Messages in this thread | | | Date | Wed, 26 Nov 2003 13:39:54 -0500 (EST) | From | John Heffner <> | Subject | Re: Linux TCP state machine is broken? |
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On Wed, 26 Nov 2003, Yogesh Swami wrote:
> I think the reason the sender is always in TCP_CA_CWR > and not in TCP_CA_Open is because in the function > "tcp_transmit_skb" (tcp_out.c:190), after sending the > packet to IP-layer, the sender call tcp_enter_cwr() if > the IP layer did not return any non congestion error. > I have put the code fragement at the end of the > e-mail. > > I am not clear why a successfuly transmission should > cause the sender to enter CWR (the only other places > when tcp_enter_cwr is called are when there is a ICMP > source quench or when there is ECE bit set for ECN). > > If someone could explain this to me, that would be > great.
It reaches this point if there *is* congestion explicitly reported by the interface. It will be in CWR a lot of the time if your local interface is the bottleneck.
-John
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