From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id 67C2C6B0044 for ; Fri, 18 Dec 2009 13:30:05 -0500 (EST) Date: Fri, 18 Dec 2009 12:28:50 -0600 (CST) From: Christoph Lameter Subject: Re: [PATCH 00 of 28] Transparent Hugepage support #2 In-Reply-To: <20091218051210.GA417@elte.hu> Message-ID: References: <4B2A8D83.30305@redhat.com> <20091218051210.GA417@elte.hu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Ingo Molnar Cc: Rik van Riel , Andrea Arcangeli , linux-mm@kvack.org, Marcelo Tosatti , Adam Litke , Avi Kivity , Izik Eidus , Hugh Dickins , Nick Piggin , Mel Gorman , Andi Kleen , Dave Hansen , Benjamin Herrenschmidt , Mike Travis , KAMEZAWA Hiroyuki , Chris Wright , Andrew Morton , "Stephen C. Tweedie" List-ID: On Fri, 18 Dec 2009, Ingo Molnar wrote: > Note that it became more relevant in the past few years due to the arrival of > low-latency, lots-of-iops and cheap SSDs. Even on a low end server you can buy > a good 160 GB SSD for emergency swap with fantastic latency and for a lot less > money than 160 GB of real RAM. (which RAM wont even fit physically on typical > mainboards, is much more expensive and uses up more power and is less > servicable) Swap occurs in page size chunks. SSDs may help but its still a desaster area. You can only realistically use swap in a batch environment. It kills desktop performance etc etc. -- 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/ . Don't email: email@kvack.org