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| author | Ali Saidi <saidi@engin.umich.edu> | 2008-10-08 00:31:19 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-10-08 00:31:19 +0200 |
| commit | 53240c208776d557dba9d7afedbcdbf512774c16 (patch) | |
| tree | b47429ecaf4ea004857e5464cf0612cbd06081c7 /Documentation/java.txt | |
| parent | net: only invoke dev->change_rx_flags when device is UP (diff) | |
| download | linux-53240c208776d557dba9d7afedbcdbf512774c16.tar.xz linux-53240c208776d557dba9d7afedbcdbf512774c16.zip | |
tcp: Fix possible double-ack w/ user dma
From: Ali Saidi <saidi@engin.umich.edu>
When TCP receive copy offload is enabled it's possible that
tcp_rcv_established() will cause two acks to be sent for a single
packet. In the case that a tcp_dma_early_copy() is successful,
copied_early is set to true which causes tcp_cleanup_rbuf() to be
called early which can send an ack. Further along in
tcp_rcv_established(), __tcp_ack_snd_check() is called and will
schedule a delayed ACK. If no packets are processed before the delayed
ack timer expires the packet will be acked twice.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/java.txt')
0 files changed, 0 insertions, 0 deletions