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authorSeymour, Shane M <shane.seymour@hpe.com>2016-06-28 23:06:48 +0000
committerDavid S. Miller <davem@davemloft.net>2016-06-30 08:17:21 -0400
commit2631b79f6cb8b634fe41b77de9c4add0ec6b3cae (patch)
treeaa9f2dde1f090f20fbe28e555c41d4f36d7409c4
parentb1ed4c4fa9a5ccf325184fd90edc50978ef6e33a (diff)
tcp: increase size at which tcp_bound_to_half_wnd bounds to > TCP_MSS_DEFAULT
In previous commit 01f83d69844d307be2aa6fea88b0e8fe5cbdb2f4 the following comments were added: "When peer uses tiny windows, there is no use in packetizing to sub-MSS pieces for the sake of SWS or making sure there are enough packets in the pipe for fast recovery." The test should be > TCP_MSS_DEFAULT not >= 512. This allows low end devices that send an MSS of 536 (TCP_MSS_DEFAULT) to see better network performance by sending it 536 bytes of data at a time instead of bounding to half window size (268). Other network stacks work this way, e.g. HP-UX. Signed-off-by: Shane Seymour <shane.seymour@hpe.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/tcp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index a79894b66726..d825858fe4f1 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -589,7 +589,7 @@ static inline int tcp_bound_to_half_wnd(struct tcp_sock *tp, int pktsize)
* On the other hand, for extremely large MSS devices, handling
* smaller than MSS windows in this way does make sense.
*/
- if (tp->max_window >= 512)
+ if (tp->max_window > TCP_MSS_DEFAULT)
cutoff = (tp->max_window >> 1);
else
cutoff = tp->max_window;