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tcp: do not scale TSO segment size with reordering degree

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Since 2005 (c1b4a7e695)
tcp_tso_should_defer has been using tcp_max_burst() as a target limit
for deciding how large to make outgoing TSO packets when not using
sysctl_tcp_tso_win_divisor. But since 2008
(dd9e0dda66) tcp_max_burst() returns the
reordering degree. We should not have tcp_tso_should_defer attempt to
build larger segments just because there is more reordering. This
commit splits the notion of deferral size used in TSO from the notion
of burst size used in cwnd moderation, and returns the TSO deferral
limit to its original value.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neal Cardwell 2011-11-21 17:15:14 +00:00 committed by David S. Miller
parent befc93fe76
commit 6b5a5c0dbb
3 changed files with 10 additions and 2 deletions
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8
include/net/tcp.h
View File

@ -834,6 +834,14 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
extern __u32 tcp_init_cwnd(const struct tcp_sock *tp, const struct dst_entry *dst);
/* The maximum number of MSS of available cwnd for which TSO defers
* sending if not using sysctl_tcp_tso_win_divisor.
*/
static inline __u32 tcp_max_tso_deferred_mss(const struct tcp_sock *tp)
{
return 3;
}
/* Slow start with delack produces 3 packets of burst, so that
* it is safe "de facto". This will be the default - same as
* the default reordering threshold - but if reordering increases,

2
net/ipv4/tcp_cong.c
View File

@ -292,7 +292,7 @@ int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd &&
left * tp->mss_cache < sk->sk_gso_max_size)
return 1;
return left <= tcp_max_burst(tp);
return left <= tcp_max_tso_deferred_mss(tp);
}
EXPORT_SYMBOL_GPL(tcp_is_cwnd_limited);

2
net/ipv4/tcp_output.c
View File

@ -1581,7 +1581,7 @@ static int tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb)
* frame, so if we have space for more than 3 frames
* then send now.
*/
if (limit > tcp_max_burst(tp) * tp->mss_cache)
if (limit > tcp_max_tso_deferred_mss(tp) * tp->mss_cache)
goto send_now;
}