From owner-freebsd-fs@FreeBSD.ORG Sat Mar 28 12:58:30 2015 Return-Path: Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 6C1A11F5; Sat, 28 Mar 2015 12:58:30 +0000 (UTC) Received: from puchar.net (puchar.net [188.252.31.250]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "puchar.net", Issuer "puchar.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id E5812FA5; Sat, 28 Mar 2015 12:58:29 +0000 (UTC) Received: Received: from 127.0.0.1 (localhost [127.0.0.1]) by puchar.net (8.14.9/8.14.9) with ESMTP id t2SCwIfu082572 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 28 Mar 2015 13:58:19 +0100 (CET) (envelope-from wojtek@puchar.net) Received: from laptop.wojtek.intra (localhost [127.0.0.1]) by laptop.wojtek.intra (8.14.9/8.14.9) with ESMTP id t2SCwEfB000824; Sat, 28 Mar 2015 13:58:14 +0100 (CET) (envelope-from wojtek@puchar.net) Received: from localhost (wojtek@localhost) by laptop.wojtek.intra (8.14.9/8.14.9/Submit) with ESMTP id t2SCw9VZ000821; Sat, 28 Mar 2015 13:58:09 +0100 (CET) (envelope-from wojtek@puchar.net) X-Authentication-Warning: laptop.wojtek.intra: wojtek owned process doing -bs Date: Sat, 28 Mar 2015 13:58:09 +0100 (CET) From: Wojciech Puchar X-X-Sender: wojtek@laptop.wojtek.intra To: Alexander Motin Subject: Re: MAXBSIZE increase In-Reply-To: <5515C421.4040703@FreeBSD.org> Message-ID: References: <5515C421.4040703@FreeBSD.org> User-Agent: Alpine 2.20 (BSF 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (puchar.net [10.0.1.1]); Sat, 28 Mar 2015 13:58:20 +0100 (CET) Cc: freebsd-fs@FreeBSD.org, "freebsd-hackers@freebsd.org" X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 Mar 2015 12:58:30 -0000 i routinely put options MAXPHYS=2097152 on my servers. no problems, except MUCH enhanced performance on large files. with UFS. SOME SSDs (few) doesn't work properly with >1MB requests. no idea about ZFS. with NFS do not ever expect good performance with it's sync mode. if you like to take a risk add vfs.nfsd.async=1 to sysctl.conf unless your NFS clients depend on forced syncs, the risk is actually no higher that running normal UFS filesystem locally. And performance is excellent.