| 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
| ||
|
Date: Tue, 13 Nov 2012 13:56:45 -0800 From: Arjan van de Ven <arjan@...ux.intel.com> To: paulmck@...ux.vnet.ibm.com CC: Jacob Pan <jacob.jun.pan@...ux.intel.com>, Linux PM <linux-pm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Rafael Wysocki <rafael.j.wysocki@...el.com>, Len Brown <len.brown@...el.com>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>, Zhang Rui <rui.zhang@...el.com>, Rob Landley <rob@...dley.net> Subject: Re: [PATCH 3/3] PM: Introduce Intel PowerClamp Driver On 11/13/2012 1:16 PM, Paul E. McKenney wrote: > On Mon, Nov 12, 2012 at 02:03:51PM -0800, Jacob Pan wrote: >> Intel PowerClamp driver performs synchronized idle injection across >> all online CPUs. The goal is to maintain a given package level C-state >> ratio. >> >> Compared to other throttling methods already exist in the kernel, >> such as ACPI PAD (taking CPUs offline) and clock modulation, this is often >> more efficient in terms of performance per watt. >> >> Please refer to Documentation/thermal/intel_powerclamp.txt for more details. > > If I read this correctly, this forces a group of CPUs into idle for > about 600 milliseconds at a time. This would indeed delay grace periods, 6ms not 600 -- 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/
Powered by blists - more mailing lists