VM-DB

• Welcome to the project of the VM-DB,VM-DB for the Virtual Machine Database
• Files in this repository are mainly used for detecting and debuging the the path of the qemu disk IO.
• Files in this repository can be used in any where you like.
• If you are interested in this project,you can have a look on this website,maybe you should know some Chinese~

About

We are now adding a cache system under the qemu-kvm virtulazation's block layer to get a higher performance which is named gear-cache,now the cache system is running properly.But it's performance still not achieved the requests :(.

Architecture

After Adding Our GearCache

Dependence

• Qemu version >= 2.4.0
• Kernel >= 4.0

How to use it?

just put the source files in the core code directory to the qemu's sorce code(qemu-2.4.0/block),replace the old raw-posix.c with our new raw-posix.c .Then just compile the qemu source code as usual

If you use the instruction script to start the vm,adjust the parameters like this:

-drive file=centos7.img,if=virtio,aio=threads,cache=none

Bypassing the host page cache system,and using our own lightweight cache system on the block layer.

Using this script start our vms.

qemu -enable-kvm \
-m 1024 \
-smp 2 \
-netdev type=tap,script=/etc/qemu-ifup,downscript=no,id=net0 \
-device virtio-net-pci,netdev=net0,mac=00:11:22:33:22:FF \
-drive file=centos7.img,if=virtio,aio=threads,cache=none \
-nographic

License

MIT