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[TCP]: Bound TSO defer time 

This patch limits the amount of time you will defer sending a TSO segment
to less than two clock ticks, or the time between two acks, whichever is
longer.

On slow links, deferring causes significant bursts.  See attached plots,
which show RTT through a 1 Mbps link with a 100 ms RTT and ~100 ms queue
for (a) non-TSO, (b) currnet TSO, and (c) patched TSO.  This burstiness
causes significant jitter, tends to overflow queues early (bad for short
queues), and makes delay-based congestion control more difficult.

Deferring by a couple clock ticks I believe will have a relatively small
impact on performance.

Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Heffner 2006-10-18 20:36:48 -07:00 committed by David S. Miller
parent b52f070c9c
commit ae8064ac32
2 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/tcp.h
View File

@ -342,6 +342,8 @@ struct tcp_sock {
unsigned long last_synq_overflow;
__u32 tso_deferred;
/* Receiver side RTT estimation */
struct {
__u32 rtt;

20
net/ipv4/tcp_output.c
View File

@ -1096,10 +1096,14 @@ static int tcp_tso_should_defer(struct sock *sk, struct tcp_sock *tp, struct sk_
u32 send_win, cong_win, limit, in_flight;
if (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN)
return 0;
goto send_now;
if (icsk->icsk_ca_state != TCP_CA_Open)
return 0;
goto send_now;
/* Defer for less than two clock ticks. */
if (!tp->tso_deferred && ((jiffies<<1)>>1) - (tp->tso_deferred>>1) > 1)
goto send_now;
in_flight = tcp_packets_in_flight(tp);
@ -1115,7 +1119,7 @@ static int tcp_tso_should_defer(struct sock *sk, struct tcp_sock *tp, struct sk_
/* If a full-sized TSO skb can be sent, do it. */
if (limit >= 65536)
return 0;
goto send_now;
if (sysctl_tcp_tso_win_divisor) {
u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache);
@ -1125,7 +1129,7 @@ static int tcp_tso_should_defer(struct sock *sk, struct tcp_sock *tp, struct sk_
*/
chunk /= sysctl_tcp_tso_win_divisor;
if (limit >= chunk)
return 0;
goto send_now;
} else {
/* Different approach, try not to defer past a single
* ACK. Receiver should ACK every other full sized
@ -1133,11 +1137,17 @@ static int tcp_tso_should_defer(struct sock *sk, struct tcp_sock *tp, struct sk_
* then send now.
*/
if (limit > tcp_max_burst(tp) * tp->mss_cache)
return 0;
goto send_now;
}
/* Ok, it looks like it is advisable to defer. */
tp->tso_deferred = 1 | (jiffies<<1);
return 1;
send_now:
tp->tso_deferred = 0;
return 0;
}
/* Create a new MTU probe if we are ready.