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Table 10 HP-UX 11i v3 May 2012 Fixes — 10GigEthr-02 B.11.31.1205
SR number
Description
QXCR1001209171
AVIO: High outbound discards on HPVM guest with iexgbe interface. TCP connections (such
as rlogin and telnet) from a remote system to the guest do not work and the guest hangs
intermittently.
QXCR1001182096
When packets with an invalid LLC, IP or TCP header length are sent through the HPVM guest
igssn interface, the iexgbe driver will drop such packets. But the guest is not aware of
such drops and it continues to expect send completion for those packets. This situation results
in a gradual reduction of the number of usable descriptors for igssn, which causes
performance to degrade and, eventually, the igssn interface to hang.
QXCR1001192266
For non-Flex-10 (non-VC) interfaces, when using customized iexgbe configuration file settings
that enable Jumbo Frames (MTU size greater than 1500), problems occur at startup. This
problem surfaced after Tx and Rx flow control support was introduced to the iexgbe driver
(QXCR1001093086). The workaround in the preceding release was to disable flow control
by default. The B.11.31.1205 release sets Tx and Rx flow control to ON by default. Any
request to turn on Jumbo Frames will override the Rx flow control settings and automatically
set Rx flow control to OFF.
Table 11 HP-UX 11i v3 March 2012 Fixes — 10GigEthr-02 B.11.31.1203.01
SR number
Description
QXCR1001192266
Disables flow control by default. This removes the possibility of bringing up issues introduced
with the B.11.31.1201 release (QXCR1001093086). For more information about the issues,
see Section 4 (page 12).
4 Known problems and limitations
The following problems and limitations are known to exist in version B.11.31.1403:
•
QXCR1001328356 — LRO may truncate/enlarge TCP frames causing TCP performance
degradation. The software LRO algorithm may try to coalesce an additional packet which
does not belong to the same TCP segment. This can causes packet discards. This is a rare
scenario involving a specific traffic pattern having TCP timestamps and sacks options. The
software LRO is enabled by default. Therefore, it is recommended you disable it by editing
/etc/rc.config.d/hpiexgbeconf and reboot the system.
To enable/disable software LRO manually use, enter: nwmgr -s –A drv_pr=on/off -c
lan
•
QXCR1001247823 — iexgbe driver intermittently stops collecting/incrementing link statistics
The iexgbe driver intermittently stops collecting and updating link statistics. This does not
affect data traffic; it only affects statistics. However, this can cause false link failure detection;
systems with MC/Serviceguard might exhibit a system Transfer Of Control (TOC), thereby
inhibiting Serviceguard recovery from a link outage or network connectivity problem.
Severity: Medium
Workaround: Resolve the problem by resetting the link. Statistics will then be collected and
updated properly.
•
Incorrect warning message after attempt to turn off Tx flow control for a Flex-10 interface
When an attempt is made to turn off Tx flow control for a Flex-10 interface, a warning message
indicates correctly that Tx flow control always stays on for Flex-10 interfaces; however, the
warning message displays the current value of Tx flow control as “Off” instead of “On”.
Severity: Minor
Workaround: Disregard the displayed state of Tx flow control.
12
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