Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757287Ab2JEVch (ORCPT ); Fri, 5 Oct 2012 17:32:37 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:43085 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753730Ab2JEVce (ORCPT ); Fri, 5 Oct 2012 17:32:34 -0400 From: ebiederm@xmission.com (Eric W. Biederman) To: Yinghai Lu Cc: Konrad Rzeszutek Wilk , Jacob Shin , Stefano Stabellini , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Tejun Heo , "linux-kernel\@vger.kernel.org" References: <1348991844-12285-1-git-send-email-yinghai@kernel.org> <1348991844-12285-5-git-send-email-yinghai@kernel.org> <20121003165105.GA30214@jshin-Toonie> <20121004164630.GB2244@phenom.dumpdata.com> <871uhcsk93.fsf@xmission.com> Date: Fri, 05 Oct 2012 14:32:26 -0700 In-Reply-To: (Yinghai Lu's message of "Fri, 5 Oct 2012 14:19:37 -0700") Message-ID: <87ehlcr4et.fsf@xmission.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=;;;mid=;;;hst=in01.mta.xmission.com;;;ip=98.207.153.68;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1+T62akLl5Y5GwbI1sDsOfNzhVLocXSEI8= X-SA-Exim-Connect-IP: 98.207.153.68 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 1.5 XMNoVowels Alpha-numberic number with no vowels * 0.1 XMSubLong Long Subject * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -3.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa06 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 T_TooManySym_01 4+ unique symbols in subject * 0.0 T_TooManySym_02 5+ unique symbols in subject X-Spam-DCC: XMission; sa06 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ;Yinghai Lu X-Spam-Relay-Country: Subject: Re: [PATCH 04/13] x86, mm: Revert back good_end setting for 64bit X-Spam-Flag: No X-SA-Exim-Version: 4.2.1 (built Fri, 06 Aug 2010 16:31:04 -0600) X-SA-Exim-Scanned: Yes (on in01.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 989 Lines: 29 Yinghai Lu writes: > On Fri, Oct 5, 2012 at 2:04 PM, Eric W. Biederman wrote: >>>> Is there a git commit that explains what the 'big range' problem is? >> >> At least on x86_64 this was recently tested and anywhere below 4G is >> good, and there is a patch floating around somewhere to remove this >> issue. > > patch for kernel or kexec-tools? kernel. The sgi guys needed a kdump kernel with 1G of ram to dump their all of the memory on one of their crazy large machines and so investigated this. Basically they found that a kdump kernel loaded anywhere < 4G worked, the only change that was needed was to relaxy the 896M hard code. In one test they had a kdump kernel loaded above 2G. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/