From owner-freebsd-questions@freebsd.org Fri Feb 14 12:54:09 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id AEC44233C9B for ; Fri, 14 Feb 2020 12:54:09 +0000 (UTC) (envelope-from roberthuff@rcn.com) Received: from smtp.rcn.com (smtp.rcn.com [69.168.97.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 48JtcJ6KTWz4Y5F for ; Fri, 14 Feb 2020 12:54:08 +0000 (UTC) (envelope-from roberthuff@rcn.com) DKIM-Signature: v=1; a=rsa-sha1; d=rcn.com; s=20180516; c=relaxed/simple; q=dns/txt; i=@rcn.com; t=1581684847; h=From:Subject:Date:To:MIME-Version:Content-Type; bh=beh2WpRxu1Oo4tBVM57VRxpAH+Q=; b=Fqfo3kjylwbysLXg8v3qCK7Fj1Gn3FBuLrvCfvwKwm7/W0orNuInN7rSPKOKeCYu Gvf3Ic8EyQ+1nblxbRdE2LLJssBXwaq6Fs2FEVtYfSKu71IRqAEPihzyWI0x+3Fp A+ylArAGezet6crHYuH9KWPcIiNnoylXjTiiGNs3VpCDtpSX0BNLv8WXq2/gk+sp Ahgka5GzDAHdZ/zZisOQa3lKrueiBwdxqSQLipKpnn+xBqmdpeR/eiXS4c35O7Pz 0GrQ4IE3dgq0/Xk7mQzbucjRkttIWz/wgRz01yzLjhq4YxpQWJk8wPnlwDdlw4Qp wcXOz6GUW8KNEHv8Pq3zcg==; X_CMAE_Category: , , X-CNFS-Analysis: v=2.3 cv=JbTCUnCV c=1 sm=1 tr=0 a=9TgA2UwI6Wy+6BV4wQM/cQ==:117 a=9TgA2UwI6Wy+6BV4wQM/cQ==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=KGjhK52YXX0A:10 a=kj9zAlcOel0A:10 a=XRQyMpdBKAEA:10 a=l697ptgUJYAA:10 a=48faUk6PgeAA:10 a=v5q66hbE5jtxtzd_Q6MA:9 a=_ktoMapBwxiRMH5N:21 a=kXVeEEUQb59sWiTD:21 a=CjuIK1q_8ugA:10 a=Kvc0hPm1paQA:10 X-CM-Score: 0 X-Scanned-by: Cloudmark Authority Engine X-Authed-Username: cm9iZXJ0aHVmZkByY24uY29t Received: from [209.6.230.48] ([209.6.230.48:54523] helo=jerusalem.litteratus.org.litteratus.org) by smtp.rcn.com (envelope-from ) (ecelerity 3.6.25.56547 r(Core:3.6.25.0)) with ESMTPSA (cipher=AES256-GCM-SHA384) id 16/3B-44953-F68964E5; Fri, 14 Feb 2020 07:54:07 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <24134.39022.519866.759080@jerusalem.litteratus.org> Date: Fri, 14 Feb 2020 07:54:06 -0500 From: Robert Huff To: tech-lists Cc: freebsd-questions@freebsd.org Subject: Re: some questions about disk partitioning and filesystems and booting In-Reply-To: <20200214121003.GB39057@bastion.zyxst.net> References: <20200213150229.GC14144@bastion.zyxst.net> <20200213155256.GD14144@bastion.zyxst.net> <1090523a-377c-9412-5db1-38e825e35956@mm.st> <20200214121003.GB39057@bastion.zyxst.net> X-Mailer: VM 8.2.0b under 26.3 (amd64-portbld-freebsd13.0) X-Rspamd-Queue-Id: 48JtcJ6KTWz4Y5F X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=rcn.com header.s=20180516 header.b=Fqfo3kjy; dmarc=pass (policy=none) header.from=rcn.com; spf=pass (mx1.freebsd.org: domain of roberthuff@rcn.com designates 69.168.97.78 as permitted sender) smtp.mailfrom=roberthuff@rcn.com X-Spamd-Result: default: False [-5.58 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[rcn.com:s=20180516]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:69.168.97.0/24]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; IP_SCORE(-1.48)[ip: (-9.30), ipnet: 69.168.97.0/24(1.06), asn: 36271(0.89), country: US(-0.05)]; DWL_DNSWL_LOW(-1.00)[rcn.com.dwl.dnswl.org : 127.0.5.1]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[rcn.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[rcn.com,none]; RCVD_IN_DNSWL_LOW(-0.10)[78.97.168.69.list.dnswl.org : 127.0.5.1]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:36271, ipnet:69.168.97.0/24, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Feb 2020 12:54:09 -0000 tech-lists writes: > On Thu, Feb 13, 2020 at 07:06:54PM +0300, yp@mm.st wrote: > >Now this is something I wanted to ask as well, as I didn't find > >anything really describing what needs to be done for large (not really > >so this days, 32 and higher) RAM systems -- I have a system with 64GB > >RAM and adding a 64GB swap partition makes system unhappy (I don't > >remember the exact message). With minidumps and all, what size it > >should be so that dump is guaranteed to be saved? > > A while ago I tried this (one big swap partition) and experienced the same. > This is why I went with several swap partitions. I think the maximum swap as a > partition is 32GB and I'm guessing the reason it's like that is down to > some variable buried in the code. _If_ that's true, then it's a bug and needs to be fixed. The folks posting here may not need it ... but I find it hard to imagine various organizations that use FreeBSD (or would like to) on hardcore server hardware wouldn't find that a substantial liability. While this may be more suited to hackers@: can anyone here confirm there is an encoded limit on swap space? Respectfully, Robert Huff