hi, I'm running a virtual machine with the following command: LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-1.0 -enable-kvm -m 4096 -smp 2,sockets=2,cores=1,threads=1 -name korfu_ceph -uuid a9131b8f-d087-26f4-2ca9-018505f11838 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/korfu_ceph.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -no-shutdown -device lsi,id=scsi0,bus=pci.0,addr=0x4 -drive file=rbd:rd/korfu:rbd_cache=1:mon_host=rd-clusternode21\:6789\;rd-clusternode22\:6789,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -usb -vnc 127.0.0.1:0 -vga std -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 kvm-version is that from ubuntu LTS: 1.0+noroms-0ubuntu14.7 When I read or write big files the system basically gets unusable (mouse-cursor in VNC jerks across the screen, i/o is mostly on blocking). I know it is related to ceph in a way, but also to KVM, as it seems that there a lot of IRQ's happening (or how do you explain the mourse cursor in VNC jerking and lagging behind time?_) . Ceph Mailing List doesn't really help. High CPU load doesn't hurt the machine, it's only Harddisk I/O. Oh, and the main host running kvm doesn't really suffer, too. some i/o waiting, but not really swapping or something. Here's my libvirt-config if it is of any help: http://pastie.org/6411055 any hints would REALLY be appreciated... Wolfgang -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
