Recommendation for APPL pacing option
The VPACING option of the APPL statement determines the maximum number of RUs that another LU can send, on a session, to this LU. When the maximum number of RUs is sent, the other LU waits to receive a pacing response.
Specify a nonzero value for this option unless you want to turn off all pacing for all sessions that are affected by this option.
Recommendation: Start with a value of
2 for both communicating systems. This pacing size is the same in
both directions for all modes.
The VPACING value is used with the RUSIZES option of the MODEENT macro to control the pacing window size. Thus, if VPACING is 2 and RUSIZES is 4–KB (X'8989'), then about 2 × 4KB = 8KB are sent before waiting to receive a pacing response. You should verify that your VTAM® buffer pools are large enough to accommodate the chosen pacing and RU sizes.