linux-kernel - Re: [RT] [RFC] simple SMI detector

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Message-Id: <1232992272.19862.3.camel@londonpacket.bos.redhat.com>
Date:	Mon, 26 Jan 2009 12:51:12 -0500
From:	Jon Masters <jcm@...hat.com>
To:	Mike Kravetz <kravetz@...ibm.com>
Cc:	linux-rt-users@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	williams <williams@...hat.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
Subject: Re: [RT] [RFC] simple SMI detector

On Sun, 2009-01-25 at 14:52 -0800, Mike Kravetz wrote:

> Any reason why you could not do SMI detection in user level code running
> at the highest RT priority?

Yeah. I had some suggestions about that already...the problem with that
is that you can't know whether measured latencies are due to SMIs /or/
other kernel latencies - maybe there's a bug or other problem? I really
want to be able to say to vendors "nope, it's definitely your problem".

So I think what'll end up happening is a user process for ease of
deployment but something like smi_detector for advanced diagnostics. And
then I just hope others will write tools like the one IBM already has
that will turn off extraneous SMI generation :)

Jon.

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