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* tcp_nv: fix division by zero in tcpnv_acked()Konstantin Khlebnikov2017-11-021-1/+1
| | | | | | | | | Average RTT could become zero. This happened in real life at least twice. This patch treats zero as 1us. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by: Lawrence Brakmo <Brakmo@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* tcp: consolidate congestion control undo functionsYuchung Cheng2017-08-061-12/+1
| | | | | | | | | | | Most TCP congestion controls are using identical logic to undo cwnd except BBR. This patch consolidates these similar functions to the one used currently by Reno and others. Suggested-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* tcpnv: do not export local functionstephen hemminger2017-05-211-3/+2
| | | | | | | | | The TCP New Vegas congestion control was exporting an internal function tcpnv_get_info which is not used by any other in tree kernel code. Make it static. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* tcp: add NV congestion controlLawrence Brakmo2016-06-101-0/+476
TCP-NV (New Vegas) is a major update to TCP-Vegas. An earlier version of NV was presented at 2010's LPC. It is a delayed based congestion avoidance for the data center. This version has been tested within a 10G rack where the HW RTTs are 20-50us and with 1 to 400 flows. A description of TCP-NV, including implementation details as well as experimental results, can be found at: http://www.brakmo.org/networking/tcp-nv/TCPNV.html Signed-off-by: Lawrence Brakmo <brakmo@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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