Maybe you will get by with 1MB of RAM, but I believe that if you have
more than one meg that the unit will most likely use the memory. I have
two PM2e's that are configured with the 5BRI modules and was seeing some
problems with various allocations (I don't recall the exact messages off
the top of my head), but when I jumped from 3.3.1 to 3.3.2bx it seemed to
get worse. I then looked at the memory using the 'sho mem' command to
find that all RAM appeared to allocated with 0 bytes available. So I
decided to upgrade the two units with ISDN from 1 to 4 MB. Here is what
a current display of the two units reveals:
pm1> ver
Livingston Enterprises PortMaster Version 3.3.2b4
System uptime is 7 days 8 hours 19 minutes
pm1> sho mem
System memory 4194304 bytes - 1039908 used, 3154396 available
2832:1 112:2 176:2 1152:1 640:1 64:0 2048:13 80:43 96:1 272:9 128:18 144:15 16:145 160:14 208:1 32:43
System nbufs 1400 - 101 used, 1299 available
pm1> quit
pm2> ver
Livingston Enterprises PortMaster Version 3.3.2b4
System uptime is 7 days 8 hours 14 minutes
pm2> sho mem
System memory 4194304 bytes - 1028836 used, 3165468 available
112:0 2832:3 176:2 1152:0 640:0 64:0 2048:9 80:33 96:1 128:10 272:5 144:9 16:107 160:10 48:0 208:1 32:35
System nbufs 1400 - 52 used, 1348 available
pm2> quit
Now it doesn't look like it's using much over 1MB, but I would say that it
is at least breaking this boundary. Also I don't know what happened, and
maybe it was chance, but after upgrading to 4MB I haven't seen any of the
errors that led to periodic PANIC reboots by the PM2e's that have the ISDN
adapters. As cheep as RAM is currently, it's sure no big deal to feed
them 4MB and sit on the safe side of things...
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