net: Add rtnetlink init_rcvwnd to set the TCP initial receive window
Add rtnetlink init_rcvwnd to set the TCP initial receive window size
advertised by passive and active TCP connections.
The current Linux TCP implementation limits the advertised TCP initial
receive window to the one prescribed by slow start. For short lived
TCP connections used for transaction type of traffic (i.e. http
requests), bounding the advertised TCP initial receive window results
in increased latency to complete the transaction.
Support for setting initial congestion window is already supported
using rtnetlink init_cwnd, but the feature is useless without the
ability to set a larger TCP initial receive window.
The rtnetlink init_rcvwnd allows increasing the TCP initial receive
window, allowing TCP connection to advertise larger TCP receive window
than the ones bounded by slow start.
Signed-off-by: Laurent Chavey <chavey@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 12b2af3..4a1605d 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -183,7 +183,8 @@
*/
void tcp_select_initial_window(int __space, __u32 mss,
__u32 *rcv_wnd, __u32 *window_clamp,
- int wscale_ok, __u8 *rcv_wscale)
+ int wscale_ok, __u8 *rcv_wscale,
+ __u32 init_rcv_wnd)
{
unsigned int space = (__space < 0 ? 0 : __space);
@@ -232,7 +233,13 @@
init_cwnd = 2;
else if (mss > 1460)
init_cwnd = 3;
- if (*rcv_wnd > init_cwnd * mss)
+ /* when initializing use the value from init_rcv_wnd
+ * rather than the default from above
+ */
+ if (init_rcv_wnd &&
+ (*rcv_wnd > init_rcv_wnd * mss))
+ *rcv_wnd = init_rcv_wnd * mss;
+ else if (*rcv_wnd > init_cwnd * mss)
*rcv_wnd = init_cwnd * mss;
}
@@ -2417,7 +2424,8 @@
&req->rcv_wnd,
&req->window_clamp,
ireq->wscale_ok,
- &rcv_wscale);
+ &rcv_wscale,
+ dst_metric(dst, RTAX_INITRWND));
ireq->rcv_wscale = rcv_wscale;
}
@@ -2544,7 +2552,8 @@
&tp->rcv_wnd,
&tp->window_clamp,
sysctl_tcp_window_scaling,
- &rcv_wscale);
+ &rcv_wscale,
+ dst_metric(dst, RTAX_INITRWND));
tp->rx_opt.rcv_wscale = rcv_wscale;
tp->rcv_ssthresh = tp->rcv_wnd;
