From nobody@FreeBSD.org Tue Apr 13 09:07:45 2004 Return-Path: Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 67F6F16A4CE for ; Tue, 13 Apr 2004 09:07:45 -0700 (PDT) Received: from www.freebsd.org (www.freebsd.org [216.136.204.117]) by mx1.FreeBSD.org (Postfix) with ESMTP id 623F243D5D for ; Tue, 13 Apr 2004 09:07:45 -0700 (PDT) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.12.10/8.12.10) with ESMTP id i3DG7j72078919 for ; Tue, 13 Apr 2004 09:07:45 -0700 (PDT) (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.12.10/8.12.10/Submit) id i3DG7jtw078918; Tue, 13 Apr 2004 09:07:45 -0700 (PDT) (envelope-from nobody) Message-Id: <200404131607.i3DG7jtw078918@www.freebsd.org> Date: Tue, 13 Apr 2004 09:07:45 -0700 (PDT) From: Sheshka Alexey To: freebsd-gnats-submit@FreeBSD.org Subject: dd bs size _MUST_ be N*512 - bug or feature X-Send-Pr-Version: www-2.3 >Number: 65494 >Category: misc >Synopsis: dd bs size _MUST_ be N*512 - bug or feature >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: closed >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Apr 13 09:10:20 PDT 2004 >Closed-Date: Sat Apr 24 00:43:06 PDT 2004 >Last-Modified: Sat Apr 24 00:43:06 PDT 2004 >Originator: Sheshka Alexey >Release: 5.2.1 >Organization: >Environment: FreeBSD service.extmedia.com 5.2.1-RELEASE-p4 FreeBSD 5.2.1-RELEASE-p4 #0: Mon Apr 5 04:54:55 EEST 2004 root@service.extmedia.com:/usr/obj/usr/src/sys/SERVICE i386 >Description: While I'm making root@service.extmedia.com [~] # dd if=/dev/ad0 of=/dev/null bs=1000 count=10 dd: /dev/ad0: Invalid argument 0+0 records in 0+0 records out 0 bytes transferred in 0.000544 secs (0 bytes/sec) it produse error, but root@service.extmedia.com [~] # dd if=/dev/ad0 of=/dev/null bs=4096 count=10 10+0 records in 10+0 records out 40960 bytes transferred in 0.013014 secs (3147361 bytes/sec) all good. On OpenBSD and Linux all woks fine with _ANY_ value of bs ... Is it bug or feature in FreeBSD ? If it is feature , I think this information must presents on it. >How-To-Repeat: dd if=/dev/ad0 of=/dev/null bs=1000 count=10 >Fix: >Release-Note: >Audit-Trail: From: Kris Kennaway To: Sheshka Alexey Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: misc/65494: dd bs size _MUST_ be N*512 - bug or feature Date: Fri, 16 Apr 2004 01:49:29 -0700 --6c2NcOVqGQ03X4Wi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Apr 13, 2004 at 09:07:45AM -0700, Sheshka Alexey wrote: > While I'm making=20 > root@service.extmedia.com [~] # dd if=3D/dev/ad0 of=3D/dev/null bs=3D1000= count=3D10 > dd: /dev/ad0: Invalid argument > 0+0 records in > 0+0 records out > 0 bytes transferred in 0.000544 secs (0 bytes/sec) > it produse error, but > root@service.extmedia.com [~] # dd if=3D/dev/ad0 of=3D/dev/null bs=3D4096= count=3D10 > 10+0 records in > 10+0 records out > 40960 bytes transferred in 0.013014 secs (3147361 bytes/sec) > all good. >=20 > On OpenBSD and Linux all woks fine with _ANY_ value of bs ... Is it bug o= r feature in FreeBSD ? > If it is feature , I think this information must presents on it. > >How-To-Repeat: > dd if=3D/dev/ad0 of=3D/dev/null bs=3D1000 count=3D10 Feature, I think - you have to use a multiple of the block size of the underlying device, because FreeBSD no longer implements buffered devices. Kris --6c2NcOVqGQ03X4Wi Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAf54ZWry0BWjoQKURAuI6AKCYc0/g/He6JLgkfvqb2lEfPrD9HQCgte0F Xs24sPaq5cG4MBSMBqjPmRA= =ylMn -----END PGP SIGNATURE----- --6c2NcOVqGQ03X4Wi-- State-Changed-From-To: open->closed State-Changed-By: kris State-Changed-When: Sat Apr 24 00:42:48 PDT 2004 State-Changed-Why: Not a bug http://www.freebsd.org/cgi/query-pr.cgi?pr=65494 >Unformatted: