Messages in this thread | | | Date | Thu, 12 Nov 2009 14:10:35 -0800 | Subject | Re: [PATCH 1/7] x86: Limit the number of processor bootup messages | From | Yinghai Lu <> |
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On Thu, Nov 12, 2009 at 9:19 AM, Mike Travis <travis@sgi.com> wrote: > With a large number of processors in a system there is an excessive amount > of messages sent to the system console. It's estimated that with 4096 > processors in a system, and the console baudrate set to 56K, the startup > messages will take about 84 minutes to clear the serial port. > > This set of patches limits the number of repetitious messages which contain > no additional information. Much of this information is obtainable from the > /proc and /sysfs. Most of the messages are also sent to the kernel log > buffer as KERN_DEBUG messages so it can be used to examine more closely any > details specific to a processor. > > The list of message transformations.... > > For system_state == SYSTEM_BOOTING: > > [ 18.669304] Booting Node 0, Processors 1 2 3 4 5 6 7 Ok. > [ 19.321065] Booting Node 1, Processors 8 9 10 11 12 13 14 15 Ok. > [ 20.065325] Booting Node 2, Processors 16 17 18 19 20 21 22 23 Ok. > .. > [ 117.153053] Booting Node 63, Processors 1016 1017 1018 1019 1020 1021 1022 1023 Ok. > [ 117.952235] Brought up 1024 CPUs > > Timing shows that with NO bootup messages, it takes only slightly less time > so printing adds very little overhead: > > [ 18.670219] Booting all processors > [ 117.180248] Brought up 1024 CPUs > > For Processor Information printout, the specifics of CPU0 are printed and > then at the end of the bootup sequence, a summary is printed: > > [ 117.957682] Processor Information for CPUS: 0-191,208-223,256-271,... > [ 117.968034] Genuine Intel(R) CPU 0000 @ 2.13GHz stepping 04 > [ 117.977406] BogoMIPS: MIN 3989.01 (7978031) AVG 4266.62 (8533249) MAX 4537.51 (9075028) > [ 117.984496] Processor Information for CPUS: 192-207,240-255,272-287,... > [ 117.996032] Genuine Intel(R) CPU 0000 @ 2.13GHz stepping 03 > [ 118.001404] BogoMIPS: MIN 4021.49 (8042995) AVG 4265.91 (8531833) MAX 4479.79 (8959584) > [ 118.012373] Processor Information for CPUS: 224-239,736-751 > [ 118.020032] Genuine Intel(R) CPU 0000 @ 1.87GHz stepping 03 > [ 118.028033] BogoMIPS: MIN 3733.92 (7467855) AVG 3746.96 (7493933) MAX 3939.52 (7879056) > [ 118.036360] Processor Information for CPUS: 320-335,384-415,432-447,... > [ 118.044032] Intel(R) Xeon(R) CPU X7560 @ 2.27GHz stepping 05 > [ 118.053404] BogoMIPS: MIN 4244.65 (8489318) AVG 4532.45 (9064917) MAX 4666.80 (9333604) > [ 118.060644] Total of 1024 processors activated (4386353.46 BogoMIPS). > > > The following lines have been removed: > > CPU: Physical Processor ID: > CPU: Processor Core ID: > CPU %d/0x%x -> Node %d
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