linux-kernel - Re: [PATCH] RAS: Add a tracepoint for reporting memory controller events

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Message-ID: <20120531201824.GD16998@aftab.osrc.amd.com>
Date:	Thu, 31 May 2012 22:18:24 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aristeu Rozanski <arozansk@...hat.com>,
	Doug Thompson <norsk5@...oo.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] RAS: Add a tracepoint for reporting memory controller
 events

On Thu, May 31, 2012 at 04:11:32PM -0400, Steven Rostedt wrote:
> Sure, but how noisy is EDAC? Does it actually fill up the ring
> buffers?

It could be very quiet (i.e., machine runs with no errors) and it could
have bursts where it reports a large number of errors back-to-back
depending on access patterns, DIMM health, temperature, sea level and at
least a bunch more factors.

So I can imagine buffers filling up suddenly and fast, and userspace
having hard time consuming them in a timely manner.

Every byte counts in such cases.


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Boris.

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