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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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13
net/sctp/sysctl.c
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@ -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 }
};