linux-kernel - Re: cpufreq userspace governor does not reflect changes

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] [day] [month] [year] [list]

Message-ID: <8aa016e10611171148r14d066a2q96fb17b91846396c@mail.gmail.com>
Date:	Sat, 18 Nov 2006 01:18:19 +0530
From:	"Dhaval Giani" <dhaval.giani@...il.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	davej@...emonkey.org.uk, linux-kernel@...r.kernel.org
Subject: Re: cpufreq userspace governor does not reflect changes

Hey,

On 11/18/06, Pallipadi, Venkatesh <venkatesh.pallipadi@...el.com> wrote:
>
> /sys/devices/....../cpuX/cpufreq/scaling_cur_freq
> Gives you the information about last frequency that Linux tried to set
> on this CPU
>
> /sys/devices/....../cpuX/cpufreq/cpuinfo_cur_freq
> (When supported) Gives you the information about actual frequency that
> the CPU is running at.
>
> Zero frequency value below is certainly a bug in the driver. What is the
> kernel you are using?

Ooops! sorry missed that one. Its the 2.6.19-rc5-mm2. Its having the
same .config which i posted on the bugzilla. Do you want the acpidump
again?

> On the particular CPU you have here, all cores in a package indeed share
> the frequency. But, it does not really show up in affected_cpus as OS is
> not coordinating the shared-ness of P-state across cores. That means, OS
> programs each core individually based on CPU utilization and hardware
> will pick the highest frequency among the two and run both cores at that
> frequency.
>

Hold on, so let me get it right. When i do an echo 1596000 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed, the cpu cores
will still be running at 1.86 Ghz since the other core is at that
frequency? In this situation how do I then change the frequency?

Thanks
Dhaval
-
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/