Date: Wed, 18 Nov 2015 11:35:41 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>, Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        John Stultz <john.stultz@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Len Brown <len.brown@intel.com>,
        Rafael Wysocki <rafael.j.wysocki@intel.com>,
        Eduardo Valentin <edubezval@gmail.com>, Paul Turner <pjt@google.com>
Subject: Re: [PATCH 3/4] sched: introduce synchronized idle injection
Message-ID: <20151118103541.GE3816@twins.programming.kicks-ass.net>
References: <1447444387-23525-1-git-send-email-jacob.jun.pan@linux.intel.com>
 <1447444387-23525-4-git-send-email-jacob.jun.pan@linux.intel.com>
 <20151118083622.GA25217@gmail.com>
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On Wed, Nov 18, 2015 at 09:36:22AM +0100, Ingo Molnar wrote:
> What will such throttling do to latencies, as observed by user-space tasks? What's 
> the typical expected frequency of the throttling frequency that you are targeting?

The default has 5ms (iirc) of forced idle, so depending on what you do,
noticeable to outright painful.
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