linux-kernel - Re: [RFC PATCH v1 00/11] Create fast idle path for short idle periods

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Message-ID: <20170710084647.zs6wkl3fumszd33g@hirez.programming.kicks-ass.net>
Date:   Mon, 10 Jul 2017 10:46:47 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Aubrey Li <aubrey.li@...el.com>
Cc:     tglx@...utronix.de, len.brown@...el.com, rjw@...ysocki.net,
        ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
        arjan@...ux.intel.com, paulmck@...ux.vnet.ibm.com,
        yang.zhang.wz@...il.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, Aubrey Li <aubrey.li@...ux.intel.com>
Subject: Re: [RFC PATCH v1 00/11] Create fast idle path for short idle periods

On Mon, Jul 10, 2017 at 09:38:30AM +0800, Aubrey Li wrote:
> We measured 3%~5% improvemnt in disk IO workload, and 8%~20% improvement in
> network workload. 

Argh, what a mess :/

So how much of the gain is simply due to skipping NOHZ? Mike used to
carry a patch that would throttle NOHZ. And that is a _far_ smaller and
simpler patch to do.