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Mon, 21 Jun 2021 04:25:51 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Mon, 21 Jun 2021 04:17:18 -0000 From: Launchpad Bug Tracker <1751264@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Expired; 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: janitor kyominii th-huth xanclic X-Launchpad-Bug-Reporter: Teddy VALETTE (kyominii) X-Launchpad-Bug-Modifier: Launchpad Janitor (janitor) References: <151939024836.30479.4933664010119224710.malonedeb@gac.canonical.com> Message-Id: <162424903870.11837.2074864818330726620.malone@loganberry.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="ed184eb8c3e03c8a0c3f47e69a5c546619a1af7c"; Instance="production" X-Launchpad-Hash: d108f78465f0f3b93ecd7b4bbca929e138c2652d Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -66 X-Spam_score: -6.7 X-Spam_bar: ------ X-Spam_report: (-6.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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" [Expired for QEMU because there has been no activity for 60 days.] ** Changed in: qemu Status: Incomplete =3D> Expired -- = 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: Expired 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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