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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 /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 'net/sctp')
-rw-r--r--net/sctp/associola.c5
-rw-r--r--net/sctp/protocol.c3
-rw-r--r--net/sctp/sm_sideeffect.c3
-rw-r--r--net/sctp/sysctl.c13
4 files changed, 20 insertions, 4 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 8e755ebff3b..37e982510be 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -1383,8 +1383,9 @@ static inline int sctp_peer_needs_update(struct sctp_association *asoc)
case SCTP_STATE_SHUTDOWN_RECEIVED:
case SCTP_STATE_SHUTDOWN_SENT:
if ((asoc->rwnd > asoc->a_rwnd) &&
- ((asoc->rwnd - asoc->a_rwnd) >=
- min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pathmtu)))
+ ((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32,
+ (asoc->base.sk->sk_rcvbuf >> sctp_rwnd_upd_shift),
+ asoc->pathmtu)))
return 1;
break;
default:
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 08ef203d36a..a3c8988758b 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1258,6 +1258,9 @@ SCTP_STATIC __init int sctp_init(void)
/* Set SCOPE policy to enabled */
sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
+ /* Set the default rwnd update threshold */
+ sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
+
sctp_sysctl_register();
INIT_LIST_HEAD(&sctp_address_families);
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index eda4fe783be..8ae67098e09 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -217,8 +217,7 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
} else {
- if (asoc->a_rwnd > asoc->rwnd)
- asoc->a_rwnd = asoc->rwnd;
+ asoc->a_rwnd = asoc->rwnd;
sack = sctp_make_sack(asoc);
if (!sack)
goto nomem;
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index ab7151da120..ae03ded2bf1 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -52,6 +52,7 @@ static int int_max = INT_MAX;
static int sack_timer_min = 1;
static int sack_timer_max = 500;
static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
+static int rwnd_scale_max = 16;
extern int sysctl_sctp_mem[3];
extern int sysctl_sctp_rmem[3];
@@ -284,6 +285,18 @@ static ctl_table sctp_table[] = {
.extra1 = &zero,
.extra2 = &addr_scope_max,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "rwnd_update_shift",
+ .data = &sctp_rwnd_upd_shift,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &one,
+ .extra2 = &rwnd_scale_max,
+ },
+
{ .ctl_name = 0 }
};