From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6DBC5C433ED for ; Wed, 21 Apr 2021 06:38:13 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F053F61426 for ; Wed, 21 Apr 2021 06:38:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F053F61426 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:51772 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lZ6V0-0003uW-NX for qemu-devel@archiver.kernel.org; Wed, 21 Apr 2021 02:38:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34836) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lZ6Sf-0002eD-5e for qemu-devel@nongnu.org; Wed, 21 Apr 2021 02:35:45 -0400 Received: from indium.canonical.com ([91.189.90.7]:46872) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lZ6SZ-0005Lh-U8 for qemu-devel@nongnu.org; Wed, 21 Apr 2021 02:35:44 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1lZ6SX-0001VL-Ra for ; Wed, 21 Apr 2021 06:35:37 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id CC9732E8157 for ; Wed, 21 Apr 2021 06:35:37 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 21 Apr 2021 06:28:08 -0000 From: Thomas Huth <1751264@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Incomplete; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: qemu-img X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: kyominii th-huth xanclic X-Launchpad-Bug-Reporter: Teddy VALETTE (kyominii) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <151939024836.30479.4933664010119224710.malonedeb@gac.canonical.com> Message-Id: <161898648816.10175.2393057152433014327.malone@wampee.canonical.com> Subject: [Bug 1751264] Re: qemu-img convert issue in a tmpfs partition X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="1552fceb1603b3da6cfa437575d9c9fc4b2e683a"; Instance="production" X-Launchpad-Hash: 6d2514d112484f47006ca6f170227e91f93af582 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1751264 <1751264@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The QEMU project is currently considering to move its bug tracking to anoth= er system. For this we need to know which bugs are still valid and which co= uld be closed already. Thus we are setting older bugs to "Incomplete" now. If you still think this bug report here is valid, then please switch the st= ate back to "New" within the next 60 days, otherwise this report will be ma= rked as "Expired". Or mark it as "Fix Released" if the problem has been sol= ved with a newer version of QEMU already. Thank you and sorry for the incon= venience. ** Changed in: qemu Status: New =3D> Incomplete -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1751264 Title: qemu-img convert issue in a tmpfs partition Status in QEMU: Incomplete Bug description: qemu-img convert command is slow when the file to convert is located in a tmpfs formatted partition. v2.1.0 on debian/jessie x64, ext4: 10m14s v2.1.0 on debian/jessie x64, tmpfs: 10m15s v2.1.0 on debian/stretch x64, ext4: 11m9s v2.1.0 on debian/stretch x64, tmpfs: 10m21.362s v2.8.0 on debian/jessie x64, ext4: 10m21s v2.8.0 on debian/jessie x64, tmpfs: Too long (50min+) v2.8.0 on debian/stretch x64, ext4: 10m42s v2.8.0 on debian/stretch x64, tmpfs: Too long (50min+) It seems that the issue is caused by this commit : https://github.com/qemu/qemu/commit/690c7301600162421b928c7f26fd488fd8fa4= 64e In order to reproduce this bug : 1/ mount a tmpfs partition : mount -t tmpfs tmpfs /tmp 2/ get a vmdk file (we used a 15GB image) and put it on /tmp 3/ run the 'qemu-img convert -O qcow2 /tmp/file.vmdk /path/to/destination= ' command When we trace the process, we can see that there's a lseek loop which is very slow (compare to outside a tmpfs partition). 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