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From: Steven Rostedt <rostedt@goodmis.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: Borislav Petkov <bp@alien8.de>,
	"Chen, Gong" <gong.chen@linux.intel.com>,
	"m.chehab@samsung.com" <m.chehab@samsung.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5/7 v6] trace, RAS: Add eMCA trace event interface
Date: Mon, 2 Jun 2014 12:57:48 -0400	[thread overview]
Message-ID: <20140602125748.7093ced8@gandalf.local.home> (raw)
In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F3282545B@ORSMSX114.amr.corp.intel.com>

On Mon, 2 Jun 2014 16:22:19 +0000
"Luck, Tony" <tony.luck@intel.com> wrote:

 
> To which I'll counter that the trace ring buffer can handle tracing of
> events like page faults and context switches (can't it?) that happen
> at a rate of thousands per second.  Our eMCA records will normally
> happen at a rate of X per month (where X may well be less than one).
> If there is a storm of errors - we disable CMCI interrupts and revert
> to polling.  We declare a "storm" as just 15 events in a second. If we
> switch to polling, then we won't poll faster than once per second.
> 
> So worst case is that we are seeing some steady flow of events that
> don't quite trigger the storm detector ... about 14 events per second.

Also matters how big you expect these events to be. If you get a
"christmas tree" set of flags, how big will that event grow with all
the descriptions attached?

The max event size after all headers is 4056 bytes. If you go over
that, the event is ignored.

-- Steve

  reply	other threads:[~2014-06-02 16:57 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-15  8:30 New eMCA trace event interface Chen, Gong
2014-05-15  8:30 ` [PATCH 1/7 v5] trace, RAS: Add basic RAS trace event Chen, Gong
2014-05-15  8:30 ` [PATCH 2/7 v3] trace, AER: Move trace into unified interface Chen, Gong
2014-05-21 10:19   ` Borislav Petkov
2014-05-22  0:03     ` Chen, Gong
2014-05-22 10:41       ` Borislav Petkov
2014-05-15  8:30 ` [PATCH 3/7 v4] CPER: Adjust code flow of some functions Chen, Gong
2014-05-21 11:05   ` Borislav Petkov
2014-05-21 23:51     ` Chen, Gong
2014-05-22 10:52       ` Borislav Petkov
2014-05-23  1:49         ` Chen, Gong
2014-05-23  9:37           ` Borislav Petkov
2014-05-23 10:11             ` Borislav Petkov
2014-05-26  1:59               ` Chen, Gong
2014-05-26 10:21                 ` Borislav Petkov
2014-05-26 10:42                   ` Chen, Gong
2014-05-26  2:07             ` Chen, Gong
2014-05-26 10:23               ` Borislav Petkov
2014-05-15  8:30 ` [PATCH 4/7 v2] RAS, debugfs: Add debugfs interface for RAS subsystem Chen, Gong
2014-05-15  8:30 ` [PATCH 5/7 v5] trace, RAS: Add eMCA trace event interface Chen, Gong
2014-05-15  8:30 ` [PATCH 6/7 v3] trace, eMCA: Add a knob to adjust where to save event log Chen, Gong
2014-05-21 11:06   ` Borislav Petkov
2014-05-21 23:46     ` Chen, Gong
2014-05-22 11:11       ` Borislav Petkov
2014-05-23  1:40         ` Chen, Gong
2014-05-28  3:27         ` [PATCH 6/7 v4] " Chen, Gong
2014-05-15  8:30 ` [PATCH 7/7] RAS, extlog: Adjust init flow Chen, Gong
2014-05-28  3:32 ` new trace output format Chen, Gong
2014-05-28  3:32   ` [PATCH 5/7 v6] trace, RAS: Add eMCA trace event interface Chen, Gong
2014-05-28 15:28     ` Steven Rostedt
2014-05-28 16:34       ` Borislav Petkov
2014-05-28 16:56         ` Steven Rostedt
2014-05-29  7:43           ` Chen, Gong
2014-05-29 10:35             ` Borislav Petkov
2014-05-29 13:12             ` Steven Rostedt
2014-05-30  2:56               ` Chen, Gong
2014-05-30  9:22           ` Chen, Gong
2014-05-30 10:07             ` Borislav Petkov
2014-05-30 21:16               ` Tony Luck
2014-05-30 21:26                 ` Borislav Petkov
2014-05-30 23:03               ` Luck, Tony
2014-05-30 23:03                 ` Luck, Tony
2014-05-31  1:07                 ` Steven Rostedt
2014-06-02 16:22                   ` Luck, Tony
2014-06-02 16:57                     ` Steven Rostedt [this message]
2014-06-03  8:36                       ` Chen, Gong
2014-06-03 14:35                         ` Steven Rostedt
2014-06-04 18:32                           ` Steven Rostedt
2014-06-06  6:51                           ` Chen, Gong
2014-06-06 15:21                             ` Steven Rostedt
2014-06-09  1:10                               ` Chen, Gong
2014-06-09 10:22                                 ` Borislav Petkov
2014-05-28 16:23   ` new trace output format Borislav Petkov

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