[TCP]: Reduce sacked_out with reno when purging write_queue

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Previously TCP had a transitional state during which reno
counted segments that are already below the current window into
sacked_out, which is now prevented. In addition, re-try now
the unconditional S+L skb catching.

This approach conservatively calls just remove_sack and leaves
reset_sack() calls alone. The best solution to the whole problem
would be to first calculate the new sacked_out fully (this patch
does not move reno_sack_reset calls from original sites and thus
does not implement this). However, that would require very
invasive change to fastretrans_alert (perhaps even slicing it to
two halves). Alternatively, all callers of tcp_packets_in_flight
(i.e., users that depend on sacked_out) should be postponed
until the new sacked_out has been calculated but it isn't any
simpler alternative.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Ilpo Järvinen 2007-08-09 14:53:36 +03:00 • committed by David S. Miller

parent d02596e329

commit 1b6d427bb7

2 changed files with 8 additions and 10 deletions

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3

include/net/tcp.h

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15

net/ipv4/tcp_input.c

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