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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 4 Jul 2018 22:12:18 +0200
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
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

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@...uan:~$ 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

Download attachment "config.gz" of type "application/gzip" (29025 bytes)

Download attachment "signature.asc" of type "application/pgp-signature" (182 bytes)