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[184.147.143.99]) by smtp.gmail.com with ESMTPSA id k10sm7748929qkk.124.2021.10.04.05.54.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Oct 2021 05:54:37 -0700 (PDT) Date: Mon, 4 Oct 2021 08:54:36 -0400 (EDT) From: John Kacur To: Jack Winch cc: Punit Agrawal , Pierre FICHEUX , Sebastian Andrzej Siewior , Clark Williams , linux-rt-users , Thomas Gleixner Subject: Re: Strange problem with PREEMPT_RT In-Reply-To: Message-ID: References: <87y27e53a2.fsf@stealth> <20210930132319.eixnv6rb66ui6x6j@linutronix.de> <20210930135145.mdlzzwp64yykixhx@linutronix.de> <871r554opi.fsf@stealth> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On Sun, 3 Oct 2021, Jack Winch wrote: > Punit Agrawal writes: > > > > If I remove this default we're going to get a slew of reports from people > > > using cyclictest wondering why they aren't getting good realtime > > > performance. > > > > Perhaps, this is a change best done with a major version bump. Not that > > it'll stop users queries completely but hopefully more people will pay > > attention to the changelog. > > Regrettably, I know quite a few RT Linux users who are neither party > to this mailing list (due to company IT policy), nor do they pay > attention to the changelog. Even less read the source code of the > rt-tests suite of tools. > > Regardless of these sorrowful facts, as this is such a fundamental > matter, perhaps it would be useful to highlight this behaviour of > cyclictest in the tool's documentation - specifically the program's > help output, manual page, and related content on the RT Linux wiki. I > see additional information going into the first two forms of > documentation as a required step. However, I believe that adding > information on this behaviour to the relevant pages of the RT Linux > wiki would also be greatly beneficial. This is because many > developers who are new to RT Linux development, in my experience, tend > to make use of the wiki to 'orientate' themselves when first starting > out, etc, and the omission of information regarding this behaviour > could lead to wrong assessments and conclusions being made when using > this tool. > > Jack > Don't worry, I try to keep the help and man pages up-to-date so you don't need to read change logs. If you see any problems with help / man pages either report that to the list and cc me, or send me a patch. Thanks John Kacur