
Troubleshooting DLSw
303523-A Rev. 00
C-19
File transfers with large
packets are slow.
DLSw uses more CPU than
SRB.
The TCP window size is too
small, causing RNRs at the
source.
The TCP window size is too
large, causing latency
problems.
IP WAN frames are
fragmented.
TCP is transmitting too
many frames
Edit DLSw packaging
parameters; use protocol
prioritization and prioritize
SNA traffic over other
protocols.
TCP flow control is limiting
performance; increase the
TCP Window Size
parameter setting.
Critical data is being
buffered by TCP; decrease
the TCP Window Size
parameter setting and check
performance.
Set the Virtual Ring MTU
parameter to less than the
WAN maximum transfer
unit.
Decrease the TCP Window
Size parameter setting and
check performance.
The Response time is
slower than normal.
The TCP window size is too
large.
Decrease the TCP Window
Size parameter setting and
check performance.
Table C-5. Common DLSw Problems
(continued)
Problem Possible Cause Action/Solution
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