Simple issue. I'm running 5 KVM/QEmu instances. the host machine is constantly freezing for about a half a second in every 5. Disk LED hints that it is disk write related. Host is FC14, guests of FC14/FC15/Windows 7/BSD
The host machine is 100% unresponsive during these small periods. Any kb/mouse input "catches up" after the pause.
Tried using different cache modes in libvirt, different disk types and the issue is constant regardless of the number of guests (though Windows makes it worse, even when paused).
Here is the typical cmd executed by libvirt.
/usr/bin/qemu-kvm -S -M pc-0.13 -cpu phenom,+wdt,+skinit,+osvw,+3dnowprefetch,+misalignsse,+sse4a,+abm,+cr8legacy,+extapic,+cmp_legacy,+lahf_lm,+rdtscp,+pdpe1gb,+popcnt,+cx16,+ht,+vme -enable-kvm -m 2048 -smp 3,sockets=3,cores=1,threads=1 -name devserver -uuid aaa-bbb-ccc-ddd-eee-fff -nodefconfig -nodefaults -chardev socket,id=monitor,path=srv.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=utc -boot c -drive file=srv.img,if=none,id=drive-virtio-disk0,boot=on,format=raw -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0 -drive file=srv_data.img,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 -drive file=srv_home.vmdk,if=none,id=drive-virtio-disk1,format=vmdk -device virtio-blk-pci,bus=pci.0,addr=0x7,drive=drive-virtio-disk1,id=virtio-disk1 -device rtl8139,vlan=0,id=net0,mac=aa:bb:cc:dd:ee,bus=pci.0,addr=0x3 -net tap,fd=51,vlan=0,name=hostnet0 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -vga cirrus -device AC97,id=sound0,bus=pci.0,addr=0x4 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6
Any idea as to possible tweaks to help this issue?
Thanks in advance.