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| author |   Vlad Yasevich <vladislav.yasevich@hp.com> | 2009-11-23 15:53:57 -0500 |
|---|---|---|
| committer | Vlad Yasevich <vladislav.yasevich@hp.com> | 2009-11-23 15:53:57 -0500 |
| commit | 90f2f5318b3a5b0898fef0fec9b91376c7de7a2c (patch) | |
| tree | 33622d2b9e2064c36c17cd108c9b3a23af1fd6a4 /include/net | |
| parent | sctp: Select a working primary during sctp_connectx() (diff) | |
| download | linux-dev-90f2f5318b3a5b0898fef0fec9b91376c7de7a2c.tar.xz linux-dev-90f2f5318b3a5b0898fef0fec9b91376c7de7a2c.zip | |
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')
| -rw-r--r-- | include/net/sctp/constants.h | 4 | ||||
| -rw-r--r-- | include/net/sctp/structs.h | 6 |
2 files changed, 10 insertions, 0 deletions
diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h index 58f714a3b670..63908840eef0 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 cd2e18778f81..90876b657775 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 { |