From owner-freebsd-questions@FreeBSD.ORG Wed Dec 1 23:35:54 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 84FD91065672 for ; Wed, 1 Dec 2010 23:35:54 +0000 (UTC) (envelope-from materribile@yahoo.com) Received: from nm21.bullet.mail.sp2.yahoo.com (nm21.bullet.mail.sp2.yahoo.com [98.139.91.91]) by mx1.freebsd.org (Postfix) with SMTP id 60B848FC20 for ; Wed, 1 Dec 2010 23:35:54 +0000 (UTC) Received: from [98.139.91.61] by nm21.bullet.mail.sp2.yahoo.com with NNFMP; 01 Dec 2010 23:23:11 -0000 Received: from [98.139.91.36] by tm1.bullet.mail.sp2.yahoo.com with NNFMP; 01 Dec 2010 23:23:11 -0000 Received: from [127.0.0.1] by omp1036.mail.sp2.yahoo.com with NNFMP; 01 Dec 2010 23:23:11 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 903944.88103.bm@omp1036.mail.sp2.yahoo.com Received: (qmail 99148 invoked by uid 60001); 1 Dec 2010 23:23:11 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1291245791; bh=Wpn58X3PZJct2NNpqal3/g0QnF/N2nxQ4e7Ym6NAf9A=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=w5GR7BiuZ10D912qIjbVNrsGBqH6Q0SYjHWiTWUUYiIMVmPGk+Tcmv4Min5FSaVqBMdVX4O7p1xLIDFsqxUGVRBksRzZVqt3PuMVCjqWroQlfIFRrnHzHt6UTn31UZXELsAPxr/TdzeWAsKKOgUJQRffvt1GWw5/IUmrDm4nf8U= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=KTs40KhBh7MhIJv3ZvZ9CEsBtFPLEi5DFStM0m80D3tzkz2fl66Ti6EE23ABjhP77Zvj6ZcxcfstxXEFYb+DhrJ+eKWZaBWldyrFWHrwi43MCkjnc60gDl5pRUZOy7xZ5Q3WRMqLuGgzQweWfuQsnVltX9QLpJM4cVFNHH4oZOE=; Message-ID: <552239.98378.qm@web110303.mail.gq1.yahoo.com> X-YMail-OSG: __2zxkQVM1kT_d_3HZyhmnie0xr1rCqL.agatZ7Y_SPSj7K 8ZAkwFIi5cYVd_4xH1hFPeUY.OrGkcYTfL57l9AQs_Q_zEBTCUmSinL_45kM LxY7YebL5dX6AjjDLB80IYn4b_30QRRHb1i9RZIY50FSe2bFUAy9Jm.lV_fe 16RxJMJ2XRlZpwzFoKSnbeoyWxkmUfFuZM2bSfBeKzKgjWzUZG9u_T7fUgbo 3NjRmoa6mqD4hVodJ2ekchNYV2PqocqVBEe_WCPVwVZErOF8cSTxhGLOxU4n f3DPM8ynh1WJ4q1sOrr3ssPfCy_143w5KY2RCs1YheS5SE9M8wb4Ggiyx1Ia E1uwbtHas5QcpNh7FBzCn3uBe6syDK7TchbKI9H.P48gP9A-- Received: from [24.228.57.153] by web110303.mail.gq1.yahoo.com via HTTP; Wed, 01 Dec 2010 15:23:10 PST X-Mailer: YahooMailClassic/11.4.20 YahooMailWebService/0.8.107.285259 Date: Wed, 1 Dec 2010 15:23:10 -0800 (PST) From: Mark Terribile To: freebsd-questions@freebsd.org In-Reply-To: <20101130120032.B79B010656A4@hub.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Subject: swap pager:indefinite wait buffer: message out of vm.c X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Dec 2010 23:35:54 -0000 Hi, Would some kind soul please tell me the meaning of a message coming from vm.c (FreeBSD 7.2): "swap pager: indefinite wait buffer: bufobj: 0, blkno: 2, size: 4096" This message occurs after a return from an msleep whose last args are PSWP, "swread", and HZ*20 . When it occurs, some interactive program is locked up. It recovers sometime later. My best guess is that this is a complaint that swap or paging I/O has been excessively delayed. It is occurring while I am running disk-to-disk transfers that have deep buffering. Think mbuf(1), but it's my own code, testing some algorithms. I speculate that if the disk queuing/head movement optimization doesn't let the heads move off the file system where the file resides (and I only see this with large, single files) then this problem might result. But that is a guess, and speculation. Does anyone know if this can occur under later versions of FreeBSD? Thank you for your help. Mark Terribile materribile@yahoo.com