From: tony@atomide•com (Tony Lindgren)
To: linux-arm-kernel@lists•infradead.org
Subject: v4.18-rc1 on droid 4: very bad CPU performance
Date: Mon, 25 Jun 2018 23:16:04 -0700 [thread overview]
Message-ID: <20180626061604.GK112168@atomide.com> (raw)
In-Reply-To: <20180625094949.GA17001@amd>
* Pavel Machek <pavel@ucw•cz> [180625 09:52]:
> Hi!
>
> > > > V4.18 is slower than it should be.
> > > >
> > > > user at devuan:~$ 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 at devuan:~$ 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.
>
> Something weird is going on here. My notes say it should be 12
> seconds.
>
> It is indeed 20 seconds for v4.17, but it is 12 seconds in v4.14.
>
> v4.14 is:
> # CONFIG_CPU_FREQ is not set
> CONFIG_CPU_IDLE=y
> # CONFIG_CPU_IDLE_GOV_LADDER is not set
> CONFIG_CPU_IDLE_GOV_MENU=y
> # CONFIG_ARM_CPUIDLE is not set
>
> In v4.18, I have:
>
> CONFIG_CPU_FREQ=y
> CONFIG_CPU_FREQ_GOV_ATTR_SET=y
> CONFIG_CPU_FREQ_GOV_COMMON=y
> CONFIG_CPU_FREQ_STAT=y
> CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
>
> CONFIG_CPU_IDLE=y
> CONFIG_CPU_IDLE_GOV_MENU=y
> CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED=y
I gave it a quick try here with v4.14 and it was 21 seconds
on 4430 duovero. But this was with omap2plus_defconfig.
Regards,
Tony
next prev parent reply other threads:[~2018-06-26 6:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-21 12:15 v4.18-rc1 on droid 4: very bad CPU performance Pavel Machek
2018-06-22 7:20 ` Tony Lindgren
2018-06-22 7:49 ` Tony Lindgren
2018-06-25 9:49 ` Pavel Machek
2018-06-26 6:16 ` Tony Lindgren [this message]
2018-06-27 13:26 ` Pavel Machek
2018-06-27 19:48 ` Pavel Machek
2018-06-27 20:58 ` Pavel Machek
2018-06-28 9:06 ` Tony Lindgren
2018-07-04 20:12 ` Pavel Machek
2018-07-04 20:22 ` Pavel Machek
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