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tcp: remove conditional branches from tcp_mstamp_refresh() 

tcp_clock_ns() (aka ktime_get_ns()) is using monotonic clock,
so the checks we had in tcp_mstamp_refresh() are no longer
relevant.

This patch removes cpu stall (when the cache line is not hot)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.2
Eric Dumazet 2019-03-22 06:26:29 -07:00 committed by David S. Miller
parent a7a01ab312
commit e6d1407013
1 changed files with 2 additions and 6 deletions
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8
net/ipv4/tcp_output.c
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@ -52,12 +52,8 @@ void tcp_mstamp_refresh(struct tcp_sock *tp)
{
u64 val = tcp_clock_ns();
if (val > tp->tcp_clock_cache)
tp->tcp_clock_cache = val;
val = div_u64(val, NSEC_PER_USEC);
if (val > tp->tcp_mstamp)
tp->tcp_mstamp = val;
tp->tcp_clock_cache = val;
tp->tcp_mstamp = div_u64(val, NSEC_PER_USEC);
}
static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,