From owner-freebsd-current@FreeBSD.ORG Fri Apr 17 09:49:30 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5FCB5106566B for ; Fri, 17 Apr 2009 09:49:30 +0000 (UTC) (envelope-from peter.schuller@infidyne.com) Received: from hyperion.scode.org (cl-1361.ams-04.nl.sixxs.net [IPv6:2001:960:2:550::2]) by mx1.freebsd.org (Postfix) with ESMTP id 1A3758FC12 for ; Fri, 17 Apr 2009 09:49:30 +0000 (UTC) (envelope-from peter.schuller@infidyne.com) Received: from hyperion.scode.org (hyperion.scode.org [85.17.42.115]) by hyperion.scode.org (Postfix) with ESMTPS id 20FAB23C42F; Fri, 17 Apr 2009 11:49:29 +0200 (CEST) Date: Fri, 17 Apr 2009 11:49:28 +0200 From: Peter Schuller To: Ben Kelly Message-ID: <20090417094927.GA38912@hyperion.scode.org> References: <49C2CFF6.8070608@egr.msu.edu> <08D7DC2A-68BE-47B6-8D5D-5DE6B48F87E5@wanderview.com> <20090416132302.GA86096@hyperion.scode.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="tKW2IUtsqtDRztdT" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.19 (2009-01-05) Cc: freebsd-current@freebsd.org, Artem Belevich Subject: Re: [patch] zfs livelock and thread priorities 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: Fri, 17 Apr 2009 09:49:30 -0000 --tKW2IUtsqtDRztdT Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > I find it odd that they would pause for up to 5 seconds, though. I =20 > would expect the throttling to occur over a much smaller time span. =20 > Do you see similarly large pauses in disk I/O during a scrub? It was 1 second bursts, one per 5 second transaction commit period yes. My memory is too fuzzy on the details, but it was consistent with my interpretation of the source.=20 --=20 / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller ' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org --tKW2IUtsqtDRztdT Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (FreeBSD) iEYEARECAAYFAknoUKcACgkQDNor2+l1i33ydwCglLWPbp4ZEaU1rTWSaDBOk0Cj aMYAnjRynOzS9vnAZ0xTYLmV+saK697E =HL2O -----END PGP SIGNATURE----- --tKW2IUtsqtDRztdT--