Greetings, I subscribed to this list today because I currently face issues with a VM and I am not yet able to solve these issues by myself. At first I posted to the list "libvirt-users@xxxxxxxxxx", you can read that thread at http://www.spinics.net/linux/fedora/libvirt-users/msg03556.html - I continued testing today and think it has to do with the IO-stuff: copying files within the guest sometimes takes very long time ... it seems as if the communication guest to host somehow breaks. Right now I use the VM listed in the end of this mail. I switched from using LVM-volumes to raw-files now, just to check things. It didn't change things. The guest is an ancient Suse Linux 6.1 on a 2.2.5 kernel. I have to stay with this to provide an environment for a specific software (just let's say this is a given fact ...). This very guest runs without these performance hickups on a VMware Server 2.0 ... I want to migrate from there to improve performance and get rid of that unsupported VMware-Server. My questions: What is the recommended config for a VM hosting such a kernel? What to chose at setup time, what CPU, what IO-caching strategy, etc ... Is my choice of "arch" and "cpu" ok or might the current setup lead to that erratic behavior? Right now I run on the host: gentoo linux 64 bit, Kernel 3.6.1 qemu-kvm-1.1.1-r1 libvirt-0.9.13-r1 For sure, KVM is compiled into the kernel ... and I took care of stuff like RTC, high res timers etc. I would appreciate any feedback on this issue! Thanks in advance, Stefan -- VM config now --> <domain type='kvm'> <name>linux4</name> <uuid>f1ac2054-10a1-d16a-da76-c1c5bf2fba2e</uuid> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='static'>2</vcpu> <os> <type arch='x86_64' machine='pc-1.1'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>kvm32</model> </cpu> <clock offset='localtime'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/mnt/kvm_storage/hda.raw'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/mnt/kvm_storage/hdb.raw'/> <target dev='hdb' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <controller type='usb' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:3e:0d:ef'/> <source bridge='br0'/> <model type='pcnet'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes'/> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </memballoon> </devices> </domain>
