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authorAlexey Kuznetsov <kuznet@ms2.inr.ac.ru>2005-09-29 17:17:15 -0700
committerDavid S. Miller <davem@davemloft.net>2005-09-29 17:17:15 -0700
commit09e9ec87111ba818d8171262b15ba4c357eb1d27 (patch)
tree1ca234c19a12ca88879441d10b83fe317a586d2f
parent01ff367e62f0474e4d39aa5812cbe2a30d96e1e9 (diff)
[TCP]: Don't over-clamp window in tcp_clamp_window()
From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Handle better the case where the sender sends full sized frames initially, then moves to a mode where it trickles out small amounts of data at a time. This known problem is even mentioned in the comments above tcp_grow_window() in tcp_input.c, specifically: ... * The scheme does not work when sender sends good segments opening * window and then starts to feed us spagetti. But it should work * in common situations. Otherwise, we have to rely on queue collapsing. ... When the sender gives full sized frames, the "struct sk_buff" overhead from each packet is small. So we'll advertize a larger window. If the sender moves to a mode where small segments are sent, this ratio becomes tilted to the other extreme and we start overrunning the socket buffer space. tcp_clamp_window() tries to address this, but it's clamping of tp->window_clamp is a wee bit too aggressive for this particular case. Fix confirmed by Ion Badulescu. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/tcp_input.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a7537c7bbd0..677419d0c9a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -355,8 +355,6 @@ static void tcp_clamp_window(struct sock *sk, struct tcp_sock *tp)
app_win -= icsk->icsk_ack.rcv_mss;
app_win = max(app_win, 2U*tp->advmss);
- if (!ofo_win)
- tp->window_clamp = min(tp->window_clamp, app_win);
tp->rcv_ssthresh = min(tp->window_clamp, 2U*tp->advmss);
}
}