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

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

Message-ID: <alpine.LNX.1.10.0806111552090.20733@fbirervta.pbzchgretzou.qr>
Date:	Wed, 11 Jun 2008 15:52:57 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	"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 Wednesday 2008-06-11 15:36, Arjan van de Ven wrote:
>> >> btw this is scary; the Mhz line in /proc/cpuinfo doesn't have much
>> >> meaning really, so applications using it and depending on it is a
>> >> rather big disaster ;-(
>> >> 
>> >> Does anyone know why jackd wants to use this?
>> 
>> It would be nice to have a /sys file where the CPU frequency is in,
>
>may I ask why? What would you do with it?

Off the top off the head, just for reporting to the user. Desklets and stuff.

>If it says 100Mhz, what would you conclude? That you have a slow cpu?
>Or that you have a really fast CPU that currently runs at a low
>frequency because you're mostly idle and are saving power?
>
>CPU frequency is...
>1) not something that is fixed; it changes all the time
>2) not a good indication for performance; remember the 3.4Ghz pentium4,
>a 2Ghz Core2Duo outperforms it
>3) something which the cpu itself barely honors (the clock stops during
>idle etc etc)
--
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/