/sys$common/syshlp/helplib.hlb TCPTRACE, Qualifiers, /BUFFERS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /BUFFERS=n

    Optional. Default: 100.

    Number of buffers that TCPTRACE allocates for temporary storage.
    These buffers must be locked into the process working set, so
    you may have to decrease the number to accomodate the working
    set size or increase the number to prevent TCPTRACE from dropping
    packets.