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authorVlad Yasevich <vladislav.yasevich@hp.com>2009-11-23 15:53:57 -0500
committerVlad Yasevich <vladislav.yasevich@hp.com>2009-11-23 15:53:57 -0500
commit90f2f5318b3a5b0898fef0fec9b91376c7de7a2c (patch)
tree33622d2b9e2064c36c17cd108c9b3a23af1fd6a4 /include/net/sctp
parente0e9db178a5ba4dbb5f16f958f1affbdc63d2cc4 (diff)
sctp: Update SWS avaoidance receiver side algorithm
We currently send window update SACKs every time we free up 1 PMTU worth of data. That a lot more SACKs then necessary. Instead, we'll now send back the actuall window every time we send a sack, and do window-update SACKs when a fraction of the receive buffer has been opened. The fraction is controlled with a sysctl. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Diffstat (limited to 'include/net/sctp')
-rw-r--r--include/net/sctp/constants.h4
-rw-r--r--include/net/sctp/structs.h6
2 files changed, 10 insertions, 0 deletions
diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index 58f714a3b67..63908840eef 100644
--- a/include/net/sctp/constants.h
+++ b/include/net/sctp/constants.h
@@ -308,6 +308,10 @@ enum { SCTP_MAX_GABS = 16 };
#define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
#define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
+#define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of
+ * rcvbuf, which is 1/8 of initial
+ * window
+ */
#define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit
* to which we will raise the P-MTU.
*/
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index cd2e18778f8..90876b65777 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -231,6 +231,11 @@ extern struct sctp_globals {
/* Flag to indicate whether computing and verifying checksum
* is disabled. */
int checksum_disable;
+
+ /* Threshold for rwnd update SACKS. Receive buffer shifted this many
+ * bits is an indicator of when to send and window update SACK.
+ */
+ int rwnd_update_shift;
} sctp_globals;
#define sctp_rto_initial (sctp_globals.rto_initial)
@@ -267,6 +272,7 @@ extern struct sctp_globals {
#define sctp_prsctp_enable (sctp_globals.prsctp_enable)
#define sctp_auth_enable (sctp_globals.auth_enable)
#define sctp_checksum_disable (sctp_globals.checksum_disable)
+#define sctp_rwnd_upd_shift (sctp_globals.rwnd_update_shift)
/* SCTP Socket type: UDP or TCP style. */
typedef enum {