linux-kernel - Re: [PATCH 3/8] SGI x86_64 UV: Limit the number of number of SRAT messages

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Date:	Mon, 26 Oct 2009 11:08:58 -0700
From:	Mike Travis <travis@....com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	David Rientjes <rientjes@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>, Mel Gorman <mel@....ul.ie>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/8] SGI x86_64 UV: Limit the number of number of SRAT
 messages


Andi Kleen wrote:
> Mike Travis <travis@....com> writes:
> 
>> Limit number of SRAT messages of the form:
>> [    0.000000] SRAT: PXM 0 -> APIC 0 -> Node 0
> 
> While I generally agree on the concept of limiting per CPU information
> (see other mail) I don't think removing this message by default 
> is a good idea. I regularly needed it for debugging some NUMA related
> problems and they still happen moderately often even today.
> 
> I think the right approach here, to limit output, would be to figure out
> a more compact output format, perhaps using a matrix in a table
> or simply printing multiple pair per line.
> 
> -Andi
> 

On our UV systems, this really is redundant information and adds noise
to the console printout.  If you need to examine it, dmesg will provide
it (or don't use the limit_console_output flag)?

I had thought of some reduction techniques to reduce console output, but
it didn't seem worth the complexity.  Perhaps I was wrong?

Thanks,
Mike

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