linux-kernel - Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting

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Message-ID: <20200805153120.GU2674@hirez.programming.kicks-ass.net>
Date:   Wed, 5 Aug 2020 17:31:20 +0200
From:   peterz@...radead.org
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Vladimir Oltean <olteanv@...il.com>,
        Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>,
        Alison Wang <alison.wang@....com>, catalin.marinas@....com,
        will@...nel.org, paulmck@...nel.org, mw@...ihalf.com,
        leoyang.li@....com, vladimir.oltean@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level
 IRQ time accounting

On Wed, Aug 05, 2020 at 02:56:49PM +0100, Valentin Schneider wrote:

> I've been tempted to say the test case is a bit bogus, but am not familiar
> enough with the RT throttling details to stand that ground. That said, from
> both looking at the execution and the stress-ng source code, it seems to
> unconditionally spawn 32 FIFO-50 tasks (there's even an option to make
> these FIFO-99!!!), which is quite a crowd on monoCPU systems.

Oh, so it's a case of: we do stupid without tuning and the system falls
over. I can live with that.