similar to: Configure QCow2 L2 Cache through virt domain XML

On Mon, Sep 19, 2016 at 11:32:26AM -0400, Frank Myhr wrote: >QEMU's default qcow2 L2 cache size is too small for large images (and small cluster sizes), resulting in very bad performance. > >https://blogs.igalia.com/berto/2015/12/17/improving-disk-io-performance-in-qemu-2-5-with-the-qcow2-l2-cache/ >shows huge performance hit for a 20GB qcow2 with default 64kB cluster size: >

QEMU's default qcow2 L2 cache size is too small for large images (and small cluster sizes), resulting in very bad performance. https://blogs.igalia.com/berto/2015/12/17/improving-disk-io-performance-in-qemu-2-5-with-the-qcow2-l2-cache/ shows huge performance hit for a 20GB qcow2 with default 64kB cluster size: L2 Cache, MiB Average IOPS 1 (default) 5100 1.5

There is a bug which is still not fixed:Bug 956580 -[ RFE ]Support for VMware & Citrix OVF image import into RHEV https://bugzilla.redhat.com/show_bug.cgi?id=956580 Best regards, Tingting Zheng（郑婷婷） ----- Original Message ----- From: "Rom Freiman" <rom@stratoscale.com> To: libguestfs@redhat.com Sent: Wednesday, January 15, 2014 10:35:29 PM Subject: [Libguestfs] Double fault

Hi everybody, Wanted to hear your opinion and to receive a smart advice. I'm trying to use virt-v2v in order to convert ova image (exported from vmware) to run on libvirt/kvm - all this inside a VM of fedora. The converted image is also a fedora. During the conversion process, in some point of libguestfs activity, I get double fault panic from L2 (printed as part of libguest output) and the

Heya, With latest Fedora Rawhide Kernel, I see a nested KVM guest hanging at boot (not unusual). Rich once suggested this[1] to try to attach gdb to the nested L2 guest to find out where_ it's stuck, tonight I set out to try it out (with KVM & TCG). Below is all what I tried. In guest hypervisor (L1): $ git clone git://github.com/libguestfs/libguestfs.git $ git log | head -1

Hi， I used 'virsh snapshot-create' create an encrypted external snapshot, when I try to use 'qemu-img check' top file, found no entrance to pass backing-file's secret-id 1、Version centos-release-8.2-2.2004.0.1.el8.x86_64 libvirt.x86_64 6.0.0-17.el8 qemu-kvm.x86_64

Den 2023-04-05 kl. 09:47, skrev Peter Krempa: > The backup operation is quite complex so it is possible. > Please have a look into /var/log/libvirt/qemu/$VMNAME.log to see whether > qemu logged something like an assertion failure before crashing. > > Additionally you can have a look into 'coredumpctl' whether there are > any recorded crashes of

qemu-img info 100/vm-100-disk-0.qcow2 image: 100/vm-100-disk-0.qcow2 file format: qcow2 virtual size: 120 GiB (128849018880 bytes) disk size: 916 GiB cluster_size: 65536 Format specific information: compat: 1.1 compression type: zlib lazy refcounts: false refcount bits: 16 corrupt: false extended l2: false Child node '/file': filename: 100/vm-100-disk-0.qcow2

Greetings Please forgive the OT question yet I highly value the experience and wisdom on this list I am wondering if anyone here can address the performance difference between having a processor board with say 256KB L2 *and* 2048KB L3 cache *VERSUS* just having the same processor board with just the L2 cache in a centos server environment... Please figure that all other necessary and related

Hi there. I can't understand why I am having this different values: proxmox01:/vms/images# df Sist. Arq. Tam. Usado Disp. Uso% Montado em udev 252G 0 252G 0% /dev tmpfs 51G 9,4M 51G 1% /run /dev/sda4 433G 20G 413G 5% / tmpfs 252G 63M 252G 1% /dev/shm tmpfs 5,0M 0 5,0M 0% /run/lock efivarfs 496K 335K

What's your gluster version ? Best Regards,Strahil Nikolov ? ??????????, 11 ??????? 2024 ?. ? 20:57:50 ?. ???????+2, Gilberto Ferreira <gilberto.nunes32 at gmail.com> ??????: Hi there. I can't understand why I am having? this different values: proxmox01:/vms/images# df Sist. Arq. ? ? ?Tam. Usado Disp. Uso% Montado em udev ? ? ? ? ? ?252G ? ? 0 ?252G ? 0% /dev tmpfs ? ? ?

Il 30-01-2018 13:17 Gionatan Danti ha scritto: > Hi all, > on a fully patched CentOS 7.4 x86-64, I see the following behavior: > > - when creating a new volumes using vol-create-as, the resulting file > is a qcow2 version 2 (compat=0.10) file. Example: > > [root@gdanti-lenovo vmimages]# virsh vol-create-as default zzz.qcow2 > 8589934592 --format=qcow2 --backing-vol

11.1 --- Gilberto Nunes Ferreira +55 (47) 99676-7530 Proxmox VE VinChin Backup & Restore Em qua., 20 de nov. de 2024, 19:28, Strahil Nikolov <hunter86_bg at yahoo.com> escreveu: > What's your gluster version ? > > Best Regards, > Strahil Nikolov > > ? ??????????, 11 ??????? 2024 ?. ? 20:57:50 ?. ???????+2, Gilberto > Ferreira <gilberto.nunes32 at

Have you figured it out ? Have you tried setting storage.reserve to 0 ? Best Regards, Strahil Nikolov On Thu, Nov 21, 2024 at 0:39, Gilberto Ferreira<gilberto.nunes32 at gmail.com> wrote: 11.1 --- Gilberto Nunes Ferreira +55 (47) 99676-7530 Proxmox VE VinChin Backup & Restore Em qua., 20 de nov. de 2024, 19:28, Strahil Nikolov <hunter86_bg at yahoo.com> escreveu:

No! I didn't! I wasn't aware of this option. I will try. Thanks Em sex., 29 de nov. de 2024 ?s 16:43, Strahil Nikolov <hunter86_bg at yahoo.com> escreveu: > Have you figured it out ? > > Have you tried setting storage.reserve to 0 ? > > Best Regards, > Strahil Nikolov > > On Thu, Nov 21, 2024 at 0:39, Gilberto Ferreira > <gilberto.nunes32 at

This question was asked on IRC: $ virt-builder centos-6 --output box.img --format qcow2 --size 40G # ... $ qemu-img convert -O qcow2 box.img box-qcow2.img $ ls -lAhs 1.6G -rw-r--r--. 1 james 41G Jan 2 21:53 box.img 1.1G -rw-r--r--. 1 james 1.1G Jan 3 18:54 box-qcow2.img $ file box* box.img: QEMU QCOW Image (v2), 42949672960 bytes box-qcow2.img: QEMU QCOW Image (v2),

Hello, Is there any way for a pass to determine the L1 or L2 cacheline size of the target before the IR is lowered to machine instructions? Thanks, -- Nick Johnson

Dear all, Is there a command or low level instruction to disable the L2 cache in GPUs. Can a certain section of memory be defined as uncachable. Can you please point me the approach to do it. Thank you Vishwas -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20161107/a1b678b7/attachment.html>

use the virt-df to query vm disk usage like this: virt-df -a /home/centos7_mini.qcow2 then check: virsh list --all Id Name State 1 guestfs-p1km7lhfowv8o0q1running //virt-df will create a vm in temp filesystem but after a few minutes , still fails to get the vm disk usage , why ?? [root@bogon libguestfs-1.38.2]# uname -ar Linux bogon 3.10.0 #2 SMP Thu Nov 28 06:06:42 UTC 2019 x86_64 x86_64

On Tue, May 17, 2016 at 6:01 PM, Richard W.M. Jones <rjones@redhat.com> wrote: > On Tue, May 17, 2016 at 05:53:31PM +0300, Yaniv Kaul wrote: > > On Tue, May 17, 2016 at 5:48 PM, Richard W.M. Jones <rjones@redhat.com> > > wrote: > > > > > On Tue, May 17, 2016 at 03:41:53PM +0100, Richard W.M. Jones wrote: > > > > On Tue, May 17, 2016 at