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tcp: Limit TCP_INFO getsockopt() syscalls

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There's no need to constantly query the socket for number of
acknowledged bytes if we're far from exhausting the sending window,
just do it if we're at least down to 90% of it.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-07-27 00:50:53 +02:00
parent d372c42460
commit fd5050ccba
1 changed files with 2 additions and 1 deletions
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3
tcp.c
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@ -1075,13 +1075,14 @@ static void tcp_rst(struct ctx *c, struct tcp_tap_conn *conn);
static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn,
int flags, char *in, int len) int flags, char *in, int len)
{ {
uint32_t ack_offset = conn->seq_from_tap - conn->seq_ack_to_tap;
char buf[USHRT_MAX] = { 0 }, *data; char buf[USHRT_MAX] = { 0 }, *data;
struct tcp_info info = { 0 }; struct tcp_info info = { 0 };
socklen_t sl = sizeof(info); socklen_t sl = sizeof(info);
struct tcphdr *th; struct tcphdr *th;
int ws = 0, err; int ws = 0, err;
if (conn->seq_from_tap == conn->seq_ack_to_tap && !flags && len) { if (ack_offset < conn->tcpi_snd_wnd / 10 && !flags) {
err = 0; err = 0;
info.tcpi_bytes_acked = conn->tcpi_acked_last; info.tcpi_bytes_acked = conn->tcpi_acked_last;
info.tcpi_snd_wnd = conn->tcpi_snd_wnd; info.tcpi_snd_wnd = conn->tcpi_snd_wnd;