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sctp: Update SWS avaoidance receiver side algorithm

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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>
This commit is contained in:
Vlad Yasevich
2009-11-23 15:53:57 -05:00
parent e0e9db178a
commit 90f2f5318b
6 changed files with 30 additions and 4 deletions
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6
include/net/sctp/structs.h
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@@ -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 {