From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx160.postini.com [74.125.245.160]) by kanga.kvack.org (Postfix) with SMTP id 370C36B13F0 for ; Tue, 14 Feb 2012 15:42:52 -0500 (EST) Date: Tue, 14 Feb 2012 14:42:49 -0600 (CST) From: Christoph Lameter Subject: Re: [Bug 42578] Kernel crash "Out of memory error by X" when using NTFS file system on external USB Hard drive In-Reply-To: <20120214123424.a4162251.akpm@linux-foundation.org> Message-ID: 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> <20120214123424.a4162251.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Mel Gorman , Stuart Foster , linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org, Rik van Riel , Johannes Weiner On Tue, 14 Feb 2012, Andrew Morton wrote: > 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. 16G regularly fell over in our environment so we now have an 8G max restriction for those still using 32 bit. > 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. Well the slow kernel degradation in operation again. We also require those 32 bit guys with the 8G limit to run older kernel versions... -- 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