linux-kernel - CONFIG_X86_INTEL_PSTATE disables CPU frequency transition stats, many governors and other standard features

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-next>] [day] [month] [year] [list]

Message-ID: <475427035.74642.1367038733183.JavaMail.mail@webmail08>
Date:	Sat, 27 Apr 2013 04:58:53 +0000 (UTC)
From:	"Artem S. Tashkinov" <t.artem@...os.com>
To:	linux-kernel@...r.kernel.org
Cc:	dirk.j.brandewie@...el.com, rjw@...k.pl, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: CONFIG_X86_INTEL_PSTATE disables CPU frequency transition stats,
 many governors and other standard features

Hello,

Just wanted to let everyone know that CONFIG_X86_INTEL_PSTATE wreaks
havoc with the CPU frequency subsystem in the Linux kernel.

With this option enabled:

1) All governors except performance and powersave are gone, ondemand
userspace, conservative

2) scaling_cur_freq is gone, thus user space utilities monitoring the CPU
frequency have stopped working

3) CPU frequency transition stats are gone, there's no "stats" directory
anywhere

4) scaling_available_frequencies is gone, so I cannot set the desired constant
CPU frequency (the userspace governor is not available anyway)

Is this an intended behavior? I shrivel to think that's the case.

The bug report is filed here: https://bugzilla.kernel.org/show_bug.cgi?id=57141

Best regards,

Artem
--
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/