From owner-freebsd-stable@FreeBSD.ORG Fri Mar 18 10:25:25 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 61B361065673 for ; Fri, 18 Mar 2011 10:25:25 +0000 (UTC) (envelope-from srg.gavrilov@gmail.com) Received: from mail-iw0-f182.google.com (mail-iw0-f182.google.com [209.85.214.182]) by mx1.freebsd.org (Postfix) with ESMTP id 2643C8FC08 for ; Fri, 18 Mar 2011 10:25:24 +0000 (UTC) Received: by iwn33 with SMTP id 33so4498780iwn.13 for ; Fri, 18 Mar 2011 03:25:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=NO41XoO6gpCCOFt0/ruvQaBV/ICpI5lzmp5Wy94Pll8=; b=U5k9e3k5AGJ9AWHzEB1y7MEJoR68qbGdi0B90KdBmO63QzMLrJrrHxij1r5XaAVwhD ZIxYhCdotgXRqHZJ+Wy5EllYb1JkI4x+LQFNWREOYwOxNUt4XDXOtEWO47HBp0sVID9q 4qEUazJMDfZ2aQujL3UsfwFG1S0VLaL8I0Ja0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=qLF5gzmdcJjAqqxPZOemTRHai3Fy82VoPqBl7AR0xM/EZOtFfGCef5zu7NwXc+hlWX cLxeUTyOqCWRuP1hClOW4wMn1pL3uYXLyB3dAeYXTCiWlCDqO5Cgt6uW5PINS5FIFUNo jKF01s0rPNx2RmZ7w5RYs8A6L4w13RvpL9tvI= MIME-Version: 1.0 Received: by 10.43.69.7 with SMTP id ya7mr1175940icb.364.1300442037672; Fri, 18 Mar 2011 02:53:57 -0700 (PDT) Received: by 10.42.217.66 with HTTP; Fri, 18 Mar 2011 02:53:57 -0700 (PDT) In-Reply-To: <20110224075517.GA18146@icarus.home.lan> References: <4D660909.6090202@my.gd> <20110224075517.GA18146@icarus.home.lan> Date: Fri, 18 Mar 2011 12:53:57 +0300 Message-ID: From: Sergey Gavrilov To: Jeremy Chadwick Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: "freebsd-stable@freebsd.org" Subject: Re: ZFS - abysmal performance with samba since upgrade to 8.2-RELEASE X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Mar 2011 10:25:25 -0000 vfs.zfs.prefetch_disable="1" causes much slow read on sequence data in my case. with vfs.zfs.prefetch_disable="1": dd if=/pool1/test/idisk1 of=/dev/null bs=1m count=500 524288000 bytes transferred in 18.347177 secs (28575949 bytes/sec) with vfs.zfs.prefetch_disable="0": dd if=/pool1/test/idisk1 of=/dev/null bs=1m count=500 524288000 bytes transferred in 3.331806 secs (157358504 bytes/sec) after few seconds: dd if=/pool1/test/idisk1 of=/dev/null bs=1m count=500 524288000 bytes transferred in 0.107767 secs (4865009592 bytes/sec) My system: FreeBSD 8.2-RELEASE hw.machine: amd64 hw.model: Intel(R) Xeon(R) CPU E5520 @ 2.27GHz hw.ncpu: 8 hw.physmem: 17155719168 3ware 9690sa controller Disks: ST32000445SS pool: pool1 NAME STATE READ WRITE CKSUM pool1 ONLINE 0 0 0 raidz2 ONLINE 0 0 0 da12 ONLINE 0 0 0 da11 ONLINE 0 0 0 da10 ONLINE 0 0 0 da9 ONLINE 0 0 0 da16 ONLINE 0 0 0 da15 ONLINE 0 0 0 da14 ONLINE 0 0 0 da13 ONLINE 0 0 0 -- Best regards, Sergey Gavrilov