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authorHerbert Xu <herbert@gondor.apana.org.au>2005-09-22 23:32:56 -0700
committerDavid S. Miller <davem@davemloft.net>2005-09-22 23:32:56 -0700
commit83ca28befc43e93849e79c564cda10e39d983e75 (patch)
treeb86c768738f929246e4a0f858f8f6df88c015da8 /net/bridge
parente484585ec3ee66cd07a627d3a9e2364640a3807f (diff)
[TCP]: Adjust Reno SACK estimate in tcp_fragment
Since the introduction of TSO pcount a year ago, it has been possible for tcp_fragment() to cause packets_out to decrease. Prior to that, tcp_retrans_try_collapse() was the only way for that to happen on the retransmission path. When this happens with Reno, it is possible for sasked_out to become invalid because it is only an estimate and not tied to any particular packet on the retransmission queue. Therefore we need to adjust sacked_out as well as left_out in the Reno case. The following patch does exactly that. This bug is pretty difficult to trigger in practice though since you need a SACKless peer with a retransmission that occurs just as the cached MTU value expires. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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