README.irix

Some notes for the IRIX port
============================

1. Compiling
------------

net-snmp 5.3.1 and later have been compiled successfully on IRIX 6.5 using the 
MIPSpro C compiler 7.4.4m in C99 mode:

	CC=c99 ./configure && make && make install

Please note that the "host" module doesn't compile on IRIX, so you *cannot*
configure with "--with-mib-modules=host".

Compiling with gcc may be possible, but is unsupported at this point in time
due to difficulties with the IRIX system headers. Brent Bice has reported
a successful build of net-snmp 5.4 with gcc 3.4.6 on a IP30 machine using:

	CFLAGS="-D_PAGESZ=16384 -D_MIPS3_ADDRSPACE -DIP30 -DR10000 -DMP \
	        -DCELL_PREPARE -DBHV_PREPARE" ./configure ...

See http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/0620/bks/\
SGI_Developer/books/DevDriver_PG/sgi_html/ch10.html and 
/var/sysgen/Makefile.kernio .

2. CPU stats
------------

net-snmp 5.4.1 and later reports CPU statistics on IRIX 6.x by default using 
the hardware/cpu/cpu_sysinfo module. There's also an alternative implementation:
hardware/cpu/cpu_pcp. For full discussion and build instructions for cpu_pcp
see Patch #1675869: 

  http://sf.net/support/tracker.php?aid=1675869


3. Perl
-------

When compiling with Perl support, it's recommended to specify

  ./configure --enable-as-needed

for proper libperl linking.


4. Known Issues
---------------

Accessing certain MIB objects on IRIX64 machines (i.e. when running a 64-bit 
kernel will trigger nlist/klookup errors. The agent will not return proper 
values for the affected MIB objects (e.g. tcpConnTable, udpTable). 
Starting from net-snmp 5.4, you can avoid nlist altogether (recommended for 
IRIX64) by using

   ./configure --without-kmem-usage ...


5. Feedback
-----------

Please also see README and PORTING.

If you have questions, additional insights or (even better) patches regarding
net-snmp on IRIX, please refer to the net-snmp mailing lists (see 
http://www.net-snmp.org/lists).