/system/cpu/cpu8/online ... echo 1 > /sys/devices/system/cpu/cpu15/online
Might get a better OOPS/BUG_ON/etc report.
Max
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