tcp_cubic: limit delayed_ack ratio to prevent divide error

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TCP Cubic keeps a metric that estimates the amount of delayed
acknowledgements to use in adjusting the window. If an abnormally
large number of packets are acknowledged at once, then the update
could wrap and reach zero. This kind of ACK could only
happen when there was a large window and huge number of
ACK's were lost.

This patch limits the value of delayed ack ratio. The choice of 32
is just a conservative value since normally it should be range of
1 to 4 packets.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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stephen hemminger 2011-05-04 10:04:56 +00:00 • committed by David S. Miller

parent 9c412942a0

commit b9f47a3aae

1 changed files with 7 additions and 2 deletions

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net/ipv4/tcp_cubic.c

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