From owner-svn-src-all@freebsd.org Thu Dec 14 15:39:37 2017 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B64D5E8460E; Thu, 14 Dec 2017 15:39:37 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [78.47.246.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4B1356900E; Thu, 14 Dec 2017 15:39:36 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged)) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id vBEFdQOR037211 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 14 Dec 2017 16:39:27 +0100 (CET) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: kostikbel@gmail.com Received: from eg.sd.rdtc.ru (eugen@localhost [127.0.0.1]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTP id vBEFdIqU002699; Thu, 14 Dec 2017 22:39:18 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: svn commit: r326758 - in head/sys/i386: conf include To: Konstantin Belousov References: <20171211091943.GF2272@kib.kiev.ua> <5A2E5D44.9030904@grosbein.net> <4a9c76c9-8063-9420-b198-14487b089840@FreeBSD.org> <5A30378A.3040609@grosbein.net> <5A3261BD.5050404@grosbein.net> <20171214115149.GC2272@kib.kiev.ua> <5A3268E9.506@grosbein.net> <20171214122659.GF2272@kib.kiev.ua> <5A327597.3010300@grosbein.net> <20171214152324.GJ2272@kib.kiev.ua> Cc: John Baldwin , Conrad Meyer , src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org From: Eugene Grosbein Message-ID: <5A329B26.9040504@grosbein.net> Date: Thu, 14 Dec 2017 22:39:18 +0700 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <20171214152324.GJ2272@kib.kiev.ua> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=2.2 required=5.0 tests=BAYES_00, LOCAL_FROM, RDNS_NONE, T_DATE_IN_FUTURE_Q_PLUS autolearn=no autolearn_force=no version=3.4.1 X-Spam-Report: * 0.0 T_DATE_IN_FUTURE_Q_PLUS Date: is over 4 months after Received: date * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains * 1.9 RDNS_NONE Delivered to internal network by a host with no rDNS X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net X-Spam-Level: ** X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Dec 2017 15:39:37 -0000 On 14.12.2017 22:23, Konstantin Belousov wrote: >>> Sigh. This would make i386 even less usable for everybody, perhaps >>> except you. Because default 3G of UVA is too small for some common tasks >>> (thanks clang, but also e.g. pypy), and you reduce the user address >>> space even more. >> >> Those who need 3GB of UVA within single process should not use 32 bit system in first place, should they? > > Why do you even consider it acceptable to break the configuration just > because you are not interested in the workload ? I do not consider it is acceptable. I'm trying to find compromise. > 3G cumulative VA does not translate into 3G of usable addresses: the bss > is reserved, the address space is fragmented due to need of growing > stack to not conflict with mmaped regions. As result, applications get > slightly less than 2G usable without tricks, and to apply the tricks > apps must know details of the AS layout, i.e. breaking the portability. > > 386 arch configuration is not perfect but it provides the main intended > service of general-purpose workstation, with some limitation caused by > 32bit of address space being somewhat low for modern code. Appliance > flavoring of the default 386 config is unacceptable. Keep your tweaks > local. Do you think that kstack overflow of general-purpose workstation using NFS or IPv6 or WiFi with SCTP is OK? I do not.