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| author | Eric Dumazet <edumazet@google.com> | 2013-09-24 08:20:52 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-09-28 15:35:41 -0700 |
| commit | 62748f32d501f5d3712a7c372bbb92abc7c62bc7 (patch) | |
| tree | 847a6e4b66aaf012809ff8656476743e738f1a2b /net/ipv4/tcp_input.c | |
| parent | 4aa0a03f519812f48ac48d046bc451e97649ec82 (diff) | |
| download | op-kernel-dev-62748f32d501f5d3712a7c372bbb92abc7c62bc7.zip op-kernel-dev-62748f32d501f5d3712a7c372bbb92abc7c62bc7.tar.gz | |
net: introduce SO_MAX_PACING_RATE
As mentioned in commit afe4fd062416b ("pkt_sched: fq: Fair Queue packet
scheduler"), this patch adds a new socket option.
SO_MAX_PACING_RATE offers the application the ability to cap the
rate computed by transport layer. Value is in bytes per second.
u32 val = 1000000;
setsockopt(sockfd, SOL_SOCKET, SO_MAX_PACING_RATE, &val, sizeof(val));
To be effectively paced, a flow must use FQ packet scheduler.
Note that a packet scheduler takes into account the headers for its
computations. The effective payload rate depends on MSS and retransmits
if any.
I chose to make this pacing rate a SOL_SOCKET option instead of a
TCP one because this can be used by other protocols.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 5d08385..66aa816 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -735,7 +735,7 @@ static void tcp_update_pacing_rate(struct sock *sk) if (tp->srtt > 8 + 2) do_div(rate, tp->srtt); - sk->sk_pacing_rate = min_t(u64, rate, ~0U); + sk->sk_pacing_rate = min_t(u64, rate, sk->sk_max_pacing_rate); } /* Calculate rto without backoff. This is the second half of Van Jacobson's |
