bin@primate.wisc.edu (Brain in Neutral) (03/18/90)
Ultrix 3.1, VAX 8200 Message on console: dhu2: line 2: recv: fifo overflow and machine is locked up. Not crashed, but inert. What's it mean? Anything I can do about it? Paul DuBois Internet: dubois@primate.wisc.edu UUCP: rhesus!dubois FAX: 608/263-4031
grr@cbmvax.commodore.com (George Robbins) (03/19/90)
In article <1895@uakari.primate.wisc.edu> bin@primate.wisc.edu (Brain in Neutral) writes: > > Ultrix 3.1, VAX 8200 > > Message on console: > > dhu2: line 2: recv: fifo overflow > > and machine is locked up. Not crashed, but inert. > > What's it mean? Anything I can do about it? FIFO overflow means that the serial interface received characters at a greater aggregate rate than the CPU could process them and the FIFO (aka SILO) in the interface filled up. It is possible that your system was already "hung" and the FIFO overflow message was merely an "interrupt level" admission that things had gone South. The more normal indication is that either you have too many "fast" serial input lines (like Trailblazer) modems on one interface or that your CPU isn't fast enough for what you're asking of it. If this is the case you can try changing the arrangement of your serial lines or adding additional interaces to improve the total FIFO capacity. I used to see lots of these type of messages on my 785 - as many as a hundred a day. On a DMF-32, they caused no system level problems, just a bunch of uucp retries. On a DH11 some kind of driver bug leads to memory corruption and daily crashes. I haven't seen any of these messasges on my new 5810 w/DMB32... -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)