linux-kernel - v4.18-rc1 on droid 4: very bad CPU performance

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Message-ID: <20180621121542.GA4836@amd>
Date:   Thu, 21 Jun 2018 14:15:42 +0200
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, sre@...nel.org,
        nekit1000@...il.com, mpartap@....net, merlijn@...zup.org
Subject: v4.18-rc1 on droid 4: very bad CPU performance

Hi!

V4.18 is slower than it should be.

user@...uan:~$ time cat /dev/urandom | head -c 10000000 |  bzip2 -9 -
| wc -c
10044291
52.73user 2.40system 61.53 (1m1.534s) elapsed 89.60%CPU
user@...uan:~$ uname -a
Linux devuan 4.18.0-rc1-87964-gfa19934-dirty #743 SMP Sun Jun 17
19:26:37 CEST 2018 armv7l GNU/Linux

That bzip should take 12 seconds, not minute.

Any ideas? Do you see it, too?

Best regards,

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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