From: Peter Zijlstra <peterz@infradead.org>
To: Beata Michalska <beata.michalska@arm.com>
Cc: Joel Fernandes <joel@joelfernandes.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Quentin Perret <qperret@google.com>,
LKML <linux-kernel@vger.kernel.org>,
Qais Yousef <qais.yousef@arm.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Viresh Kumar <viresh.kumar@linaro.org>
Subject: Re: iowait boost is broken
Date: Tue, 8 Jun 2021 19:46:54 +0200 [thread overview]
Message-ID: <YL+tDv/EL5ogf/0w@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210607191031.GA12489@e120325.cambridge.arm.com>
On Mon, Jun 07, 2021 at 08:10:32PM +0100, Beata Michalska wrote:
> So back to the expectations.
> The main problem, as I see it, is what do we actually want to achieve with
> the I/O boosting? Is it supposed to compensate the time lost while waiting
> for the I/O request to be completed or is is supposed to optimize the rate
> at which I/O requests are being made.
The latter, you want to increase the race of submission.
> Do we want to boost I/O bound tasks by
> default, no limits applied or should we care about balancing performance
> vs power ? And unless those expectations are clearly stated, we might not
> get too far with any changes, really.
You want to not increase power beyond what is needed to match the rate
of processing I suppose.
next prev parent reply other threads:[~2021-06-08 17:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 16:19 iowait boost is broken Joel Fernandes
2021-06-07 19:10 ` Beata Michalska
2021-06-08 9:26 ` Qais Yousef
2021-06-08 17:46 ` Peter Zijlstra [this message]
2021-06-09 9:50 ` Quentin Perret
2021-06-10 15:28 ` Qais Yousef
2021-06-10 13:33 ` Beata Michalska
2021-06-08 19:09 ` Joel Fernandes
2021-06-10 13:30 ` Beata Michalska
2021-06-10 18:52 ` Joel Fernandes
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