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| author | Neal Cardwell <ncardwell@google.com> | 2011-11-16 08:58:03 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-27 18:54:09 -0500 |
| commit | e95ae2f2cf10f7bf27b492aa6188f3cd745de162 (patch) | |
| tree | 2808047891b1c8e3eae559c55d09a5cfeef79fdb /drivers/scsi | |
| parent | 5628adf1a0ff39b9e76e1a8e1c94dadabfd46914 (diff) | |
| download | linux-e95ae2f2cf10f7bf27b492aa6188f3cd745de162.tar.bz2 | |
tcp: use SACKs and DSACKs that arrive on ACKs below snd_una
The bug: When the ACK field is below snd_una (which can happen when
ACKs are reordered), senders ignored DSACKs (preventing undo) and did
not call tcp_fastretrans_alert, so they did not increment
prr_delivered to reflect newly-SACKed sequence ranges, and did not
call tcp_xmit_retransmit_queue, thus passing up chances to send out
more retransmitted and new packets based on any newly-SACKed packets.
The change: When the ACK field is below snd_una (the "old_ack" goto
label), call tcp_fastretrans_alert to allow undo based on any
newly-arrived DSACKs and try to send out more packets based on
newly-SACKed packets.
Other patches in this series will provide other changes that are
necessary to fully fix this problem.
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/scsi')
0 files changed, 0 insertions, 0 deletions