Performance Observations And Tips - IBM 170 Servers Manual

Transaction Type:
Request/Response
(RR) 128 Byte
Asym. Connect/Request/Response
(ACRR) 8K Bytes
Large Transfer
(Stream) 16K Bytes
Notes:
Capacity metrics are provided for nonsecure and each variation of security policy
The table data reflects System i as a server (not a client)
VPN measurements used transport mode, TDES, AES128 or RC4 with 128-bit key symmetric cipher and MD5 message
digest with RSA public/private keys. VPN anti-replay was disabled.
This is only a rough indicator for capacity planning. Actual results may differ significantly.
x, y and z are scaling constants, one for each NetPerf scenario.
The SSL and VPN measurements are based on a specific set of cipher methods and public key sizes.
Other choices will perform differently

5.6 Performance Observations and Tips

Communication performance on Blades may see an increase when the processors are in shared mode.
This is workload dependent.
Host Ethernet Adapters require 40 to 56 MB for memory per logical port to vary on.
IBM Power 550, 9409-M50 May show 2 to 5 percent increase over IBM Power 520, 9408-M25 due
to the incorporation of L3 cache. Results will vary based on workload and configuration.
Virtual ethernet should always be configured with jumbo frame enabled
In 6.1 Packet Trainer is defaulted to "off" but can be configured per Line Description in 6.1.
Virtual ethernet may see performance increases with Packet Trainer turn on. This depends on
workload, connection type and utilization.
Physical Gigabit lines may see performance increases with Packet Trainer off. This depends on
workload, connection type and utilization.
Host Ethernet Adapter should not be used for performance sensitive workloads, your throughput can
be greatly affected by the use of other logical ports connected to your physical port on additional
partitions.
Host Ethernet Adapter may see performance increases with Packet Trainer set to on, especially with
regard to HEA's internal Logical Switch and Partition to Partition traffic via the same port group.
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
VPN Relative Performance
(scaled to Nonsecure baseline)
Nonsecure AH with
TCP/IP MD5
1.0 x 2.7
1.0 y 5.0
1.0 z 10.9
.
Chapter 5 - Communications Performance
ESP with ESP with
RC4 / MD5 AES128 /
SHA-1
3.6 3.8
6.6 7.6
15.4 18.7
ESP with TDES /
SHA-1
7.9
27.5
88.8
72