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For virtio disks and interfaces, qemu allows users to enable or disable ioeventfd feature. This means, qemu can execute domain code, while another thread waits for I/O event. Basically, in some cases it is win, in some loss. This feature is available via 'ioeventfd' attribute in disk and interface <driver> element. It accepts 'on' and 'off'. Leaving this attribute out defaults to hypervisor decision.
12 lines
849 B
Plaintext
12 lines
849 B
Plaintext
LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
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/usr/bin/qemu -S -M pc-0.13 -m 1024 -smp 1 -nodefaults \
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-monitor unix:/tmp/test-monitor,server,nowait -no-acpi \
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-boot dc -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 \
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-drive file=/var/lib/libvirt/images/f14.img,if=none,id=drive-virtio-disk0 \
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-device virtio-blk-pci,ioeventfd=on,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 \
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-drive file=/var/lib/libvirt/Fedora-14-x86_64-Live-KDE.iso,if=none,media=cdrom,id=drive-ide0-1-0 \
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-device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 \
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-device virtio-net-pci,tx=bh,ioeventfd=off,vlan=0,id=net0,mac=52:54:00:e5:48:58,bus=pci.0,addr=0x3 \
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-net user,vlan=0,name=hostnet0 -serial pty -usb -vnc 127.0.0.1:-809 -std-vga \
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-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
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