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Virtual LAN (VLAN) support based on IEEE 802.1Q standard. This implementation only supports VLANs using Ethernet interfaces. AIX VLAN support requires IEEE 802.1Q compliant switches.
TCP/IP now supports hardware offload of TCP resegmentation for transmitted TCP segments in conjunction with the Gigabit Ethernet-SX PCI Adapter and IBM 10/100/1000 Base-T Ethernet PCI Adapter. This capability is enabled using an additional SMIT adapter configuration menu option, titled "Enable hardware transmit TCP resegmentation". The default value for this option is "no", but can be enabled by the user. This feature allows TCP to send a large TCP segment (up to 64K bytes) to the adapter and the adapter will then resegment this buffer into smaller 1500 byte packets to be sent on the Ethernet network.
This reduces the AIX system overhead which lowers the CPU utilization, and releases CPU cycles to be used for other work by the server. However, the adapter must now resegment the buffer and recompute the TCP checksums, which typically reduces the raw throughput on each adapter. In laboratory measurements, system CPU utilization has been observed to drop by 10% to 60% while the raw throughput may degrade by 10% to 30% (these numbers will vary by workload). However, the raw throughput may increase when using multiple adapters by as much as 25%. This feature is not for all workloads but should be evaluated when there is a need to reduce server CPU utilization and is most useful when the server sends more data than it receives.
DVD-RAM Drive Support
AIX 5L Version 5.1 supports both R/W DVD-RAM, high-capacity DVD-ROM, and standard CD-ROM media. AIX CD-ROM device driver has been enhanced to support DVD-RAM drive. The UDF (Universal Disk Format) File System is not supported by this release. The following AIX functions are supported:
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