From owner-freebsd-stable@FreeBSD.ORG Mon Nov 15 21:13:43 2010 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 440A8106564A for ; Mon, 15 Nov 2010 21:13:43 +0000 (UTC) (envelope-from christer.solskogen@gmail.com) Received: from mail-yx0-f182.google.com (mail-yx0-f182.google.com [209.85.213.182]) by mx1.freebsd.org (Postfix) with ESMTP id F355D8FC1C for ; Mon, 15 Nov 2010 21:13:42 +0000 (UTC) Received: by yxh35 with SMTP id 35so51858yxh.13 for ; Mon, 15 Nov 2010 13:13:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:date:message-id :subject:from:to:content-type; bh=R7ZSUi8p4tPBmtmpLtvPuB57ro34ayTFz5Fh8DpciJk=; b=X3Ax5Y5FSLEhKAZtWIMkucoAQDfZIphn0XfHDw/NM317G0tBAROv5yBBmPN8wk5/qn vmH2OG4uOqm9hqDZec9rzJy1jTxajHWZu3Da9/987mfKOimCPG0hICEw1C8wh9EW4v+0 vhM0WKkjU1eyHi6GlSAVePBtvUNL5uVqS4QnA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=iYMLddg7qt2UKpJHwjZJTMk65faZqSUb45s5nlwknaqHgA671q6+cQtBuATdU6Hikf GEC94pJHge+LxTlLjGEczgPavig3lBkAzEWZd37NSor4oQaEJj5wXAj2qOCldfUCdyGf pFIl7X9QjVWe8TaSXnlgeBJhbAvcnRVL8/Yqg= MIME-Version: 1.0 Received: by 10.229.91.194 with SMTP id o2mr5454608qcm.250.1289854256457; Mon, 15 Nov 2010 12:50:56 -0800 (PST) Received: by 10.229.231.81 with HTTP; Mon, 15 Nov 2010 12:50:50 -0800 (PST) Date: Mon, 15 Nov 2010 21:50:50 +0100 Message-ID: From: Christer Solskogen To: FreeBSD Stable Content-Type: text/plain; charset=ISO-8859-1 Subject: "High" cpu usage when using ZFS cache device 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: Mon, 15 Nov 2010 21:13:43 -0000 My load on my i7 920 is certainly higher when I add a 8GB usb stick as a ZFS cache device. It seems to use about 10% system load - If I remove the cache device it drops about 10%. Anyone else seeing this? With cache device: CPU: 0.0% user, 0.0% nice, 10.3% system, 0.0% interrupt, 91.5% idle Mem: 822M Active, 9101M Inact, 1542M Wired, 34M Cache, 1237M Buf, 375M Free Swap: 8192M Total, 200K Used, 8192M Free Without: up 56+01:04:25 21:50:01 137 processes: 1 running, 136 sleeping CPU: 0.1% user, 0.0% nice, 0.0% system, 0.0% interrupt, 99.9% idle Mem: 822M Active, 9101M Inact, 1542M Wired, 34M Cache, 1237M Buf, 375M Free The load reported by top is +0.50 with, and +0.00 without. FreeBSD 8.1-RELEASE amd64 -- chs,