linux-kernel - Re: PROBLEM: no cpu MHz in /proc/cpuinfo on 2.6.25.4-rt6

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 for Android: free password hash cracker in your pocket

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

Date:	Wed, 11 Jun 2008 09:08:40 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	"Jan Engelhardt" <jengelh@...ozas.de>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	"solsTiCe d'Hiver" <solstice.dhiver@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: no cpu MHz in /proc/cpuinfo on 2.6.25.4-rt6

On Wed, Jun 11, 2008 at 6:36 AM, Arjan van de Ven <arjan@...radead.org> wrote:
> CPU frequency is...
> 1) not something that is fixed; it changes all the time

Not necessarily true of setups where jackd is running.

> 2) not a good indication for performance; remember the 3.4Ghz pentium4,
> a 2Ghz Core2Duo outperforms it

Your point only holds if jackd is somehow using this to compare
performance across different cpus. It's not.

> 3) something which the cpu itself barely honors (the clock stops during
> idle etc etc)

Again, that won't be happening when jackd is running.

> Userland apps that use "cpu frequency" seem to be buggy to me, at
> least I don't believe that they understand the complexities about what
> this means,

It doesn't appear you understand what jackd is and what lengths users
will go to to configure their systems for running it smoothly and
reliably.

> and I don't believe that the decisions they make based on
> this will be made correctly.

Please go read the jackd designs slides from the 2003 presentation on
the jack website [1]. The author has a clue, and is quite aware of how
computers work.

   [1] http://lad.linuxaudio.org/events/2003_zkm/slides/paul_davis-jack/title.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/