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From: Pavel Machek <pavel@ucw.cz>
To: Tony Lindgren <tony@atomide.com>
Cc: mpartap@gmx.net, merlijn@wizzup.org,
	kernel list <linux-kernel@vger.kernel.org>,
	sre@kernel.org, nekit1000@gmail.com, linux-omap@vger.kernel.org,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: v4.18-rc1 on droid 4: very bad CPU performance
Date: Wed, 4 Jul 2018 22:12:18 +0200	[thread overview]
Message-ID: <20180704201218.GC13932@amd> (raw)
In-Reply-To: <20180628090655.GL112168@atomide.com>


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Hi!

> > I was about to add "facepalm" emoji here, as disabling l2 cache is
> > major mistake. OTOH if you also see 20 seconds, then either there is
> > another problem, or you need to enable l2 cache, too (and I don't have
> > to feel too bad for misconfiguring it).
> 
> OK. I checked and duovero runs only at 600MHz. I can only
> get down to 19 seconds with omap2plus_defconfig if I disable
> CONFIG_CPU_FREQ so the max speed is maintained from bootloader.
> Otherwise it runs at most at 1GHz, I think any higher speeds
> need smartreflex and voltage scaling working which we don't
> have in the mainline kernel. Not sure what happens with higher
> speeds with mainline kernel or if they are unsafe in the long
> run.
> 
> Anyways, care to post your .config somewhere so I can see what
> the numbers are for me with it?

I'm attaching config I'm using for v4.18. In current boot, bzip2 takes
16 seconds.

user@devuan:~$ time cat /dev/urandom | head -c 10000000 |  sudo nice
-n -19 bzip2 -9 - | wc -c
10044705
15.68user 0.53system 15.93 (0m15.931s) elapsed 101.82%CPU

I guess I should go back to v4.17 to get 12 seconds..?!

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

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_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: pavel@ucw.cz (Pavel Machek)
To: linux-arm-kernel@lists.infradead.org
Subject: v4.18-rc1 on droid 4: very bad CPU performance
Date: Wed, 4 Jul 2018 22:12:18 +0200	[thread overview]
Message-ID: <20180704201218.GC13932@amd> (raw)
In-Reply-To: <20180628090655.GL112168@atomide.com>

Hi!

> > I was about to add "facepalm" emoji here, as disabling l2 cache is
> > major mistake. OTOH if you also see 20 seconds, then either there is
> > another problem, or you need to enable l2 cache, too (and I don't have
> > to feel too bad for misconfiguring it).
> 
> OK. I checked and duovero runs only at 600MHz. I can only
> get down to 19 seconds with omap2plus_defconfig if I disable
> CONFIG_CPU_FREQ so the max speed is maintained from bootloader.
> Otherwise it runs at most at 1GHz, I think any higher speeds
> need smartreflex and voltage scaling working which we don't
> have in the mainline kernel. Not sure what happens with higher
> speeds with mainline kernel or if they are unsafe in the long
> run.
> 
> Anyways, care to post your .config somewhere so I can see what
> the numbers are for me with it?

I'm attaching config I'm using for v4.18. In current boot, bzip2 takes
16 seconds.

user at devuan:~$ time cat /dev/urandom | head -c 10000000 |  sudo nice
-n -19 bzip2 -9 - | wc -c
10044705
15.68user 0.53system 15.93 (0m15.931s) elapsed 101.82%CPU

I guess I should go back to v4.17 to get 12 seconds..?!

Confused,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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WARNING: multiple messages have this Message-ID (diff)
From: Pavel Machek <pavel@ucw.cz>
To: Tony Lindgren <tony@atomide.com>
Cc: kernel list <linux-kernel@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	linux-omap@vger.kernel.org, sre@kernel.org, nekit1000@gmail.com,
	mpartap@gmx.net, merlijn@wizzup.org
Subject: Re: v4.18-rc1 on droid 4: very bad CPU performance
Date: Wed, 4 Jul 2018 22:12:18 +0200	[thread overview]
Message-ID: <20180704201218.GC13932@amd> (raw)
In-Reply-To: <20180628090655.GL112168@atomide.com>


[-- Attachment #1.1: Type: text/plain, Size: 1323 bytes --]

Hi!

> > I was about to add "facepalm" emoji here, as disabling l2 cache is
> > major mistake. OTOH if you also see 20 seconds, then either there is
> > another problem, or you need to enable l2 cache, too (and I don't have
> > to feel too bad for misconfiguring it).
> 
> OK. I checked and duovero runs only at 600MHz. I can only
> get down to 19 seconds with omap2plus_defconfig if I disable
> CONFIG_CPU_FREQ so the max speed is maintained from bootloader.
> Otherwise it runs at most at 1GHz, I think any higher speeds
> need smartreflex and voltage scaling working which we don't
> have in the mainline kernel. Not sure what happens with higher
> speeds with mainline kernel or if they are unsafe in the long
> run.
> 
> Anyways, care to post your .config somewhere so I can see what
> the numbers are for me with it?

I'm attaching config I'm using for v4.18. In current boot, bzip2 takes
16 seconds.

user@devuan:~$ time cat /dev/urandom | head -c 10000000 |  sudo nice
-n -19 bzip2 -9 - | wc -c
10044705
15.68user 0.53system 15.93 (0m15.931s) elapsed 101.82%CPU

I guess I should go back to v4.17 to get 12 seconds..?!

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

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  reply	other threads:[~2018-07-04 20:12 UTC|newest]

Thread overview: 23+ 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
2018-06-21 12:15 ` Pavel Machek
2018-06-22  7:20 ` Tony Lindgren
2018-06-22  7:20   ` Tony Lindgren
2018-06-22  7:49   ` Tony Lindgren
2018-06-22  7:49     ` Tony Lindgren
2018-06-25  9:49     ` Pavel Machek
2018-06-25  9:49       ` Pavel Machek
2018-06-26  6:16       ` Tony Lindgren
2018-06-26  6:16         ` Tony Lindgren
2018-06-27 13:26         ` Pavel Machek
2018-06-27 13:26           ` Pavel Machek
2018-06-27 19:48         ` Pavel Machek
2018-06-27 19:48           ` Pavel Machek
2018-06-27 20:58     ` Pavel Machek
2018-06-27 20:58       ` Pavel Machek
2018-06-28  9:06       ` Tony Lindgren
2018-06-28  9:06         ` Tony Lindgren
2018-07-04 20:12         ` Pavel Machek [this message]
2018-07-04 20:12           ` Pavel Machek
2018-07-04 20:12           ` Pavel Machek
2018-07-04 20:22         ` Pavel Machek
2018-07-04 20:22           ` Pavel Machek

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