We store in tcp socket a cache of most recent high resolution clock, there is no need to call local_clock() again, since this cache is good enough.
Signed-off-by: Eric Dumazet <eduma...@google.com> --- net/ipv4/tcp_cdg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/tcp_cdg.c b/net/ipv4/tcp_cdg.c index 06fbe102a425f28b43294925d8d13af4a13ec776..37eebd9103961be4731323cfb4d933b51954e802 100644 --- a/net/ipv4/tcp_cdg.c +++ b/net/ipv4/tcp_cdg.c @@ -146,7 +146,7 @@ static void tcp_cdg_hystart_update(struct sock *sk) return; if (hystart_detect & HYSTART_ACK_TRAIN) { - u32 now_us = div_u64(local_clock(), NSEC_PER_USEC); + u32 now_us = tp->tcp_mstamp; if (ca->last_ack == 0 || !tcp_is_cwnd_limited(sk)) { ca->last_ack = now_us; -- 2.19.0.605.g01d371f741-goog