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IRIX Base Documentation 1998 November
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IRIX 6.5.2 Base Documentation November 1998.img
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1998-11-02
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5. _K_n_o_w_n__P_r_o_b_l_e_m_s__a_n_d__W_o_r_k_a_r_o_u_n_d_s
This chapter discusses known problems in IRIX 6.5 and ways
to work around them.
+o Programs built o32 running on desktop platforms
released since Irix 6.2 (O2 and OCTANEs) and with
default system configuration, may be returned values of
0x80000000 for resource limits RLIMIT_DATA and
RLIMIT_VMEM from a call to getlimit(). However,
setrlimit() will reject this value as invalid.
o32 programs do not suffer from this problem on any
other platform. n32 programs are not affected by this
problem.
The workaround is to use systune to reduce the
associated default values.
This problem affects systems with CPU types IP26, IP28,
IP30, or IP32.
+o The Qlogic SCSI controller is not capable of operating
at synchronous speeds of 300ns or more per cycle. If
you have a slow scsi device that is capable of
synchronous negotiations but at 300 ns period or
greater you must disable synchronous negotiations for
that device. You can disable sync for the whole bus by
using the DEVICE_ADMIN directive in
/var/sysgen/system/irix.sm. For example, to disable
sync on the external SCSI bus on an OCTANE system, add
the following line to irix.sm and then run
autoconfig(1M) and reboot the system:
DEVICE_ADMIN: /hw/node/xtalk/15/pci/1/scsi_ctlr/0 ql_sync_enable=0
+o The XFS Guaranteed Rate I/O (GRIO) feature contained in
eoe.sw.xfsrt can be used to access "real-time" files.
The GRIO API has undergone changes since IRIX 6.2, and
are described in the grio(1M), grio_bandwidth(1M),
grio(5), grio_disks(4) and associated man pages.
+o Deleting ip aliases can cause kernel panics. The
workaround is not to delete them.
+o The system automatically mounts a pseudo-filesystem
called /_h_w. This file system should never be unmounted
(i.e. _u_m_o_u_n_t -_a should be used with caution). The
command /_e_t_c/_m_n_t_h_w_g_f_s can be used to remount /_h_w if
necessary. See _h_w_g_f_s(4) for more information.
- 2 -
+o Use of file-locking operations on fifos can cause a
panic.
+o fsr (the EFS filesystem reoganizer) will get into an
infinite loop when it encounters an EFS filesystem on
an XLV volume. You can avoid the problem by removing
the rw option from the fstab entry for the affected
filesystem(s), see the fsr(1M) manual page. This
disables fsr for the filesystem.
+o OCTANE and Origin/Onyx2 systems have IBM(R) PC/AT(tm)-
like DB-9 male serial port connectors. Some existing
serial devices, such as Dial and Button boxes, have
male DB-9 serial connectors. These connectors are
designed for the DB-9 female serial port connectors
found on the CHALLENGE and Onyx systems. The
difference is not merely in the gender of the
connectors; the pinout is different, and a conversion
cable is required to connect devices with the older
connectors to the newer systems. See the serial(7) man
page for the pinouts of the CHALLENGE/Onyx and
OCTANE/Origin/Onyx2 connectors, which can be used to
create a conversion cable.
Recently shipped versions of some devices (including
Dial and Button boxes) may have PC/AT(tm)-like DB-9
female serial port connectors that will connect
directly to OCTANE and Origin/Onyx2 systems.
+o OCTANE Duo systems will need check to make sure the
appropriate Xservers file is on the system. Use
"versions changed" (see versions(1M)) to check for the
previous version of Xservers (will be Xservers.O).
Compare the Xservers.O with the new Xservers.2key to
check for any changes or additions. Without the
appropriate Xservers file the second head on the OCTANE
Duo system will not be activated. Please see your
OCTANE Duo Installation Guide for additional details.
+o On Onyx2, Origin2000, and OCTANE systems with Reality,
InfinteReality, InfiniteReality2, SI, SSI, or MXI
graphics, real-time determinism breaks when the X
server is terminated. Avoid terminating the X server
when real-time determinism is required.
If the X server must be terminated while real-time
deteminism is required, a workaround for Onyx2 and
Origin2000 systems with Reality and InfiniteReality,
and InfiniteReality2 graphics can be used. Set the
non-volitile RAM's console variable to "d," directing
console output out the console serial port instead of
- 3 -
the graphics display.
No workaround exists for OCTANE systems and Origin2000
systems with SI, SSI, or MXI graphics.