
DLSw Troubleshooting
114063 Rev. A C-17
File transfers with large
packets are slow.
1. DLSw uses more CPU
than SRB.
2. The TCP window size is
too small, causing RNRs at
source.
3. The TCP window size is
too large, causing latency
problems.
4. IP WAN frames are
fragmented.
5. TCP is transmitting too
many frames
1. Edit DLSw packaging
parameters; use protocol
prioritization and prioritize
SNA traffic over other
protocols.
2. TCP flow control is
limiting performance;
increase the TCP Window
Size parameter setting.
3. Critical data is being
buffered by TCP; decrease
the TCP Window Size
parameter setting and
check performance.
4. Set Virtual Ring MTU
parameter to less than the
WAN maximum transfer
unit.
5. 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-4. Common DLSw Problems
(continued)
Problem Possible Cause Action/Solution
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