From owner-freebsd-fs@FreeBSD.ORG Mon Apr 2 18:39:17 2012 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 D17D3106564A for ; Mon, 2 Apr 2012 18:39:17 +0000 (UTC) (envelope-from pluknet@gmail.com) Received: from mail-bk0-f54.google.com (mail-bk0-f54.google.com [209.85.214.54]) by mx1.freebsd.org (Postfix) with ESMTP id 5A1FC8FC15 for ; Mon, 2 Apr 2012 18:39:16 +0000 (UTC) Received: by bkcjc3 with SMTP id jc3so3288082bkc.13 for ; Mon, 02 Apr 2012 11:39:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=512xPBAzFpdYM68HMk0/ZeVvPXRhClN7/bnXu+zTh5M=; b=GkX4TjqwtHVfHibYJYendsbOCJW8LfQUpZpblSMARKHJvZuHqOH/KzihJev+VS5sTS V65edd8Z/rirc2s7oPAM6XQ5wgyPIcuJ5nsJgZnDyzKCVUbESlIke3SrNtUXgadKA3E9 MWPgM9wIYuv4BT2Cn3YdAnIv527Of8/fsbtHzqWaRtYTLB5iQG/QnleLLw+RcWzzxyis qMP7RVSp2jgAo9s1BpD8wRWooLRRYFj7fyJPkQUFmxBzGEh1zIEmbAmj1V3NI6SspBr0 JKDajlwpUh2NanQQwrC28E7EMOShuGlg59Wk8XHrG2C3kjaHtqTmPMopWSopqDXgf7BK lbZw== MIME-Version: 1.0 Received: by 10.152.129.69 with SMTP id nu5mr10877751lab.9.1333391955779; Mon, 02 Apr 2012 11:39:15 -0700 (PDT) Received: by 10.152.25.69 with HTTP; Mon, 2 Apr 2012 11:39:15 -0700 (PDT) In-Reply-To: References: Date: Mon, 2 Apr 2012 22:39:15 +0400 Message-ID: From: Sergey Kandaurov To: "bsalinux@gmail.com" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org Subject: Re: Swap on ZFS / swap_pager: indefinite wait buffer 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: Mon, 02 Apr 2012 18:39:17 -0000 On 2 April 2012 22:13, bsalinux@gmail.com wrote: > Hi, > > I have been running FreeBSD 9.0-RELEASE from a USB stick running ZFS. > I have created swap file on zfs volume using the md driver. > > Swapinfo shows > > Device =A0 =A0 =A0 =A0 =A01K-blocks =A0 =A0 Used =A0 =A0Avail Capacity > /dev/md0 =A0 =A0 =A0 =A0 =A04194304 =A0 =A0 =A0 =A00 =A04194304 =A0 =A0 0= % > > > The system has hung twice and all I can find in the log is > > Mar 22 03:17:30 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 927, size: 4096 > Mar 23 09:00:26 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 55, size: 4096 > Mar 23 22:01:26 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 49, size: 4096 > Mar 24 04:00:38 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 60, size: 4096 > That generally means that your storage is too slow (to handle swap). See also FAQ: http://www.freebsd.org/doc/en/books/faq/troubleshoot.html#INDEFINITE-WAIT-B= UFFER > As the swap is on zfs, I assume it is not failing. > > Do I need to move swap off of ZFS? > IIRC swap on ZFS is generally a bad idea. Search web for bad stories. --=20 wbr, pluknet