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

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Date:   Fri, 22 Jun 2018 00:49:36 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, sre@...nel.org, nekit1000@...il.com,
        mpartap@....net, merlijn@...zup.org
Subject: Re: v4.18-rc1 on droid 4: very bad CPU performance

* Tony Lindgren <tony@...mide.com> [180622 07:22]:
> * Pavel Machek <pavel@....cz> [180621 12:18]:
> > 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?
> 
> I've noticed firefox is super slow.. Git bisect time?

Hmm not happening for me at least on duovero and droid4,
I'm getting about 20s for v4.17 and v4.18-rc1.

Regards,

Tony