diff options
| author |   David S. Miller <davem@davemloft.net> | 2018-05-18 11:40:28 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-18 11:40:28 -0400 |
| commit | 2c47a65b7009eb21f16f1d258b682ee38cff5186 (patch) | |
| tree | d2a2dfb4516b8fb0d8fe13e7c3bfa0eda2064d0d /include/linux | |
| parent | net: mscc: Add SPDX identifier (diff) | |
| parent | tcp: add tcp_comp_sack_nr sysctl (diff) | |
Merge branch 'tcp-implement-SACK-compression'
Eric Dumazet says:
====================
tcp: implement SACK compression
When TCP receives an out-of-order packet, it immediately sends
a SACK packet, generating network load but also forcing the
receiver to send 1-MSS pathological packets, increasing its
RTX queue length/depth, and thus processing time.
Wifi networks suffer from this aggressive behavior, but generally
speaking, all these SACK packets add fuel to the fire when networks
are under congestion.
This patch series adds SACK compression, but the infrastructure
could be leveraged to also compress ACK in the future.
v2: Addressed Neal feedback.
Added two sysctls to allow fine tuning, or even disabling the feature.
v3: take rtt = min(srtt, rcv_rtt) as Yuchung suggested, because rcv_rtt
can be over estimated for RPC (or sender limited)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/tcp.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 807776928cb8..72705eaf4b84 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -218,6 +218,7 @@ struct tcp_sock { reord:1; /* reordering detected */ } rack; u16 advmss; /* Advertised MSS */ + u8 compressed_ack; u32 chrono_start; /* Start time in jiffies of a TCP chrono */ u32 chrono_stat[3]; /* Time in jiffies for chrono_stat stats */ u8 chrono_type:2, /* current chronograph type */ @@ -297,6 +298,7 @@ struct tcp_sock { u32 sacked_out; /* SACK'd packets */ struct hrtimer pacing_timer; + struct hrtimer compressed_ack_timer; /* from STCP, retrans queue hinting */ struct sk_buff* lost_skb_hint; |