NCB Performance and Piggybackacks (90180)
This article was previously published under Q90180
SUMMARY
On file servers and workstations that are heavily used, be sure that
PIGGYBACKACKS is set to 1 (default value, ON). When "piggybacked"
acknowledgments are used, a computer that receives a request for data
can send an acknowledgment of the request and the data itself in the
same frame, cutting down on network traffic overhead. Using
piggybacked acknowledgments increases file-transfer performance.
MORE INFORMATION
Tests indicate poor performance when you send data in one direction
only or do a very simple send-wait-receive ping-pong with piggybackack
turned on. This occurs because the receiving NetBEUI stack does not
send its acknowledgment until the T2 timer pop, thus slowing the
network traffic.
By turning PIGGYBACKACKS off, these tests perform as expected.
In real-world scenarios, PIGGYBACKACKS should be left on. In most
cases, data is transferred in both directions and is not contingent on
the completion of an earlier request.
Turning PIGGYBACKACKS off will result in higher network traffic and
degraded performance.
| Modification Type: |
Major |
Last Reviewed: |
7/30/2001 |
| Keywords: |
KB90180 |
|