From owner-freebsd-current Sun Jul 26 09:49:10 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA08774 for freebsd-current-outgoing; Sun, 26 Jul 1998 09:49:10 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from antipodes.cdrom.com (castles247.castles.com [208.214.165.247]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id JAA08769 for ; Sun, 26 Jul 1998 09:49:08 -0700 (PDT) (envelope-from mike@antipodes.cdrom.com) Received: from antipodes.cdrom.com (localhost [127.0.0.1]) by antipodes.cdrom.com (8.8.8/8.8.5) with ESMTP id JAA10667; Sun, 26 Jul 1998 09:47:55 -0700 (PDT) Message-Id: <199807261647.JAA10667@antipodes.cdrom.com> X-Mailer: exmh version 2.0zeta 7/24/97 To: Karl Denninger cc: Garrett Wollman , Dan Swartzendruber , current@FreeBSD.ORG Subject: Re: MMAP problems In-reply-to: Your message of "Sun, 26 Jul 1998 09:50:49 CDT." <19980726095049.51700@mcs.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sun, 26 Jul 1998 09:47:54 -0700 From: Mike Smith Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > And I can confirm that the trash IS being written to disk; its definitely > there on stable storage when you go look for it later. > > The data which gets written is usually a block of zeros, but it may not be; > it can also be random trash. Its also not always one block (it could be > more than one), but it IS always, at least from what I'm seeing here, a > multiple of 512 bytes (disk blocksize). The significant question in light of Garrett's description seem to be whether the trash that's written is actually being written by the process in error because that's what it got from a previous read, or whether the process is actually writing the right stuff and it's being corrupted on the way down. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message