From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 91C146B0082 for ; Fri, 10 Jun 2011 12:00:56 -0400 (EDT) Date: Fri, 10 Jun 2011 16:59:54 +0100 From: Matthew Garrett Subject: Re: [PATCH 00/10] mm: Linux VM Infrastructure to support Memory Power Management Message-ID: <20110610155954.GA25774@srcf.ucam.org> References: <1306499498-14263-1-git-send-email-ankita@in.ibm.com> <20110528005640.9076c0b1.akpm@linux-foundation.org> <20110609185259.GA29287@linux.vnet.ibm.com> <20110610151121.GA2230@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110610151121.GA2230@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Paul E. McKenney" Cc: Kyungmin Park , Andrew Morton , Ankita Garg , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org, svaidy@linux.vnet.ibm.com, thomas.abraham@linaro.org On Fri, Jun 10, 2011 at 08:11:21AM -0700, Paul E. McKenney wrote: > Of course, on a server, you could get similar results by having a very > large amount of memory (say 256GB) and a workload that needed all the > memory only occasionally for short periods, but could get by with much > less (say 8GB) the rest of the time. I have no idea whether or not > anyone actually has such a system. For the server case, the low hanging fruit would seem to be finer-grained self-refresh. At best we seem to be able to do that on a per-CPU socket basis right now. The difference between active and self-refresh would seem to be much larger than the difference between self-refresh and powered down. -- Matthew Garrett | mjg59@srcf.ucam.org -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org