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[TCP]: Do not purge sk_forward_alloc entirely in tcp_delack_timer().

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Otherwise we beat heavily on the global tcp_memory atomics
when all of the sockets in the system are slowly sending
perioding packet clumps.

Noticed and suggested by Eric Dumazet.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-01-10 21:56:38 -08:00
parent e186932b3d
commit 9993e7d313
2 changed files with 9 additions and 1 deletions
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8
include/net/sock.h
View file

@ -759,6 +759,14 @@ static inline void sk_mem_reclaim(struct sock *sk)
__sk_mem_reclaim(sk);
}
static inline void sk_mem_reclaim_partial(struct sock *sk)
{
if (!sk_has_account(sk))
return;
if (sk->sk_forward_alloc > SK_MEM_QUANTUM)
__sk_mem_reclaim(sk);
}
static inline void sk_mem_charge(struct sock *sk, int size)
{
if (!sk_has_account(sk))

2
net/ipv4/tcp_timer.c
View file

@ -186,7 +186,7 @@ static void tcp_delack_timer(unsigned long data)
goto out_unlock;
}
sk_mem_reclaim(sk);
sk_mem_reclaim_partial(sk);
if (sk->sk_state == TCP_CLOSE || !(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
goto out;