From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx116.postini.com [74.125.245.116]) by kanga.kvack.org (Postfix) with SMTP id 620F36B13F0 for ; Tue, 14 Feb 2012 15:34:26 -0500 (EST) Date: Tue, 14 Feb 2012 12:34:24 -0800 From: Andrew Morton Subject: Re: [Bug 42578] Kernel crash "Out of memory error by X" when using NTFS file system on external USB Hard drive Message-Id: <20120214123424.a4162251.akpm@linux-foundation.org> In-Reply-To: References: <201201180922.q0I9MCYl032623@bugzilla.kernel.org> <20120119122448.1cce6e76.akpm@linux-foundation.org> <20120210163748.GR5796@csn.ul.ie> <4F36DD77.1080306@ntlworld.com> <20120214130955.GM17917@csn.ul.ie> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: Mel Gorman , Stuart Foster , linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org, Rik van Riel , Johannes Weiner On Tue, 14 Feb 2012 14:00:47 -0600 (CST) Christoph Lameter wrote: > On Tue, 14 Feb 2012, Mel Gorman wrote: > > > Thanks Stuart. Rik, Andrew, should the following be improved in some > > way? I did not come to any decent conclusion on what to do with pages in > > the inactive list with buffer_head as we are already stripping them when > > the pages reach the end of the LRU. > > We have made the statement in the past that configurations > 8GB on 32 > bit should not be considered stable or supported? The fact is the more > memory you add on 32 bit the less low mem memory is available and the more > likely that an OOM will occur for any number of reasons. I have memories of 16G being usable in earlier kernels. Also, if an 8G machine works OK at present, it's only by luck. sizeof(buffer_head) is around 100, so it takes 1.6GB of buffer_heads to support 8G of 512-byte blocksize pagecache. -- 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