diff options
| author |   Eric Dumazet <edumazet@google.com> | 2018-10-15 09:37:52 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-10-15 22:56:41 -0700 |
| commit | 5f6188a8003d080e3753b8f14f4a5a2325ae1ff6 (patch) | |
| tree | 17f35c12eeef92a69902b197a73c1123eaac9e63 /net/ipv4/tcp_timer.c | |
| parent | net: bridge: fix a possible memory leak in __vlan_add (diff) | |
| download | linux-dev-5f6188a8003d080e3753b8f14f4a5a2325ae1ff6.tar.xz linux-dev-5f6188a8003d080e3753b8f14f4a5a2325ae1ff6.zip | |
tcp: do not change tcp_wstamp_ns in tcp_mstamp_refresh
In EDT design, I made the mistake of using tcp_wstamp_ns
to store the last tcp_clock_ns() sample and to store the
pacing virtual timer.
This causes major regressions at high speed flows.
Introduce tcp_clock_cache to store last tcp_clock_ns().
This is needed because some arches have slow high-resolution
kernel time service.
tcp_wstamp_ns is only updated when a packet is sent.
Note that we can remove tcp_mstamp in the future since
tcp_mstamp is essentially tcp_clock_cache/1000, so the
apparent socket size increase is temporary.
Fixes: 9799ccb0e984 ("tcp: add tcp_wstamp_ns socket field")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_timer.c')
| -rw-r--r-- | net/ipv4/tcp_timer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index 61023d50cd60..676020663ce8 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -360,7 +360,7 @@ static void tcp_probe_timer(struct sock *sk) */ start_ts = tcp_skb_timestamp(skb); if (!start_ts) - skb->skb_mstamp_ns = tp->tcp_wstamp_ns; + skb->skb_mstamp_ns = tp->tcp_clock_cache; else if (icsk->icsk_user_timeout && (s32)(tcp_time_stamp(tp) - start_ts) > icsk->icsk_user_timeout) goto abort; |