From owner-freebsd-current@freebsd.org Wed Sep 5 14:50:53 2018 Return-Path: Delivered-To: freebsd-current@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 0D0C3FF27E4; Wed, 5 Sep 2018 14:50:53 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) (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 841588440D; Wed, 5 Sep 2018 14:50:52 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by mail-pf1-x434.google.com with SMTP id k19-v6so3621572pfi.1; Wed, 05 Sep 2018 07:50:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Oi8f3AoRcxGoLa8AqgNxVvYRZW3eQDYx2AwcFskK5QE=; b=BBOlbdn+k12VLuGu8/txuh3S21OTbNKoNm31YXKz0imPp9mZ+HlpSO67h3crbmMAv5 nRYRH8kj94BoRjnq7orNaS3dhP3HYAGpUVgQvhBwGDzKxjeaQ4363rKBOOJlmD3Csee+ tP8NSOIvTC9KNzfGV8tIQiutBtLsgzdiCFWA1W3LzXt5nd5VuKPJb3RHFtmHc6XuGmZP USJtBZGrgga6b3a0G3qM0QWkukPR0mYpAn2ZKtPUmDzDPPAUsR8DrN3tdkQQKUiBO1eX KQyGRA6ZxUBQwDD6winKqXmLnmd7/p8ZO43A2IEOqs/FWaf6W8HDmLRwfhcRGR8mUlaG 1xNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=Oi8f3AoRcxGoLa8AqgNxVvYRZW3eQDYx2AwcFskK5QE=; b=QEZYA42TAAEKe54LzzLzMRcU4OxilGR7GMtqX/6DQ4RBMaC1ueovDLHlIDiFq1Fcs8 6R4TUkbIaww46ZQNdNUNbckFjtu6/lAajzRoiOC4WVMCYGH4oeHlGx2VWR4jcqlY4RB8 xXi0N7SXXEwYtBDkTQZLBZGkRVxUXxfP5vhh5A/UZpzS+xzjZlkf6xnvGay3R+kYIPMY Hf4St5kl6bcOxhBItP8kgx0Nh7ldXGWCHlrwDKUZ6k1bPDg50oVGZZ6OmWXACD3EqzwE iBAllamgzldGFlVA1kkLYZNKBP5yEiYFj9Z967oNtZPsUutp/Cya0nUYYYSS7KcIYFe3 WIJA== X-Gm-Message-State: APzg51DGy41e0S0Ryt88XGrXX4UgZyVRhSGVOhxx8U+EUVGyegDCQ8dh jFyRRqgiYodGu/S2WDqCmTazv/iy X-Google-Smtp-Source: ANB0VdYKprZurHWGHd/5aa7x0zJDpPnx2dAwXbCPzMAxAz3WxnYvIVdmA6CgPF+WqaiNf02DWsHJlQ== X-Received: by 2002:a62:2483:: with SMTP id k3-v6mr41373058pfk.195.1536159051560; Wed, 05 Sep 2018 07:50:51 -0700 (PDT) Received: from raichu (toroon0560w-lp130-09-70-52-224-239.dsl.bell.ca. [70.52.224.239]) by smtp.gmail.com with ESMTPSA id d22-v6sm8055727pfm.48.2018.09.05.07.50.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Sep 2018 07:50:50 -0700 (PDT) Sender: Mark Johnston Date: Wed, 5 Sep 2018 10:50:45 -0400 From: Mark Johnston To: Subbsd Cc: freebsd-current Current , freebsd-fs@freebsd.org Subject: Re: ZFS perfomance regression in FreeBSD 12 APLHA3->ALPHA4 Message-ID: <20180905145045.GA37268@raichu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Sep 2018 14:50:53 -0000 On Wed, Sep 05, 2018 at 05:04:56PM +0300, Subbsd wrote: > Hi, > > I'm seeing a huge loss in performance ZFS after upgrading FreeBSD 12 > to latest revision (r338466 the moment) and related to ARC. > > I can not say which revision was before except that the newver.sh > pointed to ALPHA3. Could you please try reverting r338416 to see if that fixes the problem? > Problems are observed if you try to limit ARC. In my case: > > vfs.zfs.arc_max="128M" > > I know that this is very small. However, for two years with this there > were no problems. Two years on -CURRENT? How often did you update?