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authorEric Dumazet <eric.dumazet@gmail.com>2011-10-20 16:53:56 -0400
committerDavid S. Miller <davem@davemloft.net>2011-10-20 16:54:51 -0400
commite9266a02b7e6542355431955075b4e688962fc0a (patch)
tree931d80e4cf840fc9ed036a3406799a546dda0518 /net
parent30d3c128eafd2277ca2bb4b62845f25ad9295c12 (diff)
downloadlinux-e9266a02b7e6542355431955075b4e688962fc0a.tar.bz2
tcp: use TCP_DEFAULT_INIT_RCVWND in tcp_fixup_rcvbuf()
Since commit 356f039822b (TCP: increase default initial receive window.), we allow sender to send 10 (TCP_DEFAULT_INIT_RCVWND) segments. Change tcp_fixup_rcvbuf() to reflect this change, even if no real change is expected, since sysctl_tcp_rmem[1] = 87380 and this value is bigger than tcp_fixup_rcvbuf() computed rcvmem (~23720) Note: Since commit 356f039822b limited default window to maximum of 10*1460 and 2*MSS, we use same heuristic in this patch. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_input.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1e848b26c2b9..e8e6d492f328 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -345,17 +345,24 @@ static void tcp_grow_window(struct sock *sk, struct sk_buff *skb)
static void tcp_fixup_rcvbuf(struct sock *sk)
{
- struct tcp_sock *tp = tcp_sk(sk);
- int rcvmem = SKB_TRUESIZE(tp->advmss + MAX_TCP_HEADER);
+ u32 mss = tcp_sk(sk)->advmss;
+ u32 icwnd = TCP_DEFAULT_INIT_RCVWND;
+ int rcvmem;
- /* Try to select rcvbuf so that 4 mss-sized segments
- * will fit to window and corresponding skbs will fit to our rcvbuf.
- * (was 3; 4 is minimum to allow fast retransmit to work.)
+ /* Limit to 10 segments if mss <= 1460,
+ * or 14600/mss segments, with a minimum of two segments.
*/
- while (tcp_win_from_space(rcvmem) < tp->advmss)
+ if (mss > 1460)
+ icwnd = max_t(u32, (1460 * TCP_DEFAULT_INIT_RCVWND) / mss, 2);
+
+ rcvmem = SKB_TRUESIZE(mss + MAX_TCP_HEADER);
+ while (tcp_win_from_space(rcvmem) < mss)
rcvmem += 128;
- if (sk->sk_rcvbuf < 4 * rcvmem)
- sk->sk_rcvbuf = min(4 * rcvmem, sysctl_tcp_rmem[2]);
+
+ rcvmem *= icwnd;
+
+ if (sk->sk_rcvbuf < rcvmem)
+ sk->sk_rcvbuf = min(rcvmem, sysctl_tcp_rmem[2]);
}
/* 4. Try to fixup all. It is made immediately after connection enters