Messages in this thread | | | Date | Wed, 6 Aug 2008 11:15:30 +0800 | From | "Jeff Chua" <> | Subject | 2.6.27rc1 cannot boot more than 8CPUs |
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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.
Here's the dmesg with CONFIG_NR_CPUS=8 ...
CPU6: Intel(R) Xeon(R) CPU L7345 @ 1.86GHz stepping 0b checking TSC synchronization [CPU#0 -> CPU#6]: passed. CPU 7 irqstacks, hard=c0526000 soft=c051e000 Booting processor 7/26 ip 6000 Initializing CPU#7 Calibrating delay using timer specific routine.. 3723.85 BogoMIPS (lpj=7447700) CPU: L1 I cache: 32K, L1 D cache: 32K CPU: L2 cache: 4096K CPU: Physical Processor ID: 6 CPU: Processor Core ID: 2 x86 PAT enabled: cpu 7, old 0x7040600070406, new 0x7010600070106 CPU7: Intel(R) Xeon(R) CPU L7345 @ 1.86GHz stepping 0b checking TSC synchronization [CPU#0 -> CPU#7]: passed. Brought up 8 CPUs Total of 8 processors activated (29790.71 BogoMIPS). net_namespace: 596 bytes Booting paravirtualized kernel on bare hardware NET: Registered protocol family 16
Here's the dmesg with CONFIG_NR_CPUS=16 ... Booting processor 8/1 ip 6000 Initializing CPU#8 Calibrating delay using timer specific routine.. 3723.85 BogoMIPS (lpj=7447793) CPU: L1 I cache: 32K, L1 D cache: 32K CPU: L2 cache: 4096K CPU: Physical Processor ID: 0 CPU: Processor Core ID: 1 x86 PAT enabled: cpu 7, old 0x7040600070406, new 0x7010600070106 CPU8: Intel(R) Xeon(R) CPU L7345 @ 1.86GHz stepping 0b checking TSC synchronization [CPU#0 -> CPU#8]: passed. *** Hangs here ***
How can I debug this further? I'm using the latest linux git pull.
Thanks, Jeff.
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