HP Tru64 UNIX and TruCluster Server Version 5.1B-5 Patch Summary and Release Notes (March 2009)

inet:
tcp_rst_win = 2048
3.2.2.10.2 Adjusting the tcp_syn_win Variable
You can adjust the TCP SYN window variable, tcp_syn_win, as follows:
# sysconfig -q inet tcp_syn_win
inet:
tcp_syn_win = -1
# sysconfig -r inet tcp_syn_win=2048
tcp_syn_win: reconfigured
# sysconfig -q inet tcp_syn_win
inet:
tcp_syn_win = 2048
# sysconfig -q inet tcp_syn_win /tmp/tcp_syn_win_merge
# sysconfigdb -m -f /tmp/tcp_syn_win_merge inet
# sysconfigdb -l inet
inet:
tcp_syn_win = 2048
3.2.2.11 Modification to Changer Driver May Affect Some Applications
As a side effect of resolving issues with multiple access to the changer, the changer
driver now requires a short period of exclusive access to the changer device as part of
opening the device. For applications that have several threads or processes accessing
a single changer simultaneously, this can result in waits for access to the changer device
in the process of an open call. That wait can be lengthy as some changer commands
can have long response times.
In general this behavioral change will not affect the overall throughput to a changer
device, as this wait would have occurred at the time of any I/O (for example, IOCTLS)
to the changer.
If having the changer wait in this fashion presents a problem, the old behavior can be
approximated by passing either the O_NONBLOCK or O_NDELAY flags at the open of
the changer device. In that situation the first actual I/O (usually an IOCTL) may incur
the wait as the open is partially delayed in that case.
3.2.2.12 Data Sorting of Audit Records May Be Required on Single CPU System
The net_tcp_stray_packet, net_udp_stray_packet, and
net_tcp_rejectd_conn network events are handled by the audit subsystem
differently from other auditable events. As a result, these events may be placed into
the audit log out of order with respect to other events.
3.2 Prior Release Notes 67