From owner-freebsd-questions@freebsd.org Thu Feb 13 20:09:55 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 11D0C23312A for ; Thu, 13 Feb 2020 20:09:55 +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 48JSKY61X9z4TlJ for ; Thu, 13 Feb 2020 20:09:53 +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=1581624592; h=From:Subject:Date:To:MIME-Version:Content-Type; bh=mdubk5A8aQhyk36Asvz9mCXd1Ek=; b=QUAK/LZaHBaJQ/yvyoTEJZwOImGBZI5FFSyuk4eUlnFS+EKz9PU/dm6518hDFhRJ mKYXOVd13aTus5qRQM+8uW6/Qn6ijxVezHYsM7AC8MCO6wu5I8Yv26odqgdGqwx1 ds3arR7akxgtC82zvJQ7SjmMspCyscQWfnt0gOFM6srP07591P3KH27BZAkR3KU1 aSbQq3VY6YOFx4wwnoN8Xinz5Lhxhc0y7FdTDqDawRyQbtVIJ3BONuw7u4SCUMZG aIqHtu8lhDDi94NjRaiBa1HDQ34fwVyWItrCxRh+915aDKdf7Ddqgo468kidItBy 5ble8jBLqYp3W4oAYu29CA==; X_CMAE_Category: , , X-CNFS-Analysis: v=2.3 cv=bugy+3Si 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=HCgHwLzU_RojidqA2I4A:9 a=CjuIK1q_8ugA:10 X-CM-Score: 0 X-Scanned-by: Cloudmark Authority Engine X-Authed-Username: cm9iZXJ0aHVmZkByY24uY29t Received: from [209.6.230.48] ([209.6.230.48:39364] 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 BC/31-56402-01DA54E5; Thu, 13 Feb 2020 15:09:52 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <24133.44304.52029.432558@jerusalem.litteratus.org> Date: Thu, 13 Feb 2020 15:09:52 -0500 From: Robert Huff To: tech-lists Cc: freebsd-questions@freebsd.org Subject: Re: questions about swap (partition and file) In-Reply-To: <20200213143411.GA14144@bastion.zyxst.net> References: <20200211155009.GA9715@bastion.zyxst.net> <20200213143411.GA14144@bastion.zyxst.net> X-Mailer: VM 8.2.0b under 26.3 (amd64-portbld-freebsd13.0) X-Rspamd-Queue-Id: 48JSKY61X9z4TlJ X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=rcn.com header.s=20180516 header.b=QUAK/LZa; 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(1.07), 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: Thu, 13 Feb 2020 20:09:55 -0000 tech-lists writes: > >It's usually not a good idea to have swap on a SSD. > > Why is this? The conventional wisdon: Swap can involve lots of reads and lots of writes. SSDs wear out quickly under heavy write load. This "wisdom" may no longer match reality. (I have an SSD in my main workstation; it holds "/" and "/var", both of which get minimal traffic.) Respectfully, Robert Huff