Last Modified: Oct 17, 2023
Affected Product(s):
BIG-IP All
Known Affected Versions:
11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2
Fixed In:
13.0.0, 12.1.2 HF1, 11.6.3.3, 11.5.7
Opened: Apr 25, 2016 Severity: 3-Major Related Article:
K33191529
With Nagle disabled, TCP does not send all of xfrags with size greater than MSS.
Additional connection latency.
Congestion window is small relative to message size; abc is enabled; also might manifest when serverside MTU is greater than clientside MTU.
Enabling proxy-mss on the serverside TCP profile significantly reduces incidence of this problem in observed cases. If init-cwnd is low, raising it might also help. Disabling abc can also reduce the problem, but might have other negative network implications.
Incoming packets are now pulled more aggressively into the send buffer, if there are no negative implications for CPU performance.