From owner-freebsd-current@FreeBSD.ORG Tue Mar 21 19:49:05 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A7CD616A420; Tue, 21 Mar 2006 19:49:05 +0000 (UTC) (envelope-from kris@obsecurity.org) Received: from elvis.mu.org (elvis.mu.org [192.203.228.196]) by mx1.FreeBSD.org (Postfix) with ESMTP id 01AC943D5C; Tue, 21 Mar 2006 19:49:05 +0000 (GMT) (envelope-from kris@obsecurity.org) Received: from obsecurity.dyndns.org (elvis.mu.org [192.203.228.196]) by elvis.mu.org (Postfix) with ESMTP id DF2421A4DD1; Tue, 21 Mar 2006 11:49:04 -0800 (PST) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id 539FF515BE; Tue, 21 Mar 2006 14:49:04 -0500 (EST) Date: Tue, 21 Mar 2006 14:49:04 -0500 From: Kris Kennaway To: John Kozubik Message-ID: <20060321194904.GA20959@xor.obsecurity.org> References: <20060320224313.O55763@kozubik.com> <20060321184127.GA19204@xor.obsecurity.org> <20060321113923.I55763@kozubik.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="cWoXeonUoKmBZSoM" Content-Disposition: inline In-Reply-To: <20060321113923.I55763@kozubik.com> User-Agent: Mutt/1.4.2.1i Cc: freebsd-fs@freebsd.org, jroberson@chesapeake.net, freebsd-current@freebsd.org, tegge@freebsd.org, Kris Kennaway Subject: Re: UFS2 Snapshots in 6.1-Beta4 - Confirmed Problems X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Mar 2006 19:49:05 -0000 --cWoXeonUoKmBZSoM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 21, 2006 at 11:40:44AM -0800, John Kozubik wrote: >=20 >=20 > On Tue, 21 Mar 2006, Kris Kennaway wrote: >=20 > > > This next one is complicated, and I haven't submitted a PR for it yet= , but > > > I believe it is quite serious for reasons I will expand on below. > > > > > > The problem is: If you completely fill a filesystem (109% usage in `= df` > > > on most systems) that has a snapshot on it, the system becomes very > > > unresponsive - all interactive and disk response lags terribly and, > > > although the system is not hung, it is in many cases unusable. > > > > Yes :-( This will probably not be fixable in time for 6.1, but > > hopefully it will be addressed in the future. FYI, the system may > > also panic in this situation. >=20 >=20 > Because my original description of this behavior was so vague, I was going > to try to reproduce it again with more details, however it sounds like you > have already witnessed this and know more about it than I do. >=20 > Is that true ? Can I skip a few hours of trying to reproduce this ? Yes, I'm easily able to reproduce it, and I'm told that fixing it will require fairly extensive work & testing. Kris --cWoXeonUoKmBZSoM Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQFEIFivWry0BWjoQKURAhtMAKCPf9EejvGpZ1a3nl2ou2dkEQCeKgCgzswY zBBpyed8lGzCvRrzD0aDltg= =fHvo -----END PGP SIGNATURE----- --cWoXeonUoKmBZSoM--