One more trip to China, Shenzhen

Some photos from the ferry boat station in HK international airport

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Some city views

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Some street art

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City subway

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Some highway (on the way to beach)

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A few fotos from sandy beach

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And yeah I was swimming there and the water is pretty nice nothing to compare with the wind outside...

Virtio VHOST

In this post I'd like to discribe the current situtation with Virtio based IO in KVM and give some ways of improvements. Firstly I'd like to explain what is Virtio and how it works.

Virtio is acronim from Virtualization Input Output. Virtio is a set of device drivers which implements paravirtualized logic for device representation. If virtio device attached to the virtual machine (VM), VM starts to now that it is running in virtual environment. The design of each virtio device is shown at the figure below. Alt text here

Virtio provides set of devices necessary for productive work: 1. PCI 2. Baloon 3. Console 4. Network 5. Block Logical block scheme is shown at the figure below. Alt text here

Lets discover the implementation of virtio stack. There are 2 options. First it is implemented through user space workflow over QEMU.Second is VHOST implementation which directly redirects calls from guest kernel to host kernel and reduce significant overhead due context swithces and global mutexes still existing in QEMU core. Block device scheme is shown at the figure below. Alt text here

Its not hard to see how much overhead reduced. The similar scheme is implemented for networking.

RedHat Enterprise Virtualization seminar

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A few fotos of China, Shenzhen

Street view

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Panaramic photo at beach

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From the sky

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A few photos @ Edinburgh, UK

Ediburgh Catle

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Calidonian hotel

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Some place

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Street view

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