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tcp: cdg: use tcp high resolution clock cache 

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 <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2018-10-15 09:37:58 -07:00 committed by David S. Miller
parent 97ec3eb33d
commit 825e1c523d
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_cdg.c
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@ -146,7 +146,7 @@ static void tcp_cdg_hystart_update(struct sock *sk)
return; return;
if (hystart_detect & HYSTART_ACK_TRAIN) { 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)) { if (ca->last_ack == 0 || !tcp_is_cwnd_limited(sk)) {
ca->last_ack = now_us; ca->last_ack = now_us;