From owner-freebsd-fs@FreeBSD.ORG Thu Oct 15 23:32:42 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5069C1065672 for ; Thu, 15 Oct 2009 23:32:42 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4]) by mx1.freebsd.org (Postfix) with ESMTP id 10CAD8FC13 for ; Thu, 15 Oct 2009 23:32:41 +0000 (UTC) Received: from localhost (localhost.codelab.cz [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id D4BCB19E027; Fri, 16 Oct 2009 01:32:40 +0200 (CEST) Received: from [192.168.1.2] (r5bb235.net.upc.cz [86.49.61.235]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by elsa.codelab.cz (Postfix) with ESMTPSA id 919F319E019; Fri, 16 Oct 2009 01:32:38 +0200 (CEST) Message-ID: <4AD7B115.2080104@quip.cz> Date: Fri, 16 Oct 2009 01:32:37 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.12) Gecko/20050915 X-Accept-Language: cz, cs, en, en-us MIME-Version: 1.0 To: grarpamp References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-fs@freebsd.org Subject: Re: ZFS threads? X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Oct 2009 23:32:42 -0000 grarpamp wrote: > I don't know about reducing them directly, > maybe vfs.zfs.zfetch.max_streams. On mine > it's 8 which might be that 0 through 7 you see. > > This system has 9 zfs mountpoints and > 104 spa_zio* threads. So you might try > cutting mountpoints if possible. I don't know how it is related, but I have system with 17 ZFS mountpoints and just 25 spa_zio threads (named as spa_zio_issue_2, spa_zio_intr_2 etc). This is on 7.2-RELEASE-p2 amd64 Miroslav Lachman