From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Artem S. Tashkinov" Subject: Re: IO errors after "block: remove =?UTF-8?Q?bio=5Fget=5Fnr=5Fvec?= =?UTF-8?Q?s=28=29=22?= Date: Mon, 21 Dec 2015 09:43:22 +0500 Message-ID: <3c353dc4883c60ee99caa4555c81b6a1@lycos.com> References: <20aa515947cdc15799f520f904ad99a2@lycos.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from smtprelay0060.b.hostedemail.com ([64.98.42.60]:44229 "EHLO smtprelay.b.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750802AbbLUEnZ (ORCPT ); Sun, 20 Dec 2015 23:43:25 -0500 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Linus Torvalds Cc: Ming Lei , Kent Overstreet , Christoph Hellwig , Ming Lin , Jens Axboe , "Artem S. Tashkinov" , Steven Whitehouse , Tejun Heo , IDE-ML , Linux Kernel Mailing List , linus971@gmail.com On 2015-12-21 09:32, Linus Torvalds wrote: > 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. > In the past I happily ran an x86_64 bit kernel together with 32bit userland for quite some time but then I hit a wall: VirtualBox expects its kernel modules to have the same bitness as the application itself so I had to revert back to an i686 PAE setup. It's probably high time to try qemu however last time I looked at it a few years ago it lacked several crucial features I need from a VM.