1
Protocol design for All-IP Computer Framework
ICOIN 2008 23 - 25, Jan, 08
Kouji Okada, Keisuke Muda, Yoshifuji, Nishida Hideaki Yoshifuji, Ryuji Wakikawa, Jun Murai
Keio University
2
Research Objectives
Human Centric Computer Network
Unbundle
users from the restriction of “terminals” Independent of both of the “location” and the “terminals”, users continue to use same application environments.
According to users’ application usage scenarios, computer syste ms are re-configured dynamically
All-IP Computer Architecture
Replace the computer buses with IP networks
Virtual computers which consists of IP networking computer devi ces
Flexible computer environment re-configuration utilizing computi ng resources on the global IP network
3
IP Network s
IP Network s
CPU Memory
Display Keyboard Mouse
Input/Output devices
Host OS HDD
Home Network
Visited Network
Computing Resource Network
All-IP Computer Architecture
Home Rendezvous
Manager (Home RM)
Local Rendezvous
Manager (Local RM)
User Tag
User Data
Scope of this paper
An All-IP Computer consists of
I/O devices located around user’s current location
Storage devices in the user’s home
Computational resources allocated somewhere in the n etwork
Operating Systems running on the host computers
The main focus of this paper
As the first step, the method to realize dynamic I/O
device allocation and the performance evaluation of
IP networking I/O devices
5
Rendezvous Manager (RM)
The device management server for each local networks
Functionalities
Device list management
Resource allocation
User authentication
Types of RMs
Local RM
The RM located on the user’s current network
Responsible for All-IP computers construction
I/O devices, host computer
Home RM
The RM located on the user’s home
HDD
Remote RM
The RM located on the user’s previous network (migration)
6
Host OS
Device
Device Driver
IP Networ ks
IP Networ ks
Operating System
(OS)
Device
Device Driver
Computer device analysis
Host Computer
Device Control OS
Existing Computer Architecture All-IP Computer Architecture
Device dependent
data/control messages over IP networks
7
Existing Approaches
iSCSI (Internet Small Computer System Interface)
The protocols to handle SCSI command set on the TCP/IP protocol stack
RFC 3720, RFC 3783
USB/IP
Deliver the USB data encapsulated as TCP segments on I P networks
draft-muda-iusb-ps-00
For additional history on network-attached peripherals
Van Meter, Operating Systems Review (OSR), Jan. 1996
“A Brief Survey of Current Network Attached Peripherals”
8
All-IP Computer Initialization
IP Network s
IP Network s
Display Keyboard Mouse
Input/Output devices
Host Computer HDD
Home Network
Visited Network
Home Rendezvous
Manager (Home RM)
Local Rendezvous
Manager (Local RM)
User Tag
1) A user tag search for the
local RM by RM request messages which contains the authentication
information RM Discovery
/Resource Request
2) The local RM
authenticate the user
9
All-IP Computer Initialization
IP Network s
IP Network s
Display Keyboard Mouse
Input/Output devices
Host Computer HDD
Home Network
Visited Network
Home Rendezvous
Manager (Home RM)
Local Rendezvous
Manager (Local RM)
User Tag
3) The local RM intermediates the user authentication to
the home RM Authentication information/
Device Request
4) The local RM
send a device request for the devices specified in the resource request
10
All-IP Computer Initialization
IP Network s
IP Network s
Display Keyboard Mouse
Input/Output devices
Host Computer HDD
Home Network
Visited Network
Home Rendezvous
Manager (Home RM)
Local Rendezvous
Manager (Local RM)
User Tag
5) The local RM
Allocates I/O devices and host computer to the user
11
All-IP Computer Initialization
IP Network s
IP Network s
Display Keyboard Mouse
Input/Output devices
Host Computer HDD
Home Network
Visited Network
Home Rendezvous
Manager (Home RM)
Local Rendezvous
Manager (Local RM)
User Tag 6) The local RM
triggers the host computer to connect devices
by the device notification message
Device Notification
12
All-IP Computer Initialization
IP Network s
IP Network s
Display Keyboard Mouse
Input/Output devices
Host Computer HDD
Home Network
Visited Network
Home Rendezvous
Manager (Home RM)
Local Rendezvous
Manager (Local RM)
User Tag 7) The local RM
send to the user a resource reply
message which indicates the physical location
of the I/O devices
Resource Reply
13
Evaluation
Objectives
To understand allowable network delay for IP networked comput er devices
Evaluation Environment
3 nodes on the testbed network
USB/IP server, USB/IP client, Dummynet bridge
Evaluation overview
We Evaluated the time gaps between “pressed” and “released” k eyboards events on the USB/IP client PC
Dummynet bridge used to vary network latency in 10msec in crements
USB/IP server (Device) USB/IP client
(Host Computer)
Dummynet Bridge
14
Evaluation results
0 100 200 300 400 500 600 700
0 50 100 150 200 250 300
Dummynet delay (msec) RTT (msec)
USB-IP ICMP
The gaps were increased according to the network delay
→ The network delay is beyond the USB’s assumed latency
The Keyboard events began to be lost
Dummynet Delay (msec)
RTT (msec)
15
Conclusion
All-IP based computer architecture design
We defined a new computer architecture called “All-IP computer architecture”
Protocol design for dynamic All-IP computer configura tion
Evaluation of devices interconnection protocols
We have obtained an allowable network delay
Future Plans
Network storage/file systems
The protocol for the OS migration
16
Acknowledgement
Keio University
Dr. Rodney Doyle Van Meter III
Tokyo University
Dr. Kei Hiraki
Dr. Mari Inaba
