From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx115.postini.com [74.125.245.115]) by kanga.kvack.org (Postfix) with SMTP id 3BD176B0036 for ; Wed, 3 Apr 2013 10:11:30 -0400 (EDT) Message-ID: <515C388C.5040903@profihost.ag> Date: Wed, 03 Apr 2013 16:11:24 +0200 From: Stefan Priebe - Profihost AG MIME-Version: 1.0 Subject: Re: NUMA Autobalancing Kernel 3.8 References: <515A87C3.1000309@profihost.ag> <20130402104844.GE32241@suse.de> <515AC3EE.1030803@profihost.ag> <20130402125408.GG32241@suse.de> <515AEC71.9020704@profihost.ag> <20130403140344.GA5811@suse.de> In-Reply-To: <20130403140344.GA5811@suse.de> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: "linux-mm@kvack.org" , srikar@linux.vnet.ibm.com, aarcange@redhat.com, mingo@kernel.org, riel@redhat.com Am 03.04.2013 16:03, schrieb Mel Gorman: >> I've now tested 3.9-rc5 this gaves me a slightly different kernel log: >> [ 197.236518] pigz[2908]: segfault at 0 ip (null) sp >> 00007f347bffed00 error 14 >> [ 197.237632] traps: pigz[2915] general protection ip:7f3482dbce2d >> sp:7f3473ffec10 error:0 in libz.so.1.2.3.4[7f3482db7000+17000] >> [ 197.330615] in pigz[400000+10000] >> >> With 3.8 it is the same as with 3.8.4 or 3.8.5. >> > > Ok. Are there NUMA machines were you do *not* see this problem? Sadly no. I can really fast reproduce it with this one: 1.) Machine with only 16GB Mem 2.) compressing two 60GB Files in parallel with pigz consuming all cores > If so, can you spot what the common configuration, software or hardware, that > affects the broken machines versus the working machines? I'm wondering > if there is a bug in a migration handler. > > Do you know if a NUMA nodes are low on memory when the segfaults occur? One of them is but the others aren't. (196GB Mem just 20GB in use) Stefan -- 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