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author | Eric Dumazet <edumazet@google.com> | 2020-04-30 10:35:41 -0700 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2020-04-30 13:24:01 -0700 |
commit | 2b195850128f5bafde177b12489d9fa27962cc1e (patch) | |
tree | bbb5e20a0e2c8cb06bb28d316d89b7b821672cdc /net/ipv6 | |
parent | 3857c776240f0edef8639d7833626ab2ee7c7723 (diff) |
tcp: add tp->dup_ack_counter
In commit 86de5921a3d5 ("tcp: defer SACK compression after DupThresh")
I added a TCP_FASTRETRANS_THRESH bias to tp->compressed_ack in order
to enable sack compression only after 3 dupacks.
Since we plan to relax this rule for flows that involve
stacks not requiring this old rule, this patch adds
a distinct tp->dup_ack_counter.
This means the TCP_FASTRETRANS_THRESH value is now used
in a single location that a future patch can adjust:
if (tp->dup_ack_counter < TCP_FASTRETRANS_THRESH) {
tp->dup_ack_counter++;
goto send_now;
}
This patch also introduces tcp_sack_compress_send_ack()
helper to ease following patch comprehension.
This patch refines LINUX_MIB_TCPACKCOMPRESSED to not
count the acks that we had to send if the timer expires
or tcp_sack_compress_send_ack() is sending an ack.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
0 files changed, 0 insertions, 0 deletions