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-rw-r--r--include/net/tcp.h3
-rw-r--r--net/ipv4/tcp_output.c11
2 files changed, 11 insertions, 3 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index b4480300cad..38509f04738 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -60,6 +60,9 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
*/
#define MAX_TCP_WINDOW 32767U
+/* Offer an initial receive window of 10 mss. */
+#define TCP_DEFAULT_INIT_RCVWND 10
+
/* Minimal accepted MSS. It is (60+60+8) - (20+20). */
#define TCP_MIN_MSS 88U
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 2d390669d40..dc7c096ddfe 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -228,10 +228,15 @@ void tcp_select_initial_window(int __space, __u32 mss,
}
}
- /* Set initial window to value enough for senders, following RFC5681. */
+ /* Set initial window to a value enough for senders starting with
+ * initial congestion window of TCP_DEFAULT_INIT_RCVWND. Place
+ * a limit on the initial window when mss is larger than 1460.
+ */
if (mss > (1 << *rcv_wscale)) {
- int init_cwnd = rfc3390_bytes_to_packets(mss);
-
+ int init_cwnd = TCP_DEFAULT_INIT_RCVWND;
+ if (mss > 1460)
+ init_cwnd =
+ max_t(u32, (1460 * TCP_DEFAULT_INIT_RCVWND) / mss, 2);
/* when initializing use the value from init_rcv_wnd
* rather than the default from above
*/