From: Kristen Carlson Accardi <kristen@linux.intel.com>
To: Ethan Zhao <ethan.zhao@oracle.com>
Cc: dirk.j.brandewie@intel.com, viresh.kumar@linaro.org,
rjw@rjwysocki.net, corbet@lwn.net, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
ethan.kernel@gmail.com, joe.jin@oracle.com,
brian.maly@oracle.com
Subject: Re: [PATCH 2/2 V6] intel_pstate: add kernel parameter to force loading on Sun X86 servers.
Date: Tue, 2 Dec 2014 10:24:02 -0800 [thread overview]
Message-ID: <20141202102402.09ea6017@kcaccard-desk.amr.corp.intel.com> (raw)
In-Reply-To: <1417145777-21897-4-git-send-email-ethan.zhao@oracle.com>
On Fri, 28 Nov 2014 12:36:17 +0900
Ethan Zhao <ethan.zhao@oracle.com> wrote:
> To force loading on Oracle Sun X86 servers, provide one kernel command line
> parameter
>
> intel_pstate = ora_force
>
> For those who be aware of the risk of no power capping capabily working and
> try to get better performance with this driver.
So, is this something you'd expect users to use on production systems,
or is it just for debug?
Thanks,
Kristen
>
> Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
> ---
> v2: change to hardware vendor specific naming parameter.
> v4: refine code and doc.
> v5&v6: fix a typo in doc.
>
> Documentation/kernel-parameters.txt | 5 +++++
> drivers/cpufreq/intel_pstate.c | 6 +++++-
> 2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 479f332..7d0983e 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1446,6 +1446,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> disable
> Do not enable intel_pstate as the default
> scaling driver for the supported processors
> + ora_force
> + Force loading intel_pstate on Oracle Sun Servers(X86).
> + only for those who be aware of the risk of no power capping
> + capability working and try to get better performance with this
> + driver.
>
> intremap= [X86-64, Intel-IOMMU]
> on enable Interrupt Remapping (default)
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 1bb62ca..2654e13 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -866,6 +866,7 @@ static struct cpufreq_driver intel_pstate_driver = {
> };
>
> static int __initdata no_load;
> +static unsigned int ora_force;
>
> static int intel_pstate_msrs_not_valid(void)
> {
> @@ -1003,7 +1004,8 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
> case PSS:
> return intel_pstate_no_acpi_pss();
> case PCC:
> - return intel_pstate_has_acpi_ppc();
> + return intel_pstate_has_acpi_ppc() &&
> + (!ora_force);
> }
> }
>
> @@ -1078,6 +1080,8 @@ static int __init intel_pstate_setup(char *str)
>
> if (!strcmp(str, "disable"))
> no_load = 1;
> + if (!strcmp(str, "ora_force"))
> + ora_force = 1;
> return 0;
> }
> early_param("intel_pstate", intel_pstate_setup);
next prev parent reply other threads:[~2014-12-02 18:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-28 3:36 [PATCH 0/2 V4] intel_pstate: skip this driver if hit Sun X86 servers Ethan Zhao
2014-11-28 3:36 ` [PATCH 1/2 V4] intel_pstate: skip this driver if Sun server has _PPC method Ethan Zhao
2014-11-28 5:20 ` Yasuaki Ishimatsu
2014-12-01 1:26 ` ethan zhao
2014-11-28 3:36 ` [PATCH 2/2 V6] intel_pstate: add kernel parameter to force loading on Sun X86 servers Ethan Zhao
2014-11-28 3:36 ` Ethan Zhao
2014-12-02 18:24 ` Kristen Carlson Accardi [this message]
2014-12-03 0:49 ` ethan zhao
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