From owner-freebsd-hackers@freebsd.org Sat Dec 1 20:55:55 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 4E07313277BD for ; Sat, 1 Dec 2018 20:55:55 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-qt1-x829.google.com (mail-qt1-x829.google.com [IPv6:2607:f8b0:4864:20::829]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id ADB117410E for ; Sat, 1 Dec 2018 20:55:54 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: by mail-qt1-x829.google.com with SMTP id d19so9789859qtq.9 for ; Sat, 01 Dec 2018 12:55:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=9NvvRRjOcFG2RD3xTkR/aTY+nfwaRLvgNsjhhLuqCM4=; b=OU+hqdczVT3rvErUccPRZE2LmynSWCOJurNAGNdXnUH7ECLH38txuPeOkkqg6M/nCd JkU5FT5dIsBo8kuh3WRgwHIA3VKkPFZwW5Zx5pFhBirfM0DaibpvqkoiFAI75RUzE0MU J/t3nIGUuOJzzyW/eVvdfXW/fc+OiMEl3DIMN8vaR/o+vYqUzMAFhQ9sylDeZd6IuRsN 6M7oppr9d/4g3AaxF48orVfzPSLvc/L674m+pkp3b8j4TEGtThQO7ttoqpNyl01MPMaZ UcPWy0Rjf12u/dZrtZkweLx3dCls+XFijnC4sHngPoqaaiCxp6cI/1QyugaywWtVFXPB YKng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=9NvvRRjOcFG2RD3xTkR/aTY+nfwaRLvgNsjhhLuqCM4=; b=Bva5IUw6g93eUUxNcFqKMs7Y6L/+gZwKvHdyv5egMgIJRhHPVv3kViwR1uE/h9Asyj t5L9IjHdxM+bUsLhfhtTTvQ1jSeFMMuDE+Xp/6tXHRQBeLG+SevukBTGgIp4oTeRLb1f RoXHOKUv+sqzN0XWzFqrPDWOGlmu323G4umx+0bbaD3wGcfiFf6yvsNtWyIIJbMit/vB oICZsxaq/2D4XefhbGB2npK8bb4gr9jp0FgE5jigLMb9CmwchN4kFRLj1URzlkQrVsCD AIM/Hd46G+nSFyG3ORVmgFTqi5o0pmGWkpSqhYpxGz2iTBtrQ4bvzCIFv2d5vipRhKRl N2GQ== X-Gm-Message-State: AA+aEWb+A8Sb0KiOiLzkZFyQW+w/jZwu9opkmxhvzrzh3935CPNVaVHb D+t6Xip/sZKG6/0Xfq06qiJWDNQCcU1VIB1oiJhMUw== X-Google-Smtp-Source: AFSGD/UEvbe6ZqQthzKulAV41XeId7OdznH3o42Ob3z+tm8a4VYiETHBmrl+39qXIYv+dhbLkhowfDczcYDWdPTnB0c= X-Received: by 2002:ac8:548a:: with SMTP id h10mr10440915qtq.15.1543697754209; Sat, 01 Dec 2018 12:55:54 -0800 (PST) MIME-Version: 1.0 References: <7e69211c-6ffb-6155-b17a-a845c0b3586d@grosbein.net> <20181201.093153.893601099798031027.ish@amail.plala.or.jp> <1c7139bd-258c-e7d2-2572-052da3803b3b@freebsd.org> <20181201.202332.546134930481017424.ish@amail.plala.or.jp> In-Reply-To: <20181201.202332.546134930481017424.ish@amail.plala.or.jp> From: Warner Losh Date: Sat, 1 Dec 2018 13:55:43 -0700 Message-ID: Subject: Re: How to use trim command ?,Re: How to use trim command ? To: ish@amail.plala.or.jp Cc: "freebsd-hackers@freebsd.org" X-Rspamd-Queue-Id: ADB117410E X-Spamd-Result: default: False [-2.45 / 15.00]; ARC_NA(0.00)[]; TO_DN_EQ_ADDR_SOME(0.00)[]; R_DKIM_ALLOW(-0.20)[bsdimp-com.20150623.gappssmtp.com]; NEURAL_HAM_MEDIUM(-0.97)[-0.970,0]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_SHORT(-0.87)[-0.875,0]; NEURAL_HAM_LONG(-0.97)[-0.971,0]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; DMARC_NA(0.00)[bsdimp.com]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[bsdimp-com.20150623.gappssmtp.com:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[9.2.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; MX_GOOD(-0.01)[cached: ALT1.aspmx.l.google.com]; R_SPF_NA(0.00)[]; FORGED_SENDER(0.30)[imp@bsdimp.com,wlosh@bsdimp.com]; SUBJECT_ENDS_QUESTION(1.00)[]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[imp@bsdimp.com,wlosh@bsdimp.com]; IP_SCORE(-0.62)[ipnet: 2607:f8b0::/32(-1.70), asn: 15169(-1.31), country: US(-0.09)]; RCVD_COUNT_TWO(0.00)[2] X-Rspamd-Server: mx1.freebsd.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 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: Sat, 01 Dec 2018 20:55:55 -0000 On Sat, Dec 1, 2018 at 4:41 AM Masachika ISHIZUKA wrote: > >> I misunderstood trim was equivalent to fstrim in linux. > >> I undotstood that the trim command is the SSD bulk erase tool. > > > > If you want to enable TRIM on a UFS filesystem, tunefs is the command > > you are looking for. > > Thank you for mail. > > I'm using 'tunefs -t enable /dev/ada0pXX', that is equivalent > to 'discard' in fstab on linux. > > > The equivalent to fstrim for UFS is fsck_ffs -E: > > I think 'fsck_ffs -E' is not suitable for daily midnight cron > job. > FreeBSD doesn't have an equivalent of a daemon that runs and trims blocks after a while of being idle (trimd on linux I think). Warner