From owner-freebsd-fs@freebsd.org Mon Sep 3 12:41:47 2018 Return-Path: Delivered-To: freebsd-fs@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 8D4FDFE89A8 for ; Mon, 3 Sep 2018 12:41:47 +0000 (UTC) (envelope-from rainer@ultra-secure.de) Received: from connect.ultra-secure.de (connect.ultra-secure.de [88.198.71.201]) by mx1.freebsd.org (Postfix) with ESMTP id F05CD83181 for ; Mon, 3 Sep 2018 12:41:46 +0000 (UTC) (envelope-from rainer@ultra-secure.de) Received: (Haraka outbound); Mon, 03 Sep 2018 14:41:40 +0200 Authentication-Results: connect.ultra-secure.de; auth=pass (login); spf=none smtp.mailfrom=ultra-secure.de Received-SPF: None (connect.ultra-secure.de: domain of ultra-secure.de does not designate 127.0.0.10 as permitted sender) receiver=connect.ultra-secure.de; identity=mailfrom; client-ip=127.0.0.10; helo=connect.ultra-secure.de; envelope-from= Received: from connect.ultra-secure.de (webmail [127.0.0.10]) by connect.ultra-secure.de (Haraka/2.6.2-toaster) with ESMTPSA id BE4B16C7-89D8-4C17-A64A-C7ACA9E1B16F.1 envelope-from (authenticated bits=0) (version=TLSv1/SSLv3 cipher=AES256-SHA verify=NO); Mon, 03 Sep 2018 14:41:33 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Mon, 03 Sep 2018 14:41:33 +0200 From: rainer@ultra-secure.de To: Yamagi Burmeister Cc: freebsd-fs@freebsd.org Subject: Re: ZFS (ARC) performance regression in r321610 In-Reply-To: <20180829131940.7ca6ccb23035eee6808119fb@yamagi.org> References: <20180827154727.80f92fff9bbc931b37928d43@yamagi.org> <3c6f8c96-6ac9-7257-c8c0-8be2063a7c19@FreeBSD.org> <1c816966fbe698f0497df231139f9a05@ultra-secure.de> <20180829131940.7ca6ccb23035eee6808119fb@yamagi.org> Message-ID: <4e47ba5c44767368fc01b9692a154b0c@ultra-secure.de> X-Sender: rainer@ultra-secure.de User-Agent: Roundcube Webmail/1.2.0 X-Haraka-GeoIP: --, , NaNkm X-Haraka-GeoIP-Received: X-Haraka-p0f: os="undefined undefined" link_type="undefined" distance=undefined total_conn=undefined shared_ip=Y X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on spamassassin X-Spam-Level: X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham autolearn_force=no version=3.4.1 X-Haraka-Karma: score: 6, good: 689, bad: 0, connections: 695, history: 689, pass:all_good, relaying X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Sep 2018 12:41:47 -0000 Am 2018-08-29 13:19, schrieb Yamagi Burmeister: > Hi, > my patch was committed this morning. If you're on 12-CURRENT you can > just set vfs.zfs.abd_scatter_enabled to 0. On other branches the > easiest way to make the change permanent is to edit > sys/cddl/contrib/opensolaris/uts/common/fszfs/abd.c and change > zfs_abd_scatter_enabled (on 11.2 it's in line 141) from B_TRUE to > B_FALSE. Then rebuild the kernel, reboot and you're done. Hi, thanks a lot. It's just that none of my machines have sources. The last time I actually compiled a kernel was for https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594 IIRC. It's not that I don't know how to do it (I started with FreeBSD 2.2.x). The problem is also that I have to ask for downtime for each reboot or just restart of mysql on those servers and it can only be done after 10pm. And it takes the f'ing HP server 10m to be back at the login-prompt. But I'll look into it. The servers are on 11.2. Best Regards, Rainer