"Georges Heinesch" <geohei-ml@geohei.lu> writes: 
>     options    SERIBUF_SIZE=1000000 /* one million !!! */

  Unless you are getting "ring buffer overflows" [not "silo overflow"],
changing SERIBUF_SIZE is very unlikely to have any effect.

Michael
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Michael L. Hitch                        mhitch@montana.edu
Computer Consultant,  Information Technology Center
Montana State University, Bozeman, MT     USA