Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750985AbbLUEcX (ORCPT ); Sun, 20 Dec 2015 23:32:23 -0500 Received: from mail-io0-f179.google.com ([209.85.223.179]:36642 "EHLO mail-io0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750738AbbLUEcV (ORCPT ); Sun, 20 Dec 2015 23:32:21 -0500 MIME-Version: 1.0 In-Reply-To: <20aa515947cdc15799f520f904ad99a2@lycos.com> References: <20aa515947cdc15799f520f904ad99a2@lycos.com> Date: Sun, 20 Dec 2015 20:32:20 -0800 X-Google-Sender-Auth: QQeWKOpJ93ZsAWAR5VeXGllsUuY Message-ID: Subject: Re: IO errors after "block: remove bio_get_nr_vecs()" From: Linus Torvalds To: "Artem S. Tashkinov" Cc: Ming Lei , Kent Overstreet , Christoph Hellwig , Ming Lin , Jens Axboe , "Artem S. Tashkinov" , Steven Whitehouse , Tejun Heo , IDE-ML , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1500 Lines: 30 On Sun, Dec 20, 2015 at 5:50 PM, Artem S. Tashkinov wrote: > > P.S. I know Linus doesn't condone PAE but I still find it more preferrable > than running a mixed environment with almost zero benefit in regard to > performance and quite obvious performance regressions related to an > increased number of libraries being loaded (i686 + x86_64) and slightly > bloated code which sometimes cannot fit in the CPU cache. Call me old > fashioned but I won't upgrade to x86_64 until most of the things that I run > locally are available for x86_64 and that won't happen any time soon. Don't upgrade *user* land. User land doesn't use the braindamage that is PAE. Just run a 64-bit kernel. Keep all your 32-bit userland apps and libraries. Trust me, that *will* be faster. PAE works really horribly badly, because all your really important data structures like your inodes and directory cache will all be in the low 1GB even if you have 16BG of RAM. Of course, I'd also like more people to run things that way just to get more coverage of the whole "yes, we do all the compat stuff correctly". So I have some other reasons to prefer people running 64-bit kernels with 32-bit user land. But PAE really is a disaster. Linus -- 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/