Chapter 7. Software support 279
7.3.62 QDIO optimized latency mode
QDIO optimized latency mode (OLM) can help improve performance for applications that
have a critical requirement to minimize response times for inbound and outbound data.
OLM optimizes the interrupt processing in the following manner:
For inbound processing, the TCP/IP stack looks more frequently for available data to
process. This process ensures that any new data is read from the OSA-Express5S or
OSA-Express4S without needing more program controlled interrupts (PCIs).
For outbound processing, the OSA-Express5S or OSA-Express4S also look more
frequently for available data to process from the TCP/IP stack. Therefore, the process
does not require a Signal Adapter (SIGA) instruction to determine whether more data is
available.
7.3.63 Large send for IPv6 packets
Large send for IPv6 packets improves performance by offloading outbound TCP
segmentation processing from the host to an OSA-Express5S and OSA-Express4S feature
by employing a more efficient memory transfer into OSA-Express5S and OSA-Express4S.
Large send support for IPv6 packets applies to the OSA-Express5S and OSA-Express4S
features (CHPID type OSD and OSX), and is exclusive to z13, z13s, zEC12, zBC12, z196,
and z114 servers. With z13s, large send for IPv6 packets (segmentation offloading) for
LPAR-to-LPAR traffic is supported. The minimum support requirements are listed in
Table 7-50.
Table 7-50 Minimum support requirements for large send for IPv6 packets
Operating system Support requirements
z/OS z/OS V1R13
a
a. PTFs are required.
z/VM z/VM V6R2 for guest use only
To Next Page
Loading...
Need help?
General