From owner-freebsd-hackers@freebsd.org Thu Apr 16 16:26:08 2020 Return-Path: Delivered-To: freebsd-hackers@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 BAACF2C10AF for ; Thu, 16 Apr 2020 16:26:08 +0000 (UTC) (envelope-from wojtek@puchar.net) Received: from puchar.net (puchar.net [194.1.144.90]) (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 4934NJ0q8Jz3Dxx for ; Thu, 16 Apr 2020 16:26:07 +0000 (UTC) (envelope-from wojtek@puchar.net) Received: Received: from 127.0.0.1 (localhost [127.0.0.1]) by puchar.net (8.15.2/8.15.2) with ESMTPS id 03GGQ43G004970 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 16 Apr 2020 18:26:04 +0200 (CEST) (envelope-from puchar-wojtek@puchar.net) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=puchar.net; s=default; t=1587054364; bh=VbAavWXbS5CNQROGmQ1aS3Nbk7D9hrrXaehnw+SLujs=; h=Date:From:To:cc:Subject:In-Reply-To:References; b=qoxq5nFfOnCo26GY0deYLGWA9njCFtBiA6B+aCBHlDUCExxaeN10tyJTe0NuV4BX8 04RlXuDJgk5bfeZ6lbT1OmuLNBeeegEWht2YTvI6P/StyOGnwVZMAbnsYMBp+P0o5a KKQUX+XWfUF7LSNifkt7MfGgF4Yu+85yVckKICpk= Received: from localhost (puchar-wojtek@localhost) by puchar.net (8.15.2/8.15.2/Submit) with ESMTP id 03GGQ3hs004959; Thu, 16 Apr 2020 18:26:03 +0200 (CEST) (envelope-from puchar-wojtek@puchar.net) Date: Thu, 16 Apr 2020 18:26:03 +0200 (CEST) From: Wojciech Puchar To: "Rodney W. Grimes" cc: Wojciech Puchar , freebsd-hackers@freebsd.org Subject: Re: fsck parallel check In-Reply-To: <202004161608.03GG8Ym1046249@gndrsh.dnsmgr.net> Message-ID: References: <202004161608.03GG8Ym1046249@gndrsh.dnsmgr.net> User-Agent: Alpine 2.20 (BSF 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Rspamd-Queue-Id: 4934NJ0q8Jz3Dxx X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=fail (rsa verify failed) header.d=puchar.net header.s=default header.b=qoxq5nFf; dmarc=none; spf=pass (mx1.freebsd.org: domain of wojtek@puchar.net designates 194.1.144.90 as permitted sender) smtp.mailfrom=wojtek@puchar.net X-Spamd-Result: default: False [-3.74 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+mx:c]; R_DKIM_REJECT(1.00)[puchar.net:s=default]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[puchar.net]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[puchar.net:-]; RCVD_IN_DNSWL_NONE(0.00)[90.144.1.194.list.dnswl.org : 127.0.10.0]; IP_SCORE(-2.44)[ip: (-6.45), ipnet: 194.1.144.0/24(-3.22), asn: 43476(-2.58), country: PL(0.06)]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:43476, ipnet:194.1.144.0/24, country:PL]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Apr 2020 16:26:08 -0000 >> But it is very good idea to do this on SSD with multiple partitions. > > Why do you state that? > >> From my perspective it is more that one thread is "good enough": > fsck should be I/O bound, more threads on a single ssd should just > lead to I/O queue building and no net reduction in time to complete. > > Do you have some data that contridicts that? > i do checked it. You may check it too. In practice.