From owner-freebsd-fs@FreeBSD.ORG Fri Mar 15 14:58:58 2013 Return-Path: Delivered-To: freebsd-fs@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 128DF921; Fri, 15 Mar 2013 14:58:58 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from mail-qa0-f48.google.com (mail-qa0-f48.google.com [209.85.216.48]) by mx1.freebsd.org (Postfix) with ESMTP id B4C0275D; Fri, 15 Mar 2013 14:58:57 +0000 (UTC) Received: by mail-qa0-f48.google.com with SMTP id j8so336636qah.0 for ; Fri, 15 Mar 2013 07:58:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=qkDuTVQJ6xqFXDMQGdzSS6hRckvP99eSBCbNyltoeoc=; b=WlOM50D7ZgsjK2u0UpZOHzNPDZutSZNir/iL8rVtDFYeBkMrCLmNDG89kOpMSc2BLt 0VA+gQ7wEInUZdR1RvEs3OoOlxhOhdQXnAIpk0baTWSDrvneMMOENENvCdA4cqkLl+a0 g8JxeuIYseV0CvtNyPsCTfqmmj1R6t1weFhtvMi6RH6XBrFBIo2uKLMDaJxrQmMgJ+4q u0C5zAo7athMplD69T3rHZTa7IxgwgYEQX3/ypbX1FZtPv5IKBEhK1oCrjySiV000Sez b332v3Gvgh0rseheluJvy0uc1pZP0jvdn1MCZ4gUibC+m5FzP04q0lALsoa7lta0o0y1 CWVA== MIME-Version: 1.0 X-Received: by 10.49.128.170 with SMTP id np10mr6042926qeb.37.1363359531070; Fri, 15 Mar 2013 07:58:51 -0700 (PDT) Received: by 10.49.50.67 with HTTP; Fri, 15 Mar 2013 07:58:50 -0700 (PDT) In-Reply-To: <51430744.6020004@FreeBSD.org> References: <51430744.6020004@FreeBSD.org> Date: Fri, 15 Mar 2013 07:58:50 -0700 Message-ID: Subject: Re: Strange slowdown when cache devices enabled in ZFS From: Freddie Cash To: Andriy Gapon Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 Cc: FreeBSD Filesystems X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Mar 2013 14:58:58 -0000 How does one do that? I've never done that before. Point me to some docs, and I'll see what I can find out. On Fri, Mar 15, 2013 at 4:34 AM, Andriy Gapon wrote: > on 14/03/2013 20:13 Freddie Cash said the following: > > the l2arc_feed_thread of zfskern will spin until it takes up 100% > > of a CPU core > > If you see a thread taking 100% where it shouldn't, then just profile it > and > actually see what it's doing. > > -- > Andriy Gapon > -- Freddie Cash fjwcash@gmail.com