search for: iotune

Hi, reading the below[1] on blkdeviotune made me wonder if we can dynamically change the values after the VM is already running using iotune. Is it supported? Thanks, Doron [1] https://fedoraproject.org/wiki/QA:Testcase_Virtualization_IO_Throttling

On 04/09/2014 08:02 AM, Doron Fediuck wrote: > Hi, > reading the below[1] on blkdeviotune made me wonder if we can dynamically > change the values after the VM is already running using iotune. > > Is it supported? Yes. 'virsh blkdeviotune' will do it (which makes calls to the underlying virDomainSetBlockIoTune() API). -- Eric Blake eblake redhat com +1-919-301...

Hi All, I am setting the value for "read_bytes_sec" using the following API code virDomainSetBlockIoTune(dom, "/mnt/tmpsdb/FileVM1", parainfoPtr, nparams, 2); I am succesfully able to set this value and i can read it back using the API virDomainGetBlockIoTune(dom,"/mnt/tmpsdb/FileVM1",parainfoPtr,&nparams,2); But after setting this value when i shutdown my VM and start it a...

...device="disk"> <driver name="qemu" type="qcow2" cache="none"/> <source file="/data1/lib/nova/instances/27f49e5c-8ee0-4a09-8269-5fa31acd2983/disk"/> <target bus="virtio" dev="vda"/> <iotune> <read_bytes_sec>25600000</read_bytes_sec> <write_bytes_sec>40960000</write_bytes_sec> </iotune> </disk> <interface type="bridge"> <mac address="fa:16:3e:49:04:ce"/> <model type=&quot...

...rr F I0928 23:00:03.816558 1 cephvolume.go:73] attach disk &{XMLName:{Space: Local:} Device:disk RawIO: SGIO: Snapshot: Model: Driver:0xc00073b420 Auth:0xc000f49e40 Source:0xc000159860 BackingStore:<nil> Geometry:<nil> BlockIO:<nil> Mirror:<nil> Target:0xc000a58b40 IOTune:0xc00019b970 ReadOnly:<nil> Shareable:<nil> Transient:<nil> Serial:pvc-33003998-6624-4ac9-a923-d94f9401abdf WWN: Vendor: Product: Encryption:<nil> Boot:<nil> Alias:<nil> Address:0xc001420b40} error: virError(Code=27, Domain=20, Message='XML error: target ...

On Tue, Oct 13, 2020 at 8:40 PM Richard W.M. Jones <rjones@redhat.com> wrote: > > On Tue, Oct 13, 2020 at 07:56:29PM +0300, Nir Soffer wrote: > > On Tue, Oct 13, 2020 at 7:15 PM Richard W.M. Jones <rjones@redhat.com> wrote: > > > > > > On Tue, Oct 13, 2020 at 06:45:42PM +0300, Nir Soffer wrote: > > > > I think this is the right solution - when

...tly/565/ > > https://jenkins.ovirt.org/job/ovirt-system-tests_basic-suite-master_nightly/565/artifact/exported-artifacts/test_logs/basic-suite-master/lago-basic-suite-master-host-1/_var_log/vdsm/vdsm.log > > 2020-11-09 01:05:42,031-0500 INFO (jsonrpc/4) [api.host] FINISH > getAllVmIoTunePolicies return={'status': {'code': 0, 'message': > 'Done'}, 'io_tune_policies_dict': > {'c189ecb3-8f2e-4726-8766-7d2d9b514687': {'policy': [], > 'current_values': [{'name': 'vda', 'path': > '/rhe...

...s_basic-suite-master_nightly/565/ https://jenkins.ovirt.org/job/ovirt-system-tests_basic-suite-master_nightly/565/artifact/exported-artifacts/test_logs/basic-suite-master/lago-basic-suite-master-host-1/_var_log/vdsm/vdsm.log 2020-11-09 01:05:42,031-0500 INFO (jsonrpc/4) [api.host] FINISH getAllVmIoTunePolicies return={'status': {'code': 0, 'message': 'Done'}, 'io_tune_policies_dict': {'c189ecb3-8f2e-4726-8766-7d2d9b514687': {'policy': [], 'current_values': [{'name': 'vda', 'path': '/rhev/data-center/mnt/19...

Hi, I'm trying to figure out what controls the number if in-flight virtio block operations when running linux in qemu on top of a linux host. The problem is that we're trying to run as many VMs as possible, using ceph/rbd for the rootfs. We've tripped over the fact the the memory consumption of qemu can spike noticeably when doing I/O (something as simple as "dd" from

Hi, I'm trying to figure out what controls the number if in-flight virtio block operations when running linux in qemu on top of a linux host. The problem is that we're trying to run as many VMs as possible, using ceph/rbd for the rootfs. We've tripped over the fact the the memory consumption of qemu can spike noticeably when doing I/O (something as simple as "dd" from

...n. Both host and guest are using deadline as I/O scheduler. The VM uses an ext4 filesystem, while the image is saved on an ext3 disk. I mounted the host and guest filesystems specifying nodiratime and noatime options. Even if I convert the image to raw format nothing changes. I didn't mess with iotune nor blockio. Is there something that I overlooked or any other suggestion? Thanks in advance for your help. Matteo -- A refund for defective software might be nice, except it would bankrupt the entire software industry in the first year. Andrew S. Tanenbaum, Computer Networks, 2003, Introdu...

Hi, is there a way to configure blkio via libvirt (xml)? Regards Erkan -- ?ber den grenzen mu? die freiheit wohl wolkenlos sein

Hi all, is there a way to limit the throughput (or the number of operations per seconds) of a block device? I ask because I've a couple of misconfigured VMs that are performing a lot of disk activity (swapping I'd bet but I haven't access to their OS). Since their storage is on a NFS share they are slowing down other VMs on the same share. Thank you. Davide.

...k a kernel panic in > virtqueue_add_buf(). > > Can someone with more knowledge of how virtio block works point me in the > right direction? You can use QEMU's I/O throttling as a workaround: qemu -drive ...,iops=64 libvirt has XML syntax for specifying iops limits. Please see <iotune> at http://libvirt.org/formatdomain.html. I have CCed Josh Durgin and Jeff Cody for ideas on reducing block/rbd.c memory consumption. Is it possible to pass a scatter-gather list so I/O can be performed directly on guest memory? This would also improve performance slightly. Stefan

...uf(). >> >> Can someone with more knowledge of how virtio block works point me in the >> right direction? > > You can use QEMU's I/O throttling as a workaround: > qemu -drive ...,iops=64 > > libvirt has XML syntax for specifying iops limits. Please see > <iotune> at http://libvirt.org/formatdomain.html. IOPS limits are better than nothing, but not an actual solution. There are two problems that come to mind: 1) If you specify a burst value then a single burst can allocate a bunch of memory and it rarely drops back down after that (due to the usual...

...uf(). >> >> Can someone with more knowledge of how virtio block works point me in the >> right direction? > > You can use QEMU's I/O throttling as a workaround: > qemu -drive ...,iops=64 > > libvirt has XML syntax for specifying iops limits. Please see > <iotune> at http://libvirt.org/formatdomain.html. IOPS limits are better than nothing, but not an actual solution. There are two problems that come to mind: 1) If you specify a burst value then a single burst can allocate a bunch of memory and it rarely drops back down after that (due to the usual...