linux-kernel - Re: runaway latency detection

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Message-ID: <072e2e64-2e9f-eb2b-eca2-00d8aa62974a@gmail.com>
Date:   Sat, 20 Aug 2016 20:54:23 +0300
From:   Nikolay Borisov <n.borisov.lkml@...il.com>
To:     "T. Smith" <tlsmith3777@...il.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Jon Masters <jcm@...hat.com>, Carsten Emde <C.Emde@...dl.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Clark Williams <williams@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Wagner <wagi@...om.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: runaway latency detection



On 20.08.2016 20:03, T. Smith wrote:
> The goal is to isolate causes of indeterminism when using the PREEMPT_RT kernel configuration with full preemption and to characterize latency and jitter using ftrace, any recommendations?

What hardware is it ? If it's x86 it's entirely possible you are seeing
SMI. Perhaps you should look into disabling those if you are on x86?