From owner-freebsd-questions@freebsd.org Mon Feb 10 07:46:09 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 2A461231303 for ; Mon, 10 Feb 2020 07:46:09 +0000 (UTC) (envelope-from 4250.10.freebsd-questions=freebsd.org@email-od.com) Received: from s1-b0c6.socketlabs.email-od.com (s1-b0c6.socketlabs.email-od.com [142.0.176.198]) (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 48GHym1j2Dz46qR for ; Mon, 10 Feb 2020 07:46:07 +0000 (UTC) (envelope-from 4250.10.freebsd-questions=freebsd.org@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1581320768; x=1583912768; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:to:from:date:x-thread-info; bh=NkqNbiynWHM3WF3g8xVs85JGmycOXu25byGvCN2Wld0=; b=EluoBha5U1Az3PX7NvEqEi1rP3czao1pWtp4N3hDjYCpry3Dj8aR0uRSKY+/Xd4bLpbEnHG6R6QUIjs/ELaWVQoRKAza5clgpVCVKijc6kTZK2dwKRETKNHGdCcRdeX669xHLFo+zWUE1cxYckfjp+ekbxiviEGmm/BOxZDNFq8= X-Thread-Info: NDI1MC4xMi42ZTAwMDAwMmI5ZjZmNy5mcmVlYnNkLXF1ZXN0aW9ucz1mcmVlYnNkLm9yZw== Received: from r2.us-east-2.aws.in.socketlabs.com (r2.us-east-2.aws.in.socketlabs.com [142.0.189.2]) by mxsg2.email-od.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Mon, 10 Feb 2020 02:45:59 -0500 Received: from smtp.lan.sohara.org (EMTPY [185.202.17.215]) by r2.us-east-2.aws.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Mon, 10 Feb 2020 02:45:58 -0500 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.92.3 (FreeBSD)) (envelope-from ) id 1j13lU-000Bmd-0U for freebsd-questions@freebsd.org; Mon, 10 Feb 2020 07:45:56 +0000 Date: Mon, 10 Feb 2020 07:45:55 +0000 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Subject: Re: Bad ZFS performance on the desktop Message-Id: <20200210074555.7f409476708f05bd10c1efb0@sohara.org> In-Reply-To: <17394471581319158@vla1-b55dfea406f0.qloud-c.yandex.net> References: <17394471581319158@vla1-b55dfea406f0.qloud-c.yandex.net> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; amd64-portbld-freebsd12.0) X-Clacks-Overhead: "GNU Terry Pratchett" Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 48GHym1j2Dz46qR X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=email-od.com header.s=dkim header.b=EluoBha5; dmarc=none; spf=pass (mx1.freebsd.org: domain of 4250.10.freebsd-questions=freebsd.org@email-od.com designates 142.0.176.198 as permitted sender) smtp.mailfrom=4250.10.freebsd-questions=freebsd.org@email-od.com X-Spamd-Result: default: False [-1.86 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.97)[-0.974,0]; R_DKIM_ALLOW(-0.20)[email-od.com:s=dkim]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:142.0.176.0/20]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[sohara.org]; FORGED_SENDER_VERP_SRS(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; RCVD_COUNT_THREE(0.00)[4]; IP_SCORE(0.11)[ip: (-0.31), ipnet: 142.0.176.0/22(0.62), asn: 7381(0.30), country: US(-0.05)]; MV_CASE(0.50)[]; DKIM_TRACE(0.00)[email-od.com:+]; RCVD_IN_DNSWL_NONE(0.00)[198.176.0.142.list.dnswl.org : 127.0.15.0]; ENVFROM_VERP(0.00)[]; FORGED_SENDER(0.00)[steve@sohara.org,4250.10.freebsd-questions=freebsd.org@email-od.com]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:7381, ipnet:142.0.176.0/22, country:US]; FROM_NEQ_ENVFROM(0.00)[steve@sohara.org,4250.10.freebsd-questions=freebsd.org@email-od.com]; MID_RHS_MATCH_FROM(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: Mon, 10 Feb 2020 07:46:09 -0000 On Mon, 10 Feb 2020 07:19:18 +0000 Erik Lauritsen wrote: > I have monitored ZFS using 'top' and can see that it never eats > more than half of my memory, so it's not because I'm out of > memory. Is there any sign of swap activity ? This sounds a lot like swap thrashing. > I'm thinking about getting a couple of SSDs, but then again I use > backup meticulously and perhaps ZFS on a single drive or just UFS > is better for the desktop? I'm using ZFS on a single SSD for boot (with everything important mounted from a NAS running a bunch of mirrors), it's fast but I did have to set vfs.zfs.arc_max in /boot/loader.conf (to 2GB on my 8GB machine) in order to stop browsers thrashing swap. -- Steve O'Hara-Smith