From owner-freebsd-questions@FreeBSD.ORG Thu Jan 17 15:15:02 2013 Return-Path: Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 3495F2EB for ; Thu, 17 Jan 2013 15:15:02 +0000 (UTC) (envelope-from lists@eitanadler.com) Received: from mail-la0-f42.google.com (mail-la0-f42.google.com [209.85.215.42]) by mx1.freebsd.org (Postfix) with ESMTP id B417570F for ; Thu, 17 Jan 2013 15:15:01 +0000 (UTC) Received: by mail-la0-f42.google.com with SMTP id fe20so2790517lab.29 for ; Thu, 17 Jan 2013 07:15:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=eitanadler.com; s=0xdeadbeef; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=A60jaZpkCyxMj403Ssu6y+fonjnx+RFKeogo2G8BO0E=; b=DljLJ643ZkkBsbF8VaTM+SHP4ATe5DZeOboOsCSxj04w6bmHitu58HsOcFMJIzqacS FnVdMP650cMU6PPV/oQ2Oa+LO36qwZn4XOmshxJc3JcQqMEZQOeMvEcfITjXJERFGiKv tjBMvGUdbhFgJfPLwg0HVpWfICqtcP13VaB8g= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:x-gm-message-state; bh=A60jaZpkCyxMj403Ssu6y+fonjnx+RFKeogo2G8BO0E=; b=aCQiWRPI87AwehK+UM47dkcHF7IQvusbocBX8EqQtClD16mDXnfiKIWp2ywSpRphpb XP8gq2BSzi236xreh8w3Y+CJniQSZtoOHDgtJOU5scquN1UnuKkB+/Hvf0CuVnjg1bHb P1M1K/E01IVNZpU9BTnudMemD1YVLfXShdUoLDzlKPOuRXW4T0xzlfeKFOTk3STwgVDF NAjNki4XXiYQU/KrXy9Pjolj0kI3AxW2gn3E2cKt0YWf86BzyWKX1TwBDHQWCkOq+czm DX9mlFKiiaa5mSELdRhYo0Hdd8ELP9edpASEF7rJvdVoFG0qfijne7dbqtdigkGM9BCa k9YA== X-Received: by 10.112.82.136 with SMTP id i8mr2327683lby.74.1358435700253; Thu, 17 Jan 2013 07:15:00 -0800 (PST) MIME-Version: 1.0 Received: by 10.112.30.131 with HTTP; Thu, 17 Jan 2013 07:14:30 -0800 (PST) In-Reply-To: <20130117135241.434f273a@fabiankeil.de> References: <20130117135241.434f273a@fabiankeil.de> From: Eitan Adler Date: Thu, 17 Jan 2013 10:14:30 -0500 Message-ID: Subject: Re: absurd I/O perf with ZFS: hangs on zfs->cv) To: Fabian Keil Content-Type: text/plain; charset=UTF-8 X-Gm-Message-State: ALoCoQmhAS9NF+lhizS5YeBmBCbz88HtNKSQ9hup3YfGgbOvtesqOXcrc431UxegSLbNLp+xTdKf Cc: questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jan 2013 15:15:02 -0000 On 17 January 2013 07:52, Fabian Keil wrote: > Eitan Adler wrote: > I don't think there are any laptops with "large amounts of RAM" > as far as ZFS is concerned. Haha okay: 8GB of RAM. >> It is taking me 45 minutes to make 5 commits to git. Something is >> wrong here but I have no idea what I should be looking at. Any ideas? > > Try sysutils/zfs-stats to get a rough idea of how ZFS is using > the available memory. Anything in particular I should be looking for? > If you already followed tuning advice from the Internet without > benchmarking it, try reverting it. I have done absolutely no tuning. Is there anything in particular I *should* tune? > Once you have gathered some more information it might make sense > to ask again on freebsd-fs@. Ack. > On a new system it's probably not an issue, but the recommendation > is to keep around 20% of the pool free to keep the performance up. Good to know. I will be careful here. -- Eitan Adler