From: Matthew Garrett <mjg59@srcf.ucam.org>
To: ShuoX Liu <shuox.liu@intel.com>
Cc: "Brown, Len" <len.brown@intel.com>,
Yanmin Zhang <yanmin_zhang@linux.intel.com>,
Greg KH <gregkh@linuxfoundation.org>, Ingo Molnar <mingo@elte.hu>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
"H. Peter Anvin" <hpa@zytor.com>,
"Kleen, Andi" <andi.kleen@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
"linux-pm@lists.linux-foundation.org"
<linux-pm@lists.linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 2/3] cpuidle: Add a debugfs entry to disable specific C state for debug purpose.
Date: Mon, 12 Mar 2012 20:46:30 +0000 [thread overview]
Message-ID: <20120312204629.GA22929@srcf.ucam.org> (raw)
In-Reply-To: <4F5DC01D.7040006@intel.com>
On Mon, Mar 12, 2012 at 05:21:33PM +0800, ShuoX Liu wrote:
> In addition, C state might have much impact on performance tuning,
> as it takes
> much time to enter/exit C states, which might delay interrupt
> processing. With
> the new debug option, developers could check if a deep C state could impact
> performance and how much impact it could cause.
Would anyone doing performance tuning not be using the cpu_dma_latency
interface?
--
Matthew Garrett | mjg59@srcf.ucam.org
WARNING: multiple messages have this Message-ID (diff)
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: ShuoX Liu <shuox.liu@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Greg KH <gregkh@linuxfoundation.org>,
Yanmin Zhang <yanmin_zhang@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Valentin, Eduardo" <eduardo.valentin@ti.com>,
Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
"Brown, Len" <len.brown@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>, "Kleen, Andi" <andi.kleen@intel.com>,
"linux-pm@lists.linux-foundation.org"
<linux-pm@lists.linux-foundation.org>
Subject: Re: [PATCH 2/3] cpuidle: Add a debugfs entry to disable specific C state for debug purpose.
Date: Mon, 12 Mar 2012 20:46:30 +0000 [thread overview]
Message-ID: <20120312204629.GA22929@srcf.ucam.org> (raw)
In-Reply-To: <4F5DC01D.7040006@intel.com>
On Mon, Mar 12, 2012 at 05:21:33PM +0800, ShuoX Liu wrote:
> In addition, C state might have much impact on performance tuning,
> as it takes
> much time to enter/exit C states, which might delay interrupt
> processing. With
> the new debug option, developers could check if a deep C state could impact
> performance and how much impact it could cause.
Would anyone doing performance tuning not be using the cpu_dma_latency
interface?
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2012-03-12 20:46 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-29 4:55 Subject: [PATCH] cpuidle: Add a sysfs entry to disable specific C state for debug purpose Liu, ShuoX
2012-03-02 0:17 ` Yanmin Zhang
2012-03-02 22:23 ` Andrew Morton
2012-03-05 1:34 ` Yanmin Zhang
2012-03-05 3:22 ` Liu, ShuoX
2012-03-05 6:16 ` Deepthi Dharwar
2012-03-05 6:16 ` Deepthi Dharwar
2012-03-05 7:09 ` [PATCH V3] " ShuoX Liu
2012-03-05 10:18 ` Henrique de Moraes Holschuh
2012-03-05 12:20 ` Valentin, Eduardo
2012-03-05 12:20 ` [linux-pm] " Valentin, Eduardo
2012-03-06 1:54 ` Yanmin Zhang
2012-03-06 5:22 ` Greg KH
2012-03-06 5:51 ` Yanmin Zhang
2012-03-06 14:39 ` Greg KH
[not found] ` <1331082051.1916.124.camel@ymzhang>
[not found] ` <20120308180106.GD26516@kroah.com>
2012-03-12 9:19 ` [PATCH 1/3] cpuidle: Move cpuidle sysfs entry of each cpu to debugfs ShuoX Liu
2012-03-12 9:21 ` [PATCH 2/3] cpuidle: Add a debugfs entry to disable specific C state for debug purpose ShuoX Liu
2012-03-12 20:46 ` Matthew Garrett [this message]
2012-03-12 20:46 ` Matthew Garrett
2012-03-12 9:23 ` [PATCH 3/3] cpupower: Update the cpupower tool for new debugfs entries of cpuidle ShuoX Liu
2012-03-12 17:22 ` [PATCH 1/3] cpuidle: Move cpuidle sysfs entry of each cpu to debugfs Greg KH
2012-03-13 2:07 ` ShuoX Liu
2012-03-12 18:11 ` [PATCH V3] cpuidle: Add a sysfs entry to disable specific C state for debug purpose Mark Brown
2012-03-12 18:11 ` [linux-pm] " Mark Brown
2012-03-12 19:29 ` Greg KH
2012-03-13 1:36 ` Yanmin Zhang
2012-03-13 19:29 ` Greg KH
2012-03-14 0:55 ` Yanmin Zhang
2012-03-14 2:46 ` Greg KH
2012-03-14 3:24 ` [linux-pm] [PATCH v4] " ShuoX Liu
2012-03-16 0:23 ` Yanmin Zhang
2012-03-16 0:23 ` Yanmin Zhang
2012-03-16 21:33 ` Andrew Morton
2012-03-16 21:33 ` [linux-pm] " Andrew Morton
2012-03-18 13:38 ` Henrique de Moraes Holschuh
2012-03-18 13:38 ` [linux-pm] " Henrique de Moraes Holschuh
2012-03-16 22:23 ` Andrew Morton
2012-03-16 22:23 ` [linux-pm] " Andrew Morton
2012-03-06 1:04 ` [PATCH V3] " Yanmin Zhang
2012-03-13 0:42 ` Henrique de Moraes Holschuh
2012-03-13 0:42 ` Henrique de Moraes Holschuh
2012-03-13 1:18 ` Yanmin Zhang
2012-03-13 20:49 ` Henrique de Moraes Holschuh
2012-03-13 20:49 ` Henrique de Moraes Holschuh
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