linux-kernel - Re: [PATCH 1/5] x86: Limit the number of processor bootup messages

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Message-ID: <4B04324D.6050508@sgi.com>
Date:	Wed, 18 Nov 2009 09:43:41 -0800
From:	Mike Travis <travis@....com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland Dreier <rdreier@...co.com>,
	Randy Dunlap <rdunlap@...otime.net>, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Rientjes <rientjes@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Jack Steiner <steiner@....com>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] x86: Limit the number of processor bootup messages



Yinghai Lu wrote:
> On Tue, Nov 17, 2009 at 4:22 PM, Mike Travis <travis@....com> wrote:
>> When there are 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.   Some of the messages
>> are also sent to the kernel log buffer as KERN_DEBUG messages so
>> dmesg can be used to examine more closely any details specific to
>> a problem.
>>
>> The new cpu bootup sequence for system_state == SYSTEM_BOOTING:
>>
>> Booting Node   0, Processors  #1 #2 #3 #4 #5 #6 #7 Ok.
>> Booting Node   1, Processors  #8 #9 #10 #11 #12 #13 #14 #15 Ok.
>> ..
>> Booting Node   3, Processors  #56 #57 #58 #59 #60 #61 #62 #63 Ok.
>> Brought up 64 CPUs
> 
> how about
> Booting Node   0, Processors  #1/0x01 #2/0x02 #3....
> append apic id in hex after the numbering.?
> 
> YH

The APIC id's are already listed earlier in the log.  There are
some other APIC patches to deal with making the output clearer
as well as more/less verbose.
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