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When Appropriate Byte Counting is enabled (the default), TCP's congestion window increases slower in slow-start when the data receiver sends stretch ACKs.
ABC limits the increase of congestion window by 2*MSS bytes per ACK. TCP's congestion window is increased slower in slow-start, which may lead to longer transfer times.
-- TCP data sender receives stretch ACKs (ACKs that acknowledges more than 2*MSS bytes of data). -- Appropriate Byte Counting (ABC) is enabled in slow-start.
There is no workaround at this time.
A new sys db (TM.TcpABCssLimit) is provided to set TCP's ABC limit (the default is 2*MSS) on increasing congestion window per ACK. With a larger limit (default is 2*MSS), TCP's congestion window increases faster in slow-start when stretch ACKs are received. If the data receiver sends regular ACKs/delayed ACKs, this setting has no impact.
There is a new db variable, TM.TcpABCssLimit for specifying TCP's ABC limit (the default is 2*MSS) on increasing congestion window per ACK. With a larger limit (default is 2*MSS), TCP's congestion window increases faster in slow-start when stretch ACKs are received. Note: If the data receiver sends regular ACKs/delayed ACKs, this setting has no impact.
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