IBM 170 Servers Manual page 68

Virtual Ethernet
FTP
1 Session
2 Sessions
3 Sessions
5.4 TCP/IP non-secure performance
In table 5.4 you will find the payload information for the different Ethernet types. The most important
factor with streaming is to determine how much data can be transferred. The results are listed in bits and
bytes per second. Virtual Ethernet does not have a raw bit rate, since the maximum throughput is
determined by the CPU.
Table 5.4
Raw bit rate
Ethernet Type
(Mbits per second)
100 Megabit
1 Gigabit
5
10 Gigabit
HEA 1 Gigabit
HEA 10 Gigabit
8
Blade
6
Virtual
Notes:
1. The Raw bit rate value is the physical media bit rate and does not reflect physical media overheads
2. Maximum Transmission Unit. The large (8992 bytes) MTU is also referred to as Jumbo Frames.
3. Simplex is a single direction TCP data stream.
4. Duplex is a bidirectional TCP data stream.
5. The 10 Gigabit results were obtained by using multiple sessions, because a single sessions is incapable to fully utilize the
10 Gigabit adapter.
6. Virtual Ethernet uses Jumbo Frames only, since large packets are supported throughout the whole connection path.
7. HEA P.P.U.T (Partition to Partition Unicast Traffic or internal switch) 16 Gbps per port group.
8. 4 Processor 7998-61X Blade
9. All measurements are performed with Full Duplex Ethernet.
Streaming data is not the only type of communication handled through Ethernet. Often server and client
applications communicate with small packets of data back and forth (RR). In the case of web browsers,
the most common type is to connect, request and receive data, then disconnect (ACRR). Table 5.5
provides some rough capacity planning information for these RR and ACRR communications.
Table 5.5
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
1 Disk Unit ASP on 2757 IOA
Streaming Performance
1
2
MTU
100 1,492
1,492
1,000
8,992
1,492
10,000
8,992
1,492
1,000
8,992
1,492
7
160,00
8,992
1,492
10,000
8,992
1,492
7
160,00
8,992
n/a 1,492
n/a 8,992
Chapter 5 - Communications Performance
Performance in MB per second
15 Disk Units ASP on 2757 IOA
10.8
10.5
10.4
3
Payload Simplex
(Mbits per second)
93.5
935.4
935.9
3745.4
8789.6
986.4
941.1
2811.8
9800.7
2913.1
9392.3
2823.5
9813.7
933.1
8553.0
42.0
70.0
75.0
4
Payload Duplex
(Mbits per second)
170.0
1740.3
1753.1
4400.7
9297.0
1481.4
1960.9
6331.0
10586.4
3305.2
9276.9
6332.3
10602.3
1014.4
11972.3
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