linux-kernel - RE: [RFT][PATCH v5 0/7] sched/cpuidle: Idle loop rework

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Date:   Sun, 18 Mar 2018 08:30:29 -0700
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'Rafael J. Wysocki'" <rjw@...ysocki.net>,
        "'Thomas Ilsche'" <thomas.ilsche@...dresden.de>
Cc:     "'Peter Zijlstra'" <peterz@...radead.org>,
        "'Linux PM'" <linux-pm@...r.kernel.org>,
        "'Frederic Weisbecker'" <fweisbec@...il.com>,
        "'Thomas Gleixner'" <tglx@...utronix.de>,
        "'Paul McKenney'" <paulmck@...ux.vnet.ibm.com>,
        "'Rik van Riel'" <riel@...riel.com>,
        "'Aubrey Li'" <aubrey.li@...ux.intel.com>,
        "'Mike Galbraith'" <mgalbraith@...e.de>,
        "'LKML'" <linux-kernel@...r.kernel.org>,
        "Doug Smythies" <dsmythies@...us.net>
Subject: RE: [RFT][PATCH v5 0/7] sched/cpuidle: Idle loop rework

On 2018.03.18 04:01 Rafael J. Wysocki wrote:

> Below is a drop-in v6 replacement for patch [4/7].
>
> With this new patch applied instead of the [4/7] the behavior should be much
> more in line with the v4 behavior, so please try it if you can and let me know
> if that really is the case on your systems.

Yes, the idle power is back down to V4 levels. (I did not do a new graph).

Some other data from this week (7 patch set + poll fix verses kernel 4.16-rc5):

pipe-test: The not cross core test is the most dramatic. Using CPU's 3 and 7,
or core 3, uses 6% less power and 18% performance improvement.

Graphs:
http://fast.smythies.com/pipe-test-one-core-power.png
http://fast.smythies.com/pipe-test-one-core-times.png

A couple of Phoronix tests (I didn't get very far yet):
himeno: 11% performance improvement; 14% less power.
compress-lzma: small performance improvement; small power improvement.
mafft: performance similar; small power improvement.

... Doug