From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752106Ab1IQKpQ (ORCPT ); Sat, 17 Sep 2011 06:45:16 -0400 Received: from mga11.intel.com ([192.55.52.93]:42834 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751100Ab1IQKpP (ORCPT ); Sat, 17 Sep 2011 06:45:15 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.68,398,1312182000"; d="p7s'?scan'208";a="54764275" From: "Woodhouse, David" To: Chris Boot CC: lkml Subject: Re: iommu_iova leak Thread-Topic: iommu_iova leak Thread-Index: Acx1JuBwq64VaQEWQsy7NC9XvFyOOQ== Date: Sat, 17 Sep 2011 10:45:12 +0000 Message-ID: <1316256305.24257.25.camel@shinybook.infradead.org> References: <4E734467.3040703@bootc.net> In-Reply-To: <4E734467.3040703@bootc.net> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Content-Type: multipart/signed; micalg=sha1; protocol="application/x-pkcs7-signature"; boundary="=-qspuKfdwc4IfAhqBT09i" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-qspuKfdwc4IfAhqBT09i Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2011-09-16 at 13:43 +0100, Chris Boot wrote: > In the very short term the number is up and down by a few hundred=20 > objects but the general trend is constantly upwards. After about 5 days'= =20 > uptime I have some very serious IO slowdowns (narrowed down by a friend= =20 > to SCSI command queueing) with a lot of time spent in > alloc_iova() and rb_prev() according to 'perf top'. Eventually these=20 > translate into softlockups and the machine becomes almost unusable. If you're seeing it spend ages in rb_prev() that implies that the mappings are still *active* and in the rbtree, rather than just the the iommu_iova data structure has been leaked. I suppose it's vaguely possible that we're leaking them in such a way that they remain on the rbtree, perhaps if the deferred unmap is never actually happening... but I think it's a whole lot more likely that the PCI driver is just never bothering to unmap the pages it maps. If you boot with 'intel_iommu=3Dstrict' that will avoid the deferred unmap which is the only likely culprit in the IOMMU code... --=20 Sent with MeeGo's ActiveSync support. 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