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tcp_cubic: make hystart_ack_delay() aware of BIG TCP

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hystart_ack_delay() had the assumption that a TSO packet
would not be bigger than GSO_MAX_SIZE.

This will no longer be true.

We should use sk->sk_gso_max_size instead.

This reduces chances of spurious Hystart ACK train detections.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-05-13 11:33:59 -07:00 committed by David S. Miller
parent 34b92e8d19
commit 9957b38b5e
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/tcp_cubic.c
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@ -372,7 +372,7 @@ static void cubictcp_state(struct sock *sk, u8 new_state)
* We apply another 100% factor because @rate is doubled at this point.
* We cap the cushion to 1ms.
*/
static u32 hystart_ack_delay(struct sock *sk)
static u32 hystart_ack_delay(const struct sock *sk)
{
unsigned long rate;
@ -380,7 +380,7 @@ static u32 hystart_ack_delay(struct sock *sk)
if (!rate)
return 0;
return min_t(u64, USEC_PER_MSEC,
div64_ul((u64)GSO_MAX_SIZE * 4 * USEC_PER_SEC, rate));
div64_ul((u64)sk->sk_gso_max_size * 4 * USEC_PER_SEC, rate));
}
static void hystart_update(struct sock *sk, u32 delay)